8-K

PERMIAN BASIN ROYALTY TRUST (PBT)

8-K 2021-06-01 For: 2021-05-27
View Original
Added on April 04, 2026

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENTREPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 27, 2021

PERMIAN BASIN ROYALTY TRUST

(Exact name of Registrant as specified in its charter)

Texas 1-8033 75-6280532
(State or other jurisdiction<br><br><br>of incorporation or organization) (Commission<br><br><br>File Number) (I.R.S. Employer<br><br><br>Identification No.)
Royalty Trust Management<br><br><br>Simmons Bank<br> <br>2911 TurtleCreek Boulevard<br> <br>Suite 850<br><br><br>Dallas, Texas 75219
--- ---
(Address of principal executive offices) (Zip Code)

Registrant’s Telephone Number, including area code: (855)588-7839

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2.):

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17<br>CFR 240.14a-12)
--- ---
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
--- ---
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
--- ---

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading<br><br><br>Symbol(s) Name of each exchange on which registered
Units of Beneficial Interest PBT New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Item 7.01. Regulation FD Disclosure.

On May 27, 2021, the Registrant published the Registrant’s full reserve report as of December 31, 2020 prepared by Cawley, Gillepsie & Associates, Inc., a summary of which was filed as an exhibit to the Registrant’s Form 10-K for the year ended December 31, 2020. The reserve report is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

This Report on Form 8-K is being furnished pursuant to Item 7.01, Regulation FD Disclosure. The information furnished is not deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, is not subject to the liabilities of that section and is not deemed incorporated by reference in any filing under the Securities Act of 1933, as amended.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits
23.1 Consent of Cawley, Gillespie & Associates, Inc.
--- ---
99.1 Report of Cawley, Gillespie & Associates, Inc.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

PERMIAN BASIN ROYALTY TRUST
By: SIMMONS BANK, TRUSTEE FOR PERMIAN BASIN ROYALTY TRUST
By: /s/ RON E. HOOPER
Ron E. Hooper
Senior Vice President

Date: June 1, 2021

EX-23.1

Exhibit 23.1

LOGO

CONSENT OF CAWLEY, GILLESPIE & ASSOCIATES, INC.

June 1, 2021

Permian Basin Royalty Trust

Simmons Bank

2911 Turtle Creek Boulevard, Suite 850

Dallas, Texas 75219

Gentlemen:

Cawley, Gillespie & Associates, Inc., hereby consents to the inclusion of the reserve reports dated February 2, 2021 in the Form 8-K filed by Permian Basin Royalty Trust with the Securities and Exchange Commission on the date hereof.

Submitted,
/s/ Cawley, Gillespie & Associates, Inc.
Cawley, Gillespie & Associates, Inc.
Texas Registered Engineering Firm F-693

EX-99.1

Exhibit 99.1

PERMIAN BASIN ROYALTY TRUST

WADDELL RANCH PROPERTIES

CRANE COUNTY, TEXAS

AND

TEXAS ROYALTYPROPERTIES

VARIOUS TEXAS COUNTIES

PERMIAN BASIN ROYALTY TRUST INTERESTS

PROVED RESERVES AND ECONOMIC FORECASTS

AS OF DECEMBER 31, 2020

PREPARED WITH SEC PRICE AND COST CRITERIA

VOLUME I OF II

LOGO

Texas Registered Engineering Firm F-693

PERMIAN BASIN ROYALTY TRUST

WADDELL RANCH PROPERTIES

CRANE COUNTY, TEXAS

AND

TEXAS ROYALTYPROPERTIES

VARIOUS TEXAS COUNTIES

PERMIAN BASIN ROYALTY TRUST INTERESTS

PROVED RESERVES AND ECONOMIC FORECASTS

AS OF DECEMBER 31, 2020

PREPARED WITH SEC PRICE AND COST CRITERIA

VOLUME I OF II

CAWLEY, GILLESPIE & ASSOCIATES, INC.
Petroleum Consultants
Texas Registered Engineering Firm F-693
KENNETH MUELLER, P.E. 86132
VICE PRESIDENT

WADDELL RANCH PROPERTIES AND TEXAS ROYALTY PROPERTIES

Permian Basin Royalty Trust Interests

As of December 31, 2020

Table of Contents

Volume I

Letter of Transmittal

Table of Contents

WADDELL RANCH PROPERTIES
Total Proved Reserves Table I – Total Proved
Summary Plot – Total Proved
One-Line Lease Reserves Summary Table II – Total Proved (8 pages)
Proved Developed Producing Reserves Table I – PDP
Summary Plot – Proved Developed Producing
One-Line Lease Reserves Summary Table II – PDP (7 pages)
Individual Lease Forecasts Graphs and Tables Tables 1 – 110
Proved Developed Non-ProducingReserves Table I – PDNP
Summary Plot – Proved Developed<br>Non-Producing
One-Line Lease Reserves Summary Table II – PDNP (1 page)
Individual Lease Forecasts Tables Tables 1 – 4
Proved Undeveloped Reserves Table I – PUD
Summary Plot – Proved Undeveloped
One-Line Lease Reserves Summary Table II – PUD (1 page)
Individual Lease Forecasts Tables Tables 1 – 9

Volume II

TEXAS ROYALTY PROPERTIES
Proved Reserves Table I - Proved
Summary Plot – Proved
One-Line Lease Reserves Summary Table II – Proved (10 pages)
Individual Lease Forecasts Graphs and Tables Tables 1 – 127
Appendix I
Waddell Ranch Properties Interest Computation Page 1
Texas Royalty Properties Interest Computation Page 2
Appendix II
--- ---
Explanatory Comments Page 1
Methods Employed in the Estimation of Reserves Page 2
Reserve Definitions and Classifications Pages 3-4

Exhibit 99.1

CAWLEY, GILLESPIE & ASSOCIATES, INC.

PETROLEUM CONSULTANTS
13640 BRIARWICK DRIVE, SUITE 100<br> <br>AUSTIN, TEXAS<br>78729-1707<br> <br>512-249-7000 306 WEST SEVENTH STREET, SUITE 302<br><br><br>FORT WORTH, TEXAS 76102-4987<br> <br>817- 336-2461<br> <br>www.cgaus. com 1000 LOUISIANA STREET, SUITE 1900<br><br><br>HOUSTON, TEXAS 77002-5008<br> <br>713-651-9944

February^^2,^^2021

Mr. Ron Hooper

Permian Basin Royalty Trust

2911 Turtle Creek Blvd., Suite 850

Dallas, Texas 75219

Re:  Evaluation Summary<br><br><br>Permian Basin Royalty Trust Interests Proved Reserves<br><br><br>As of December 31, 2020 Pursuant to the Rules and Regulations of the<br><br><br>Securities and Exchange Commission for<br> <br>ReportingCorporate Reserves and<br> <br>Future Net Revenue

Dear Mr. Hooper:

As requested, we are submitting this report of the estimates of proved reserves and economics forecasts attributable to the Permian Basin Royalty Trust interests effective as of December 31, 2020, completed February 2, 2021 for the purpose of reporting corporate reserves and future net revenue. This report has been prepared for the Permian Basin Royalty Trust pursuant to the rules, regulations and guidelines of the Securities and Exchange Commission, Item 1202 (a) (8) of Regulation S-K, for reporting corporate reserves and future net revenue. We reviewed 100 percent of the total proved reserves of the Permian Basin Royalty Trust in connection with the preparation of this report. The proved reserves presented in this report constitute 100 percent of the proved reserves owned by the Permian Basin Royalty Trust, all of which are located in the United States.

Composite reserve estimates and economic forecasts for the proved reserves are summarized below:

Texas RoyaltyProperties Waddell<br>Ranch Properties
Proved<br>Developed<br>Producing Proved<br>Developed<br>Producing Proved<br>Developed<br>Non-<br>Producing Proved<br>Undeveloped
Net Reserves
Oil/Condensate - Mbbl 4,450.8 2,980.1 766.0 89.4 615.3
Gas - MMcf 6,398.7 1,598.0 3,337.2 136.1 1,327.4
Net Revenue
Oil/Condensate - M 160,884.6 107,968.6 27,561.8 3,215.6 22,138.7
Gas - M 18,794.6 5,832.7 9,010.4 367.4 3,584.1
Severance Taxes - M 9,233.6 5,086.6 1,746.4 1,190.8 1,209.8
Operating Income (BFIT) - M 170,445.5 108,714.7 34,825.8 2,392.1 24,513.0
Discounted at 10% - M 80,091.5 **** 46,239.0 **** 23,216.1 **** 396.8 **** 10,239.5

All values are in US Dollars.

Mr. Ron Hooper

Permian Basin Royalty Trust Interests

February 2, 2021

Page 2

In accordance with the Securities and Exchange Commission guidelines, the future net cash flow, operating income (BFIT), has been discounted at an annual rate of 10% to determine its “present worth”. The discounted value, “present worth”, is indicative of the time value of money. The discounted value, “present worth”, shown above should not be construed to represent an estimate of the fair market value by Cawley, Gillespie & Associates, Inc.

The Permian Basin Royalty Trust consists of the Waddell Ranch Properties located in Crane County, Texas, and the Texas Royalty Properties located in various counties in Texas.

As to the assumptions, methods and procedures used in connection with the preparation of this report, prices were forecast in accordance with Securities and Exchange Commission rules and guidelines. The prices are determined as an unweighted arithmetic average of the first-day-of-the- month benchmark price for each month of 2020. The 12-month average benchmark Henry Hub spot gas price of $2.00 per MMBtu and 12-month average benchmark WTI Cushing spot oil price of $39.57 per barrel (source: Bloomberg) were used. The oil and gas prices were held constant throughout the life of the properties. The prices were adjusted for gravity, quality, heating value, shrinkage, transportation and marketing. For the Texas Royalty Properties, the gas and oil prices were adjusted using differentials of +$1.65 per Mcf and -$3.34 per barrel, respectively. For the Waddell Ranch Properties, the gas and oil prices were adjusted using differentials of +$0.70 per Mcf and -$3.59 per barrel, respectively. For the Texas Royalty Properties, the resulting oil and gas prices are $36.23 per barrel and $3.65 per MCF, respectively. For the Waddell Ranch Properties, the resulting oil and gas prices are $35.98 per barrel, and $2.70 per MCF, respectively.

For the Waddell Ranch Properties, operating expenses and capital costs were based on an analysis of data provided by ConocoPhillips. Operating expenses include direct lease operating expenses and administrative overhead. The operating expenses range from $3,309 per well per month to $5,500 per well per month. Investments include drilling costs, work-over costs, production equipment and facilities costs. No operating expense or capital cost data is available for the Texas Royalty Properties since they are purely a royalty interest only. Based on an analysis of the Permian Basin Royalty Trust Monthly reports, severance taxes were forecast as 4.61% and 5.28% of oil and gas revenue, respectively, for the Waddell Ranch Properties. For the Texas Royalty Properties, severance taxes were forecast as 4.36% and 6.50% of oil and gas revenue, respectively. The ad valorem taxes were forecast as 3.43% and 6.91% for the Waddell Ranch Properties and the Texas Royalty Properties, respectively. Neither expenses nor investments were escalated. The cost of plugging and the salvage value of equipment have not been considered.

The reserves were estimated using the production performance, volumetric or analogy methods, or a combination of these methods. In each case, we used the method or combination of methods that we considered appropriate and necessary to establish the reserves and conclusions presented. Riverhill Energy Corporation supplied the royalty production data for the Texas Royalty Properties. For these properties, the proved producing reserves are forecast using the production performance, decline analysis method to an estimated final production rate equal to approximately one-tenth of the current production rate. The producing reserves for the Waddell Ranch Properties were estimated using the production performance or analogy methods or a combination of these methods. The non-producing reserves were estimated using the analogy or volumetric methods or a combination of these methods.

Mr. Ron Hooper

Permian Basin Royalty Trust Interests

February 2, 2021

Page 3

The reserve classifications conform to the definitions and criteria of the Securities and Exchange Commission. The reserves and economics are predicated on the regulatory agency classifications, rules, policies, laws, taxes and royalties in effect on the effective date except as noted herein. The possible effects of changes in legislation or other Federal or State restrictive actions which could affect the reserves and economics have not been considered. We are not aware of any legislative changes or restrictive actions that may possibly impact the reserves or economics as presented. Possible environmental liability related to the properties has not been investigated nor considered. The assumptions, data, methods and procedures as described are appropriate for the purpose of this report. All reserve estimates represent our best judgment based on data available at the time of preparation and assumptions as to future economic and regulatory conditions. Due to the inherent uncertainties of reserves estimates, future production rates, commodity prices, costs and expenses, it should be realized that the reserves actually recovered, the revenue received and the actual cost incurred could be more or less than the estimated amounts.

The reserve estimates were based on interpretations of factual data furnished by ConocoPhillips, Riverhill Energy Corporation and the Permian Basin Royalty Trust. Liquid and gas price information, cost and expense history, subject wells and ownership were supplied by one or more of the above and were accepted as furnished. To some extent, information from public records has been used to check and/or supplement these data. The basic engineering and geological data were utilized subject to third party reservations and qualifications. Nothing has come to our attention, however, that would cause us to believe that we are not justified in relying on such data. An on-site inspection of these properties has not been made nor have the wells been tested by Cawley, Gillespie & Associates, Inc. We have used all methods and procedures that we consider necessary under the circumstances to prepare this report.

Cawley, Gillespie & Associates, Inc. is independent with respect to the Permian Basin Royalty Trust as provided in the Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserve Information promulgated by the Society of Petroleum Engineers. Neither Cawley, Gillespie & Associates, Inc. nor any of its employees has any interest in the subject properties. Neither the employment to make this study nor the compensation is contingent on the results of our work or the future performance of the subject properties. Cawley, Gillespie and Associates, Inc. is a Texas registered engineering firm, F-

693, of professional engineers and geologists serving the oil and gas industry for over fifty years. This report was prepared by, or under the supervision of, Kenneth J. Mueller, a Texas licensed professional

engineer, 86132.

Respectfully submitted,
CAWLEY, GILLESPIE & ASSOCIATES, INC.
Texas Registered Engineering Firm F-693
Kenneth J. Mueller, P.E. 86132
Vice President

Table I - Total Proved

Composite of Reserve Estimates and Economic Forecasts

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Total Proved Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross Oil<br>Production<br>MBBLS Gross Gas<br>Production<br>MMCF Net Oil<br>Production<br>MBBLS Net Gas<br>Sales<br>MMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 1,414.2 **** 6,373.4 **** -288.453 **** -353.629
**** 12-2022 **** 1,535.6 **** 5,959.2 **** 322.252 **** 1,028.530
**** 12-2023 **** 1,281.1 **** 4,651.4 **** 257.457 **** 809.750
**** 12-2024 **** 1,139.2 **** 4,170.3 **** 208.651 **** 641.752
**** 12-2025 **** 994.3 **** 3,597.7 **** 169.783 **** 505.304
**** 12-2026 **** 770.3 **** 2,518.9 **** 140.289 **** 406.816
**** 12-2027 **** 690.1 **** 2,237.9 **** 116.965 **** 330.301
**** 12-2028 **** 533.1 **** 1,623.8 **** 97.763 **** 270.150
**** 12-2029 **** 482.2 **** 1,451.3 **** 81.723 **** 221.348
**** 12-2030 **** 421.1 **** 1,220.5 **** 67.645 **** 180.058
**** 12-2031 **** 365.0 **** 1,004.3 **** 55.806 **** 146.927
**** 12-2032 **** 333.6 **** 916.3 **** 45.322 **** 117.897
**** 12-2033 **** 303.8 **** 828.0 **** 35.824 **** 91.756
**** 12-2034 **** 229.1 **** 581.4 **** 27.723 **** 70.934
**** 12-2035 **** 186.0 **** 485.5 **** 21.271 **** 54.652
**** S Tot **** 10,678.8 **** 37,619.7 **** 1,360.020 **** 4,522.544
**** After **** 771.4 **** 2,121.1 **** 110.687 **** 278.134
**** Total **** 11,450.2 **** 39,740.8 **** 1,470.708 **** 4,800.678
**** Cum **** 431,955.9 **** 1,353,590.4
**** Ult **** 443,406.2 **** 1,393,331.2

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 587.8 **** .0
**** 12-2022 **** 621.0 **** .0
**** 12-2023 **** 459.0 **** .0
**** 12-2024 **** 451.0 **** .0
**** 12-2025 **** 448.0 **** .0
**** 12-2026 **** 348.0 **** .0
**** 12-2027 **** 304.0 **** .0
**** 12-2028 **** 192.0 **** .0
**** 12-2029 **** 189.0 **** .0
**** 12-2030 **** 182.0 **** .0
**** 12-2031 **** 152.0 **** .0
**** 12-2032 **** 150.0 **** .0
**** 12-2033 **** 150.0 **** .0
**** 12-2034 **** 128.0 **** .0
**** 12-2035 **** 88.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

SEC 12-31-2020 Benchmark Prices Percent Cum. Disc.
WTI Spot Henry Hub 5.00 44,618.8
Year Oil $/STB Gas $/MMBTU 10.00 33,852.5
2021 39.57 2.00 **** 15.00 **** 26,456.2
Thereafter Flat Flat **** 20.00 **** 21,079.7
Cap 39.57 2.00 **** 25.00 **** 17,012.2
**** 30.00 **** 13,840.9

12 Months in first year

49.250 Year Life (04/2070)

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. 01/29/2021 16:31:21
TEXAS REGISTERED ENGINEERING FIRM F-693.

Summary

Cawley, Gillespie & Associates, Inc.

LOGO

Table II - Total Proved

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Total Proved Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

Current<br><br><br>Interest WellCnt<br><br><br>Life Ultimate<br><br><br>Recovery Gross<br><br><br>Reserves Net<br><br><br>Reserves Oil Revenue<br>Gas Revenue Prod Tax<br>Adv. Tax Expenses<br>Investments Future Net<br>Cash Flow Cash Flow<br>Disc.@ 10.0
LEASE NAME Start
Table Class Major Well No. Date ASN % MBBL / MMCF M / M M / M M / M M M
DUNE (GRAYBURG SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000 NI **** 79 **** 82,877.4 **** 0.0 **** 0.0
1 PDP Oil 1 37.5000 WI **** 0.0 **** 4,921.4 **** 0.0 **** 0.0
WADDELL WN TR 3 37.5000 NI **** 20 **** 20,686.4 **** 0.0 **** 0.0
2 PDP Oil 2 37.5000 WI **** 0.0 **** 11,024.2 **** 0.0 **** 0.0
UNIVERSITY-WADDELL (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000 NI **** 2 **** 2,185.4 **** 11.5 **** 0.4
3 PDP Oil 26 37.5000 WI **** 3.8 **** 5,524.7 **** 16.9 **** 0.6
WADDELL WN TR 3 37.5000 NI **** 36 **** 43,202.3 **** 910.0 **** 81.5
4 PDP Oil 27 37.5000 WI **** 13.4 **** 98,259.9 **** 1,645.3 **** 145.1
WADDELL (GRAYBURG SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000 NI **** 36 **** 74,275.0 **** 0.0 **** 0.0
5 PDP Oil 30 37.5000 WI **** 0.0 **** 31,962.9 **** 0.0 **** 0.0
WADDELL WN TR 3 0.0000 NI **** 36 **** 28.2 **** 0.0 **** 0.0
6 PDP Oil 32 37.5000 WI **** 0.0 **** 394.0 **** 0.0 **** 0.0
WADDELL (GRAYBURG) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000 NI **** 4 **** 96.8 **** 12.8 **** 0.8
7 PDP Oil 149 37.5000 WI **** 2.1 **** 717.2 **** 16.6 **** 1.0
SAND HILLS (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 2075 50.0000 NI **** 2 **** 448.8 **** 326.0 **** 82.1
8 PDP Oil 195 50.0000 WI **** 35.0 **** 1,271.8 **** 1,007.5 **** 252.9
WADDELL WN ETAL TR A 2076 50.0000 NI **** 1 **** 462.1 **** 378.8 **** 111.1
9 PDP Oil 196 50.0000 WI **** 49.2 **** 1,228.8 **** 1,005.0 **** 294.2
SAND HILLS (JUDKINS) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 146 **** 11,635.0 **** 166.6 **** 4.7
10 PDP Oil 4 50.0000 WI **** 1.6 **** 103,821.4 **** 1,791.6 **** 46.5
WADDELL WN ETAL TR A 0.0000 NI **** 146 **** 462.3 **** 0.0 **** 0.0
11 PDP Gas 5 50.0000 WI **** 0.0 **** 390,364.1 **** 0.0 **** 0.0
WADDELL WN ETAL TR A/C 0.0000 NI **** 146 **** 3.0 **** 0.0 **** 0.0
12 PDP Oil 169 50.0000 WI **** 0.0 **** 3.4 **** 0.0 **** 0.0
WADDELL WN ETAL TR C 0.0000 NI **** 146 **** 0.0 **** 0.0 **** 0.0
13 PDP Gas 6 50.0000 WI **** 0.0 **** 5,157.9 **** 0.0 **** 0.0
WADDELL WN ETAL TR I 0.0000 NI **** 146 **** 43.9 **** 0.0 **** 0.0
14 PDP Oil 7 40.6250 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
WADDELL WN ETAL TR I 40.6250 NI **** 11 **** 31.1 **** 0.0 **** 0.0
15 PDP Gas 8 40.6250 WI **** 0.0 **** 22,005.6 **** 0.0 **** 0.0
SAND HILLS (MCKNIGHT) — CRANE COUNTY, TEXAS
WADDELL W N 12.5000 NI **** 1 **** 326.9 **** 0.0 **** 0.0
16 PDP Oil 1 16 0.0000 WI **** 0.0 **** 189.0 **** 0.0 **** 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 105 **** 98,002.0 **** 860.3 **** 62.2
17 PDP Oil 11 50.0000 WI **** 6.9 **** 344,554.3 **** 3,680.5 **** 258.2
WADDELL WN ETAL TR A 0.0000 NI **** 105 **** 0.0 **** 0.0 **** 0.0
18 PDP Gas 12 50.0000 WI **** 0.0 **** 16,869.4 **** 0.0 **** 0.0
WADDELL WN ETAL TR A/C 50.0000 NI **** 5 **** 54.1 **** 1.9 **** 0.0
19 PDP Oil 168 50.0000 WI **** 0.3 **** 65.2 **** 2.3 **** 0.0
WADDELL WN ETAL TR C 50.0000 NI **** 1 **** 2,511.8 **** 10.5 **** 0.7
20 PDP Oil 13 50.0000 WI **** 6.8 **** 7,170.0 **** 2.3 **** 0.2

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:13 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  1

Table II - Total Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Total Proved Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

Current<br><br><br>Interest WellCnt<br><br><br>Life Ultimate<br><br><br>Recovery Gross<br><br><br>Reserves Net<br><br><br>Reserves Oil Revenue<br>Gas Revenue Prod Tax<br>Adv. Tax Expenses<br>Investments Future Net<br>Cash Flow Cash Flow<br>Disc.@ 10.0
LEASE NAME Start
Table Class Major Well No. Date ASN % MBBL / MMCF M / M M / M M / M M M
SAND HILLS (MCKNIGHT) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 2 **** 9.5 **** 0.0 **** 0.0
21 PDP Gas 14 40.6250 WI **** 0.0 **** 1,736.2 **** 0.0 **** 0.0
SAND HILLS (TUBB - SAN ANGELO) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR C 0.0000 NI **** 2 **** 2.2 **** 0.0 **** 0.0
22 PDP Oil 188 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
SAND HILLS (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 89 **** 41,267.1 **** 643.3 **** 35.3
23 PDP Oil 19 50.0000 WI **** 4.8 **** 94,021.7 **** 3,328.0 **** 175.0
WADDELL WN ETAL TR A 0.0000 NI **** 89 **** 0.0 **** 0.0 **** 0.0
24 PDP Gas 20 50.0000 WI **** 0.0 **** 4,368.6 **** 0.0 **** 0.0
WADDELL WN ETAL TR C 50.0000 NI **** 1 **** 1,878.9 **** 0.0 **** 0.0
25 PDP Oil 21 50.0000 WI **** 0.0 **** 407.3 **** 0.0 **** 0.0
WADDELL WN ETAL TR I 40.6250 NI **** 15 **** 2,647.1 **** 0.0 **** 0.0
26 PDP Oil 22 40.6250 WI **** 0.0 **** 5,882.0 **** 0.0 **** 0.0
WADDELL WN ETAL TR I 0.0000 NI **** 15 **** 0.0 **** 0.0 **** 0.0
27 PDP Gas 23 40.6250 WI **** 0.0 **** 4,145.4 **** 0.0 **** 0.0
WADDELL WN ETAL TR J 40.6250 NI **** 1 **** 641.2 **** 0.0 **** 0.0
28 PDP Oil 25 40.6250 WI **** 0.0 **** 296.1 **** 0.0 **** 0.0
BLOCK 31 NW (PENN UPPER) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 37.5000 NI **** 3 **** 1,155.0 **** 0.0 **** 0.0
29 PDP Oil 41 37.5000 WI **** 0.0 **** 1,059.1 **** 0.0 **** 0.0
WADDELL WN TR 4 0.0000 NI **** 3 **** 286.1 **** 0.0 **** 0.0
30 PDP Oil 42 37.5000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
DUNE (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 0.0000 NI **** 3 **** 0.0 **** 0.0 **** 0.0
31 PDP Gas 53 37.5000 WI **** 0.0 **** 896.9 **** 0.0 **** 0.0
WADDELL WN TR 3 37.5000 NI **** 1 **** 873.3 **** 0.0 **** 0.0
32 PDP Oil 54 37.5000 WI **** 0.0 **** 461.8 **** 0.0 **** 0.0
EDWARDS (GRAYBURG) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 0.0000 NI **** 1 **** 178.4 **** 0.0 **** 0.0
33 PDP Oil 56 37.5000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
RM (CLEARFORK) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR 1 0.0000 NI **** 1 **** 383.6 **** 0.0 **** 0.0
34 PDP Oil 120 37.5000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
UNIVERSITY WADDELL (GRAYBURG) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 37.5000 NI **** 1 **** 5.8 **** 0.0 **** 0.0
35 PDP Oil 185 37.5000 WI **** 0.0 **** 2.1 **** 0.0 **** 0.0
UNIVERSITY WADDELL (ELLENBURGER) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 0.0000 NI **** 1 **** 7.7 **** 0.0 **** 0.0
36 PDP Oil 166 37.5000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
UNIVERSITY WADDELL (PENN) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 37.5000 NI **** 1 **** 94.0 **** 0.0 **** 0.0
37 PDP Oil 97 37.5000 WI **** 0.0 **** 194.3 **** 0.0 **** 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:13 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  2

Table II - Total Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Total Proved Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

Current WellCnt Ultimate Gross Net Oil Revenue Prod Tax Expenses Future Net Cash Flow
LEASE NAME Start Interest Life Recovery Reserves Reserves Gas Revenue Adv. Tax Investments Cash Flow Disc.@ 10.0
Table Class Major Well No. Date ASN % MBBL / MMCF M / M M / M M / M M M
UNIVERSITY WADDELL (WADDELL SD) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR 3 37.5000 NI **** 1 **** 362.1 **** 115.3 **** 20.8
38 PDP Oil 102 37.5000 WI **** 30.2 **** 128.3 **** 17.3 **** 3.1
WADDELL (WICHITA ALBANY) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 37.5000 NI **** 1 **** 8.9 **** 0.0 **** 0.0
39 PDP Oil 193 37.5000 WI **** 0.0 **** 7.7 **** 0.0 **** 0.0
WADDELL (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000 NI **** 2 **** 195.0 **** 18.1 **** 1.0
40 PDP Oil 98 37.5000 WI **** 7.2 **** 410.9 **** 70.4 **** 3.9
WN WADDELL DPU 1233 18.7500 NI **** 1 **** 0.6 **** 0.0 **** 0.0
41 PDP Oil ERDU 197 18.7500 WI **** 0.0 **** 0.6 **** 0.0 **** 0.0
WADDELL (GRAYBURG) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 37.5000 NI **** 1 **** 3.7 **** 0.0 **** 0.0
42 PDP Gas 145 37.5000 WI **** 0.0 **** 33.1 **** 0.0 **** 0.0
WADDELL (GRAYBURG-QUEEN) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000 NI **** 20 **** 159.3 **** 0.0 **** 0.0
43 PDP Gas 99 37.5000 WI **** 0.0 **** 29,657.6 **** 0.0 **** 0.0
BLOCK 27 (MCKEE) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 2 **** 0.9 **** 0.0 **** 0.0
44 PDP Gas 39 50.0000 WI **** 0.0 **** 13,624.7 **** 0.0 **** 0.0
BLOCK B-21 (ELLENBURGER-TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 16.8 **** 4.3 **** 0.4
45 PDP Oil 183 50.0000 WI **** 4.4 **** 256.9 **** 78.0 **** 6.8
BLOCK B-21 (ELLENBURGER) — CRANE COUNTY, TEXAS
WADDELL WN ETAL 0.0000 NI **** 1 **** 874.5 **** 0.0 **** 0.0
46 PDP Oil 43 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
BLOCK B-21 (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000 NI **** 1 **** 330.2 **** 0.0 **** 0.0
47 PDP Oil 45 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
BLOCK B-27 (CONNELL) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000 NI **** 1 **** 3.4 **** 0.0 **** 0.0
48 PDP Oil 0357 137 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
C-BAR (SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000 NI **** 1 **** 656.6 **** 0.0 **** 0.0
49 PDP Oil 46 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
CORDONA LAKE (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 0.0000 NI **** 1 **** 646.9 **** 0.0 **** 0.0
50 PDP Oil 47 40.6250 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
CORDONA LAKE N (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 3 **** 1,070.6 **** 0.0 **** 0.0
51 PDP Oil 49 40.6250 WI **** 0.0 **** 3,849.1 **** 0.0 **** 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:13 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  3

Table II - Total Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Total Proved Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start CurrentInterest WellCntLife UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestemnts Future NetCash Flow Cash FlowDisc.@ 0.0
Table Class Major Well No. Date ASN % MBBL /MMCF M / M M / M M / M M M
CORDONA LAKE N (TUBB 4500) — CRANE COUNTY, TEXAS
WADDELL WNETAL TR I 0.0000 NI **** 3 **** 1,058.6 **** 0.0 **** 0.0
52 PDP Oil 48 40.6250 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
CORDONA LAKE SW (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 3 **** 590.8 **** 12.2 **** 0.4
53 PDP Oil 50 40.6250 WI **** 2.2 **** 1,084.2 **** 14.5 **** 0.5
CORDONA LAKE W (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 8 **** 1,784.4 **** 8.3 **** 0.2
54 PDP Oil 51 40.6250 WI **** 0.8 **** 8,636.3 **** 55.4 **** 1.0
CRAWAR (SAN ANDRES CONS) — CRANE COUNTY, TEXAS
WADDELL W N 9.2940 NI **** 1 **** 96.0 **** 0.0 **** 0.0
55 PDP Oil 1 94 0.0000 WI **** 0.0 **** 13.4 **** 0.0 **** 0.0
DELL (SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR E 50.0000 NI **** 1 **** 557.1 **** 0.6 **** 0.0
56 PDP Oil 52 50.0000 WI **** 0.3 **** 0.0 **** 0.0 **** 0.0
LEA (SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR H 50.0000 NI **** 1 **** 221.5 **** 0.0 **** 0.0
57 PDP Oil 57 50.0000 WI **** 0.0 **** 303.3 **** 0.0 **** 0.0
LEA SOUTH (CLEAR FORK) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR H 50.0000 NI **** 1 **** 482.7 **** 21.0 **** 2.4
58 PDP Oil 59 50.0000 WI **** 8.5 **** 1,356.4 **** 5.6 **** 0.6
LEA SOUTH (SAN ANGELO) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR H 50.0000 NI **** 4 **** 665.0 **** 5.2 **** 0.1
59 PDP Oil 61 50.0000 WI **** 0.8 **** 650.9 **** 2.6 **** 0.0
LEA SOUTH (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR H 0.0000 NI **** 4 **** 133.4 **** 0.0 **** 0.0
60 PDP Oil 62 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
MCKEE (CLEAR FORK LOWER) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 0.0000 NI **** 4 **** 218.3 **** 0.0 **** 0.0
61 PDP Oil 184 63 40.6250 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
MCKEE (CLEAR FORK) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 3 **** 2.6 **** 0.0 **** 0.0
62 PDP Gas 124 40.6250 WI **** 0.0 **** 2,346.6 **** 0.0 **** 0.0
MCKEE (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 1 **** 58.4 **** 0.0 **** 0.0
63 PDP Oil 64 40.6250 WI **** 0.0 **** 1,703.5 **** 0.0 **** 0.0
RUNNING W (JUDKINS) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000 NI **** 1 **** 0.0 **** 0.0 **** 0.0
64 PDP Gas 133 50.0000 WI **** 0.0 **** 193.4 **** 0.0 **** 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:13 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  4

Table II - Total Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Total Proved Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start CurrentInterest WellCntLife UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 0.0
Table Class Major Well No. Date ASN % MBBL / MMCF M / M M / M M / M M M
RUNNING W (JUDKINS) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000 NI **** 1 **** 6.1 **** 0.0 **** 0.0
65 PDP Oil 160 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
RUNNING W (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 9.2 **** 0.0 **** 0.0
66 PDP Gas 67 50.0000 WI **** 0.0 **** 352.1 **** 0.0 **** 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 5 **** 1,307.4 **** 0.0 **** 0.0
67 PDP Oil 69 50.0000 WI **** 0.0 **** 10,516.7 **** 0.0 **** 0.0
RUNNING W (WADDELL) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 13 **** 15,017.4 **** 21.9 **** 0.3
68 PDP Oil 73 50.0000 WI **** 1.4 **** 46,580.8 **** 152.1 **** 1.7
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0
69 PDP Gas 125 50.0000 WI **** 0.0 **** 101.5 **** 0.0 **** 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0
70 PDP Gas 126 50.0000 WI **** 0.0 **** 94.8 **** 0.0 **** 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0
71 PDP Gas 138 50.0000 WI **** 0.0 **** 1.5 **** 0.0 **** 0.0
RUNNING W (WICHITA ALBANY) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 104.8 **** 11.6 **** 1.9
72 PDP Gas 75 50.0000 WI **** 8.1 **** 3,166.2 **** 146.5 **** 23.3
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 72.2 **** 0.0 **** 0.0
73 PDP Oil 77 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0
74 PDP Gas 132 50.0000 WI **** 0.0 **** 391.3 **** 0.0 **** 0.0
RUNNING W NORTH (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 15.5 **** 0.0 **** 0.0
75 PDP Oil 184 50.0000 WI **** 0.0 **** 38.1 **** 0.0 **** 0.0
WADDELL WN ETAL TR D 50.0000 NI **** 1 **** 179.7 **** 44.6 **** 8.2
76 PDP Oil 78 50.0000 WI **** 15.6 **** 701.0 **** 146.7 **** 26.9
SAND HILLS (SAN ANGELO) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR C 50.0000 NI **** 1 **** 43.5 **** 5.0 **** 0.3
77 PDP Oil 173 50.0000 WI **** 2.7 **** 64.6 **** 5.4 **** 0.3
SAND HILLS (SAN ANGELO-MCKNIGHT) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 55.7 **** 18.9 **** 2.0
78 PDP Oil 174 50.0000 WI **** 8.9 **** 148.5 **** 39.4 **** 4.0
SAND HILLS (CLEARFORK) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 7 **** 182.8 **** 73.6 **** 8.4
79 PDP Oil 165 50.0000 WI **** 9.7 **** 4,411.8 **** 1,316.8 **** 148.4
SAND HILLS (ELLENBURGER) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 2 **** 753.5 **** 47.6 **** 7.0
80 PDP Oil 80 50.0000 WI **** 10.4 **** 1,023.2 **** 177.0 **** 25.7
SAND HILLS (ORDOVICIAN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL SEC 20 50.0000 NI **** 0 **** 1,909.2 **** 0.0 **** 0.0
81 PDP Oil 43 81 50.0000 WI **** 0.0 **** 1,352.7 **** 0.0 **** 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:13 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  5

Table II - Total Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Total Proved Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start<br>Date CurrentInterest WellCntLife UltimateRecovery GrossReserves NetReserves
Table Class Major Well No. ASN % MBBL / MMCF M / M M / M M / M M M
SAND HILLS (ORDOVICIAN) — CRANE COUNTY,<br>TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 1 **** 8,358.4 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
82 PDP Oil 82 40.6250 WI **** 0.0 **** 7,241.0 **** 0.0 **** 0.0 0.0 0.0 0.0
SAND HILLS (SAN ANGELO UPPER) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000 NI **** 1 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
83 PDP Gas 86 50.0000 WI **** 0.0 **** 8,743.9 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 41 **** 4,926.4 **** 295.2 **** 18.7 671.9 47.7 0.0 941.6 810.3
84 PDP Oil 85 50.0000 WI **** 5.1 **** 22,120.1 **** 1,925.8 **** 117.6 317.5 0.0 0.0
SAND HILLS (WICHITA ALBANY) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 10 **** 343.8 **** 56.0 **** 3.9 139.3 10.7 0.0 210.2 184.0
85 PDP Gas 87 50.0000 WI **** 4.7 **** 5,946.3 **** 451.2 **** 30.2 81.7 0.0 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 425.3 **** 12.3 **** 1.4 49.8 2.6 0.0 53.6 46.1
86 PDP Oil 103 50.0000 WI **** 5.5 **** 2,983.5 **** 21.5 **** 2.4 6.4 0.0 0.0
SAND HILLS (WOJCIK-MCELROY) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 10 **** 8.9 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
87 PDP Gas 114 50.0000 WI **** 0.0 **** 5,083.4 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL WN ETAL TR C 50.0000 NI **** 3 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
88 PDP Gas 140 50.0000 WI **** 0.0 **** 1,111.3 **** 0.0 **** 0.0 0.0 0.0 0.0
SAND HILLS (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 14 **** 2,197.5 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
89 PDP Oil 88 50.0000 WI **** 0.0 **** 4,765.4 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
90 PDP Gas 95 50.0000 WI **** 0.0 **** 5,669.6 **** 0.0 **** 0.0 0.0 0.0 0.0
SAND HILLS EAST (ELLENBURGER) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 2 **** 617.8 **** 20.1 **** 1.4 49.2 2.5 0.0 51.6 44.3
91 PDP Oil 89 50.0000 WI **** 5.2 **** 550.7 **** 27.6 **** 1.8 4.9 0.0 0.0
SAND HILLS S (HOLT) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 0.0000 NI **** 2 **** 157.8 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
92 PDP Oil 92 40.6250 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
SAND HILLS WEST (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 3 **** 12.6 **** 0.6 **** 0.0 0.4 0.3 0.0 4.8 4.6
93 PDP Oil 167 50.0000 WI **** 1.4 **** 806.3 **** 96.5 **** 1.7 4.6 0.0 0.0
SIMPSON (ELLENBURGER-TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 2.1 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
94 PDP Oil 190 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL (MCKNIGHT) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 6 **** 323.2 **** 98.0 **** 15.7 564.4 36.0 0.0 717.1 600.0
95 PDP Oil 179 50.0000 WI **** 7.0 **** 1,008.8 **** 441.2 **** 69.9 188.8 0.0 0.0
WADDELL (MCKNIGHT-TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 2044 50.0000 NI **** 1 **** 7.5 **** 5.4 **** 0.5 18.9 1.3 0.0 25.6 23.4
96 PDP Oil 198 50.0000 WI **** 3.2 **** 37.7 **** 31.2 **** 3.0 8.0 0.0 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:13 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  6

Table II - Total Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Total Proved Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start<br>Date CurrentInterest WellCntLife UltimateRecovery GrossReserves NetReserves
Table Class Major Well No. ASN % MBBL / MMCF M / M M / M M / M M M
WADDELL (MCKN-TUBB-WA-WC) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 3 **** 282.4 **** 127.9 **** 27.5 989.5 94.0 0.0 1,811.8 1,157.6
97 PDP Oil 189 50.0000 WI **** 19.2 **** 3,458.3 **** 1,586.8 **** 339.4 916.4 0.0 0.0
WADDELL (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN TR A 50.0000 NI **** 1 **** 27.7 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
98 PDP Gas 194 50.0000 WI **** 0.0 **** 369.2 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL (TUBB-S<br>ANGELO-MCKN) — CRANE COUNTY, TEXAS
WADDELL WN TR A 50.0000 NI **** 3 **** 218.8 **** 92.7 **** 14.8 530.8 37.1 0.0 732.8 515.1
99 PDP Gas 177 50.0000 WI **** 16.2 **** 1,446.1 **** 561.8 **** 88.6 239.1 0.0 0.0
WADDELL (WICHITA ALBANY) — CRANE COUNTY,<br>TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 95.7 **** 26.3 **** 5.0 181.5 12.0 0.0 239.2 189.5
100 PDP Oil 182 50.0000 WI **** 9.8 **** 783.1 **** 135.5 **** 25.8 69.7 0.0 0.0
WADDELL (WICHITA<br>ALB-WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 6 **** 839.2 **** 576.6 **** 125.9 4,530.2 283.9 0.0 5,667.5 3,072.2
101 PDP Gas 181 50.0000 WI **** 32.2 **** 4,152.8 **** 2,422.8 **** 526.3 1,421.1 0.0 0.0
WADDELL (WOLFCAMP-TUBB-SA-MCK) — CRANE COUNTY, TEXAS
WADDELL WN TR A 50.0000 NI **** 3 **** 243.2 **** 65.0 **** 13.5 484.5 37.2 0.0 728.9 587.7
102 PDP Oil 175 50.0000 WI **** 8.4 **** 1,438.0 **** 506.4 **** 104.3 281.7 0.0 0.0
WADDELL<br>(WOLF-TUBB-S ANG-MCKN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 36.1 **** 6.3 **** 0.7 26.6 3.6 0.0 68.3 55.5
103 PDP Gas 180 50.0000 WI **** 7.4 **** 439.3 **** 144.7 **** 16.8 45.3 0.0 0.0
WADDELL (WOLF-WICHITA A-TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000 NI **** 0 **** 43.8 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
104 PDP Oil 178 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL RANCH (JUDKINS) — CRANE COUNTY,<br>TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 2 **** 8.4 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
105 PDP Oil 191 50.0000 WI **** 0.0 **** 142.4 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL RANCH (MCKNIGHT) — CRANE COUNTY,<br>TEXAS
WADDELL WN ETAL TR C 50.0000 NI **** 1 **** 47.4 **** 20.8 **** 2.7 98.9 5.2 0.0 105.5 85.4
106 PDP Oil 192 50.0000 WI **** 8.5 **** 70.3 **** 33.5 **** 4.4 11.8 0.0 0.0
WADDELL RANCH (SAN ANGELO) — CRANE COUNTY,<br>TEXAS
WADDELL WN TR A 50.0000 NI **** 6 **** 236.3 **** 81.5 **** 8.5 305.0 24.6 0.0 479.7 376.6
107 PDP Oil 176 50.0000 WI **** 9.2 **** 1,749.5 **** 722.3 **** 73.8 199.3 0.0 0.0
WADDELL WEST<br>(MCELROY-SAN ANGELO) — CRANE COUNTY, TEXAS
WADDELL WN TR A 0.0000 NI **** 1 **** 4.2 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
108 PDP Oil 170 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL WEST<br>(TUBB-S ANGELO-MCKN) — CRANE COUNTY, TEXAS
WADDELL WN TR A 50.0000 NI **** 22 **** 1,572.4 **** 609.1 **** 93.7 3,371.4 228.3 0.0 4,523.4 3,290.0
109 PDP Oil 171 50.0000 WI **** 12.9 **** 8,484.9 **** 3,357.1 **** 511.2 1,380.3 0.0 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:13 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  7

Table II - Total Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Total Proved Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start<br>Date CurrentInterest WellCntLife UltimateRecovery GrossReserves NetReserves
Table Class Major Well No. ASN % MBBL / MMCF M / M M / M M / M M M
Y SOUTH (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 0 **** 125.2 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
110 PDP Oil 620 101 40.6250WI **** 0.0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
SAND HILLS (SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
111 PDNP Oil 01/21 163 50.0000 WI **** 0.9 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 319.3 **** 319.3 **** 89.4 3,215.6 167.6 0.0 3,415.3 1,372.6
112 PDNP Oil 02/21 17 50.0000 WI **** 40.8 **** 550.8 **** 550.8 **** 136.1 367.4 0.0 0.0
WADDELL (GRAYBURG SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN EAST RANCH 37.5000 NI **** 0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
113 PDNP Oil 01/21 108 37.5000 WI **** 0.9 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
SAND HILLS (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL WEST 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
114 PDNP Oil 01/21 109 50.0000 WI **** 0.9 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 13 **** 317.7 **** 317.7 **** 31.7 1,139.0 63.0 0.0 1,274.0 824.1
115 PUD Oil 02/21 29 50.0000 WI **** 9.4 **** 752.7 **** 752.7 **** 73.3 198.0 0.0 0.0
SAND HILLS — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 4 **** 177.0 **** 177.0 **** 16.4 590.2 32.8 0.0 664.1 326.5
116 PUD Oil 11/21 141 40.6250 WI **** 13.1 **** 433.7 **** 433.7 **** 39.5 106.8 0.0 0.0
SAND HILLS (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 64 **** 4,101.7 **** 4,101.7 **** 463.9 16,689.4 921.1 0.0 18,640.9 7,089.1
117 PUD Oil 02/21 58 50.0000 WI **** 16.1 **** 9,721.7 **** 9,721.7 **** 1,063.9 2,872.5 0.0 0.0
WADDELL (GRAYBURG SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000 NI **** 2 **** 214.9 **** 214.9 **** 33.7 1,211.3 60.6 0.0 1,241.1 577.4
118 PUD Oil 03/21 147 37.5000 WI **** 27.7 **** 214.9 **** 214.9 **** 33.5 90.4 0.0 0.0
WADDELL WN TR 3 37.5000 NI **** 2 **** 214.9 **** 214.9 **** 33.7 1,211.3 60.6 0.0 1,241.1 577.4
119 PUD Oil 03/21 83 37.5000 WI **** 27.7 **** 214.9 **** 214.9 **** 33.5 90.4 0.0 0.0
SAND HILLS — CRANE COUNTY, TEXAS
WADDELL WN ETAL WEST 50.0000 NI **** 3 **** 82.2 **** 82.2 **** 13.2 474.7 26.5 0.0 534.8 414.7
120 PUD Oil 02/21 162 50.0000 WI **** 9.5 **** 201.3 **** 201.3 **** 32.0 86.5 0.0 0.0
SAND HILLS (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR AB 25.0000 NI **** 1 **** 66.2 **** 66.2 **** 4.7 170.2 9.4 0.0 189.8 94.1
121 PUD Oil 06/21 60 25.0000 WI **** 15.9 **** 153.9 **** 153.9 **** 10.7 29.0 0.0 0.0
WADDELL WN ETAL TR H 50.0000 NI **** 1 **** 66.2 **** 66.2 **** 9.1 326.4 18.0 0.0 363.8 167.6
122 PUD Oil 10/21 70 50.0000 WI **** 15.9 **** 153.9 **** 153.9 **** 20.5 55.4 0.0 0.0
WADDELL WN ETAL TR D 50.0000 NI **** 1 **** 66.2 **** 66.2 **** 9.1 326.2 18.0 0.0 363.4 168.7
123 PUD Oil 09/21 18 50.0000 WI **** 15.9 **** 153.5 **** 153.5 **** 20.4 55.2 0.0 0.0
GRAND TOTAL **** 1744 **** 443,406.2 **** 11,450.2 **** 1,470.7 52,916.1 4,147.0 0.0 61,730.9 33,852.5
**** 1,393,331.6 **** 39,740.9 **** 4,800.7 12,961.8 0.0 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:13 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  8

Table I - PDP

Composite of Reserve Estimates and Economic Forecasts

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net Gas<br>Sales Avg OilPrice Avg GasPrice Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 143.868
**** 12-2022 **** 113.647
**** 12-2023 **** 90.970
**** 12-2024 **** 72.272
**** 12-2025 **** 56.041
**** 12-2026 **** 44.223
**** 12-2027 **** 35.354
**** 12-2028 **** 28.886
**** 12-2029 **** 24.319
**** 12-2030 **** 20.504
**** 12-2031 **** 17.272
**** 12-2032 **** 14.405
**** 12-2033 **** 11.774
**** 12-2034 **** 9.867
**** 12-2035 **** 8.905
**** S Tot **** 692.308
**** After **** 73.722
**** Total **** 766.030
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End ProductionTaxes Ad ValoremTaxes Wells<br><br><br>Gross        Net OperatingExpense OtherDeductions Investment Future NetCash Flow CumulativeCash Flow Cum. Cash Flow<br>Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 548.0 .0
**** 12-2022 **** 530.0 .0
**** 12-2023 **** 368.0 .0
**** 12-2024 **** 360.0 .0
**** 12-2025 **** 357.0 .0
**** 12-2026 **** 257.0 .0
**** 12-2027 **** 213.0 .0
**** 12-2028 **** 101.0 .0
**** 12-2029 **** 98.0 .0
**** 12-2030 **** 91.0 .0
**** 12-2031 **** 77.0 .0
**** 12-2032 **** 75.0 .0
**** 12-2033 **** 75.0 .0
**** 12-2034 **** 53.0 .0
**** 12-2035 **** 17.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

SEC 12-31-2020 Benchmark Prices
WTI Spot Henry Hub
Year Oil $/STB Gas $/MMBTU
2021 39.57 2.00
Thereafter Flat Flat
Cap 39.57 2.00
Percent Cum. Disc.
--- --- --- ---
**** 5.00 **** 27,561.6
**** 10.00 **** 23,216.1
**** 15.00 **** 20,271.6
**** 20.00 **** 18,118.8
**** 25.00 **** 16,463.8
**** 30.00 **** 15,145.8

12 Months in first year

49.250 Year Life (04/2070)

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. 01/29/2021    16:31:26
TEXAS REGISTERED ENGINEERING FIRM F-693.
Summary

Cawley, Gillespie & Associates, Inc.

LOGO

Table II - PDP

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

Current<br><br><br>Interest WellCnt<br><br><br>Life Ultimate<br><br><br>Recovery Gross<br><br><br>Reserves Net<br><br><br>Reserves Oil Revenue<br>Gas Revenue Prod Tax<br>Adv. Tax Expenses<br>Investments Future Net<br>Cash Flow Cash Flow<br>Disc.@ 10.0
LEASE NAME Start
Table Class Major Well No. Date ASN % MBBL / MMCF M / M M / M M / M M M
DUNE (GRAYBURG SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000  NI **** 79 **** 82,877.4 **** 0.0 **** 0.0
1 PDP Oil 1 37.5000 WI **** 0.0 **** 4,921.4 **** 0.0 **** 0.0
WADDELL WN TR 3 37.5000  NI **** 20 **** 20,686.4 **** 0.0 **** 0.0
2 PDP Oil 2 37.5000 WI **** 0.0 **** 11,024.2 **** 0.0 **** 0.0
UNIVERSITY-WADDELL (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000  NI **** 2 **** 2,185.4 **** 11.5 **** 0.4
3 PDP Oil 26 37.5000 WI **** 3.8 **** 5,524.7 **** 16.9 **** 0.6
WADDELL WN TR 3 37.5000  NI **** 36 **** 43,202.3 **** 910.0 **** 81.5
4 PDP Oil 27 37.5000 WI **** 13.4 **** 98,259.9 **** 1,645.3 **** 145.1
WADDELL (GRAYBURG SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000  NI **** 36 **** 74,275.0 **** 0.0 **** 0.0
5 PDP Oil 30 37.5000 WI **** 0.0 **** 31,962.9 **** 0.0 **** 0.0
WADDELL WN TR 3 0.0000  NI **** 36 **** 28.2 **** 0.0 **** 0.0
6 PDP Oil 32 37.5000 WI **** 0.0 **** 394.0 **** 0.0 **** 0.0
WADDELL (GRAYBURG) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000  NI **** 4 **** 96.8 **** 12.8 **** 0.8
7 PDP Oil 149 37.5000 WI **** 2.1 **** 717.2 **** 16.6 **** 1.0
SAND HILLS (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 2075 50.0000  NI **** 2 **** 448.8 **** 326.0 **** 82.1
8 PDP Oil 195 50.0000 WI **** 35.0 **** 1,271.8 **** 1,007.5 **** 252.9
WADDELL WN ETAL TR A 2076 50.0000  NI **** 1 **** 462.1 **** 378.8 **** 111.1
9 PDP Oil 196 50.0000 WI **** 49.2 **** 1,228.8 **** 1,005.0 **** 294.2
SAND HILLS (JUDKINS) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000  NI **** 146 **** 11,635.0 **** 166.6 **** 4.7
10 PDP Oil 4 50.0000 WI **** 1.6 **** 103,821.4 **** 1,791.6 **** 46.5
WADDELL WN ETAL TR A 0.0000  NI **** 146 **** 462.3 **** 0.0 **** 0.0
11 PDP Gas 5 50.0000 WI **** 0.0 **** 390,364.1 **** 0.0 **** 0.0
WADDELL WN ETAL TR A/C 0.0000  NI **** 146 **** 3.0 **** 0.0 **** 0.0
12 PDP Oil 169 50.0000 WI **** 0.0 **** 3.4 **** 0.0 **** 0.0
WADDELL WN ETAL TR C 0.0000  NI **** 146 **** 0.0 **** 0.0 **** 0.0
13 PDP Gas 6 50.0000 WI **** 0.0 **** 5,157.9 **** 0.0 **** 0.0
WADDELL WN ETAL TR I 0.0000  NI **** 146 **** 43.9 **** 0.0 **** 0.0
14 PDP Oil 7 40.6250 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
WADDELL WN ETAL TR I 40.6250  NI **** 11 **** 31.1 **** 0.0 **** 0.0
15 PDP Gas 8 40.6250 WI **** 0.0 **** 22,005.6 **** 0.0 **** 0.0
SAND HILLS (MCKNIGHT) — CRANE COUNTY, TEXAS
WADDELL W N 12.5000  NI **** 1 **** 326.9 **** 0.0 **** 0.0
16 PDP Oil 1 16 0.0000 WI **** 0.0 **** 189.0 **** 0.0 **** 0.0
WADDELL WN ETAL TR A 50.0000  NI **** 105 **** 98,002.0 **** 860.3 **** 62.2
17 PDP Oil 11 50.0000 WI **** 6.9 **** 344,554.3 **** 3,680.5 **** 258.2
WADDELL WN ETAL TR A 0.0000  NI **** 105 **** 0.0 **** 0.0 **** 0.0
18 PDP Gas 12 50.0000 WI **** 0.0 **** 16,869.4 **** 0.0 **** 0.0
WADDELL WN ETAL TR A/C 50.0000  NI **** 5 **** 54.1 **** 1.9 **** 0.0
19 PDP Oil 168 50.0000 WI **** 0.3 **** 65.2 **** 2.3 **** 0.0
WADDELL WN ETAL TR C 50.0000  NI **** 1 **** 2,511.8 **** 10.5 **** 0.7
20 PDP Oil 13 50.0000 WI **** 6.8 **** 7,170.0 **** 2.3 **** 0.2

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:14 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  1

Table II - PDP (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

Current<br><br><br>Interest WellCnt<br><br><br>Life Ultimate<br><br><br>Recovery Gross<br><br><br>Reserves Net<br><br><br>Reserves Oil Revenue<br>Gas Revenue Prod Tax<br>Adv. Tax Expenses<br>Investments Future Net<br>Cash Flow Cash Flow<br>Disc.@ 10.0
LEASE NAME Start
Table Class Major Well No. Date ASN % MBBL / MMCF M / M M / M M / M M M
SAND HILLS (MCKNIGHT) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250  NI **** 2 **** 9.5 **** 0.0 **** 0.0
21 PDP Gas 14 40.6250 WI **** 0.0 **** 1,736.2 **** 0.0 **** 0.0
SAND HILLS (TUBB - SAN ANGELO) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR C 0.0000  NI **** 2 **** 2.2 **** 0.0 **** 0.0
22 PDP Oil 188 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
SAND HILLS (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000  NI **** 89 **** 41,267.1 **** 643.3 **** 35.3
23 PDP Oil 19 50.0000 WI **** 4.8 **** 94,021.7 **** 3,328.0 **** 175.0
WADDELL WN ETAL TR A 0.0000  NI **** 89 **** 0.0 **** 0.0 **** 0.0
24 PDP Gas 20 50.0000 WI **** 0.0 **** 4,368.6 **** 0.0 **** 0.0
WADDELL WN ETAL TR C 50.0000  NI **** 1 **** 1,878.9 **** 0.0 **** 0.0
25 PDP Oil 21 50.0000 WI **** 0.0 **** 407.3 **** 0.0 **** 0.0
WADDELL WN ETAL TR I 40.6250  NI **** 15 **** 2,647.1 **** 0.0 **** 0.0
26 PDP Oil 22 40.6250 WI **** 0.0 **** 5,882.0 **** 0.0 **** 0.0
WADDELL WN ETAL TR I 0.0000  NI **** 15 **** 0.0 **** 0.0 **** 0.0
27 PDP Gas 23 40.6250 WI **** 0.0 **** 4,145.4 **** 0.0 **** 0.0
WADDELL WN ETAL TR J 40.6250  NI **** 1 **** 641.2 **** 0.0 **** 0.0
28 PDP Oil 25 40.6250 WI **** 0.0 **** 296.1 **** 0.0 **** 0.0
BLOCK 31 NW (PENN UPPER) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 37.5000  NI **** 3 **** 1,155.0 **** 0.0 **** 0.0
29 PDP Oil 41 37.5000 WI **** 0.0 **** 1,059.1 **** 0.0 **** 0.0
WADDELL WN TR 4 0.0000  NI **** 3 **** 286.1 **** 0.0 **** 0.0
30 PDP Oil 42 37.5000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
DUNE (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 0.0000  NI **** 3 **** 0.0 **** 0.0 **** 0.0
31 PDP Gas 53 37.5000 WI **** 0.0 **** 896.9 **** 0.0 **** 0.0
WADDELL WN TR 3 37.5000  NI **** 1 **** 873.3 **** 0.0 **** 0.0
32 PDP Oil 54 37.5000 WI **** 0.0 **** 461.8 **** 0.0 **** 0.0
EDWARDS (GRAYBURG) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 0.0000  NI **** 1 **** 178.4 **** 0.0 **** 0.0
33 PDP Oil 56 37.5000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
RM (CLEARFORK) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR 1 0.0000  NI **** 1 **** 383.6 **** 0.0 **** 0.0
34 PDP Oil 120 37.5000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
UNIVERSITY WADDELL (GRAYBURG) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 37.5000  NI **** 1 **** 5.8 **** 0.0 **** 0.0
35 PDP Oil 185 37.5000 WI **** 0.0 **** 2.1 **** 0.0 **** 0.0
UNIVERSITY WADDELL (ELLENBURGER) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 0.0000  NI **** 1 **** 7.7 **** 0.0 **** 0.0
36 PDP Oil 166 37.5000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
UNIVERSITY WADDELL (PENN) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 37.5000  NI **** 1 **** 94.0 **** 0.0 **** 0.0
37 PDP Oil 97 37.5000 WI **** 0.0 **** 194.3 **** 0.0 **** 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:14 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  2

Table II - PDP (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

Current WellCnt Ultimate Gross Net Oil Revenue Prod Tax Expenses Future Net Cash Flow
LEASE NAME Start Interest Life Recovery Reserves Reserves Gas Revenue Adv. Tax Investments Cash Flow Disc.@ 10.0
Table Class Major Well No. Date ASN % MBBL / MMCF M / M M / M M / M M M
UNIVERSITY WADDELL (WADDELL SD) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR 3 37.5000  NI **** 1 **** 362.1 **** 115.3 **** 20.8
38 PDP Oil 102 37.5000 WI **** 30.2 **** 128.3 **** 17.3 **** 3.1
WADDELL (WICHITA ALBANY) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 37.5000  NI **** 1 **** 8.9 **** 0.0 **** 0.0
39 PDP Oil 193 37.5000 WI **** 0.0 **** 7.7 **** 0.0 **** 0.0
WADDELL (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000  NI **** 2 **** 195.0 **** 18.1 **** 1.0
40 PDP Oil 98 37.5000 WI **** 7.2 **** 410.9 **** 70.4 **** 3.9
WN WADDELL DPU 1233 18.7500  NI **** 1 **** 0.6 **** 0.0 **** 0.0
41 PDP Oil ERDU 197 18.7500 WI **** 0.0 **** 0.6 **** 0.0 **** 0.0
WADDELL (GRAYBURG) — CRANE COUNTY, TEXAS
WADDELL WN TR 3 37.5000  NI **** 1 **** 3.7 **** 0.0 **** 0.0
42 PDP Gas 145 37.5000 WI **** 0.0 **** 33.1 **** 0.0 **** 0.0
WADDELL (GRAYBURG-QUEEN) —CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000  NI **** 20 **** 159.3 **** 0.0 **** 0.0
43 PDP Gas 99 37.5000 WI **** 0.0 **** 29,657.6 **** 0.0 **** 0.0
BLOCK 27 (MCKEE) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000  NI **** 2 **** 0.9 **** 0.0 **** 0.0
44 PDP Gas 39 50.0000 WI **** 0.0 **** 13,624.7 **** 0.0 **** 0.0
BLOCK B-21 (ELLENBURGER-TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000  NI **** 1 **** 16.8 **** 4.3 **** 0.4
45 PDP Oil 183 50.0000 WI **** 4.4 **** 256.9 **** 78.0 **** 6.8
BLOCK B-21 (ELLENBURGER) — CRANE COUNTY, TEXAS
WADDELL WN ETAL 0.0000  NI **** 1 **** 874.5 **** 0.0 **** 0.0
46 PDP Oil 43 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
BLOCK B-21 (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000  NI **** 1 **** 330.2 **** 0.0 **** 0.0
47 PDP Oil 45 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
BLOCK B-27 (CONNELL) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000  NI **** 1 **** 3.4 **** 0.0 **** 0.0
48 PDP Oil 0357 137 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
C-BAR (SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000  NI **** 1 **** 656.6 **** 0.0 **** 0.0
49 PDP Oil 46 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
CORDONA LAKE (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 0.0000  NI **** 1 **** 646.9 **** 0.0 **** 0.0
50 PDP Oil 47 40.6250 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
CORDONA LAKE N (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250  NI **** 3 **** 1,070.6 **** 0.0 **** 0.0
51 PDP Oil 49 40.6250 WI **** 0.0 **** 3,849.1 **** 0.0 **** 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:14 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  3

Table II - PDP (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start<br>Date CurrentInterest WellCntLife UltimateRecovery GrossReserves NetReserves
Table Class Major Well No. ASN % MBBL / MMCF M / M M / M M / M M M
CORDONA LAKE N (TUBB 4500) — CRANE COUNTY,<br>TEXAS
WADDELL WN ETAL TR I 0.0000 NI **** 3 **** 1,058.6 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
52 PDP Oil 48 40.6250 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
CORDONA LAKE SW (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 3 **** 590.8 **** 12.2 **** 0.4 15.3 0.8 0.0 15.9 14.8
53 PDP Oil 50 40.6250 WI **** 2.2 **** 1,084.2 **** 14.5 **** 0.5 1.3 0.0 0.0
CORDONA LAKE W (DEVONIAN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 8 **** 1,784.4 **** 8.3 **** 0.2 6.2 0.4 0.0 8.5 8.3
54 PDP Oil 51 40.6250 WI **** 0.8 **** 8,636.3 **** 55.4 **** 1.0 2.8 0.0 0.0
CRAWAR (SAN ANDRES CONS) — CRANE COUNTY,<br>TEXAS
WADDELL W N 9.2940 NI **** 1 **** 96.0 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
55 PDP Oil 1 94 0.0000 WI **** 0.0 **** 13.4 **** 0.0 **** 0.0 0.0 0.0 0.0
DELL (SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR E 50.0000 NI **** 1 **** 557.1 **** 0.6 **** 0.0 0.1 0.0 0.0 0.1 0.1
56 PDP Oil 52 50.0000 WI **** 0.3 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
LEA (SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR H 50.0000 NI **** 1 **** 221.5 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
57 PDP Oil 57 50.0000 WI **** 0.0 **** 303.3 **** 0.0 **** 0.0 0.0 0.0 0.0
LEA SOUTH (CLEAR FORK) — CRANE COUNTY,<br>TEXAS
WADDELL WN ETAL TR H 50.0000 NI **** 1 **** 482.7 **** 21.0 **** 2.4 84.7 4.0 0.0 82.4 65.1
58 PDP Oil 59 50.0000 WI **** 8.5 **** 1,356.4 **** 5.6 **** 0.6 1.7 0.0 0.0
LEA SOUTH (SAN ANGELO) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR H 50.0000 NI **** 4 **** 665.0 **** 5.2 **** 0.1 2.4 0.1 0.0 2.3 2.3
59 PDP Oil 61 50.0000 WI **** 0.8 **** 650.9 **** 2.6 **** 0.0 0.1 0.0 0.0
LEA SOUTH (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR H 0.0000 NI **** 4 **** 133.4 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
60 PDP Oil 62 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
MCKEE (CLEAR FORK LOWER) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 0.0000 NI **** 4 **** 218.3 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
61 PDP Oil 184 63 40.6250 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
MCKEE (CLEAR FORK) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 3 **** 2.6 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
62 PDP Gas 124 40.6250 WI **** 0.0 **** 2,346.6 **** 0.0 **** 0.0 0.0 0.0 0.0
MCKEE (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 1 **** 58.4 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
63 PDP Oil 64 40.6250 WI **** 0.0 **** 1,703.5 **** 0.0 **** 0.0 0.0 0.0 0.0
RUNNING W (JUDKINS) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000 NI **** 1 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
64 PDP Gas 133 50.0000 WI **** 0.0 **** 193.4 **** 0.0 **** 0.0 0.0 0.0 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:14 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  4

Table II - PDP (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start CurrentInterest WellCntLife UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL / MMCF M / M M / M M / M M M
RUNNING W (JUDKINS) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000 NI **** 1 **** 6.1 **** 0.0 **** 0.0
65 PDP Oil 160 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
RUNNING W (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 9.2 **** 0.0 **** 0.0
66 PDP Gas 67 50.0000 WI **** 0.0 **** 352.1 **** 0.0 **** 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 5 **** 1,307.4 **** 0.0 **** 0.0
67 PDP Oil 69 50.0000 WI **** 0.0 **** 10,516.7 **** 0.0 **** 0.0
RUNNING W (WADDELL) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 13 **** 15,017.4 **** 21.9 **** 0.3
68 PDP Oil 73 50.0000 WI **** 1.4 **** 46,580.8 **** 152.1 **** 1.7
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0
69 PDP Gas 125 50.0000 WI **** 0.0 **** 101.5 **** 0.0 **** 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0
70 PDP Gas 126 50.0000 WI **** 0.0 **** 94.8 **** 0.0 **** 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0
71 PDP Gas 138 50.0000 WI **** 0.0 **** 1.5 **** 0.0 **** 0.0
RUNNING W (WICHITA ALBANY) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 104.8 **** 11.6 **** 1.9
72 PDP Gas 75 50.0000 WI **** 8.1 **** 3,166.2 **** 146.5 **** 23.3
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 72.2 **** 0.0 **** 0.0
73 PDP Oil 77 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0
74 PDP Gas 132 50.0000 WI **** 0.0 **** 391.3 **** 0.0 **** 0.0
RUNNING W NORTH (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 15.5 **** 0.0 **** 0.0
75 PDP Oil 184 50.0000 WI **** 0.0 **** 38.1 **** 0.0 **** 0.0
WADDELL WN ETAL TR D 50.0000 NI **** 1 **** 179.7 **** 44.6 **** 8.2
76 PDP Oil 78 50.0000 WI **** 15.6 **** 701.0 **** 146.7 **** 26.9
SAND HILLS (SAN ANGELO-MCKNIGHT) — CRANE COUNTY,<br>TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 55.7 **** 18.9 **** 2.0
77 PDP Oil 174 50.0000 WI **** 8.9 **** 148.5 **** 39.4 **** 4.0
SAND HILLS (SAN ANGELO) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR C 50.0000 NI **** 1 **** 43.5 **** 5.0 **** 0.3
78 PDP Oil 173 50.0000 WI **** 2.7 **** 64.6 **** 5.4 **** 0.3
SAND HILLS (CLEARFORK) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 7 **** 182.8 **** 73.6 **** 8.4
79 PDP Oil 165 50.0000 WI **** 9.7 **** 4,411.8 **** 1,316.8 **** 148.4
SAND HILLS (ELLENBURGER) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 2 **** 753.5 **** 47.6 **** 7.0
80 PDP Oil 80 50.0000 WI **** 10.4 **** 1,023.2 **** 177.0 **** 25.7
SAND HILLS (ORDOVICIAN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL SEC 20 50.0000 NI **** 0 **** 1,909.2 **** 0.0 **** 0.0
81 PDP Oil 43 81 50.0000 WI **** 0.0 **** 1,352.7 **** 0.0 **** 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:14 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  5

Table II - PDP (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start<br>Date CurrentInterest WellCntLife UltimateRecovery GrossReserves NetReserves
Table Class Major Well No. ASN % MBBL / MMCF M / M M / M M / M M M
SAND HILLS (ORDOVICIAN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 1 **** 8,358.4 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
82 PDP Oil 82 40.6250 WI **** 0.0 **** 7,241.0 **** 0.0 **** 0.0 0.0 0.0 0.0
SAND HILLS (SAN ANGELO UPPER) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000 NI **** 1 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
83 PDP Gas 86 50.0000 WI **** 0.0 **** 8,743.9 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 41 **** 4,926.4 **** 295.2 **** 18.7 671.9 47.7 0.0 941.6 810.3
84 PDP Oil 85 50.0000 WI **** 5.1 **** 22,120.1 **** 1,925.8 **** 117.6 317.5 0.0 0.0
SAND HILLS (WICHITA ALBANY) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 10 **** 343.8 **** 56.0 **** 3.9 139.3 10.7 0.0 210.2 184.0
85 PDP Gas 87 50.0000 WI **** 4.7 **** 5,946.3 **** 451.2 **** 30.2 81.7 0.0 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 425.3 **** 12.3 **** 1.4 49.8 2.6 0.0 53.6 46.1
86 PDP Oil 103 50.0000 WI **** 5.5 **** 2,983.5 **** 21.5 **** 2.4 6.4 0.0 0.0
SAND HILLS (WOJCIK-MCELROY) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 10 **** 8.9 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
87 PDP Gas 114 50.0000 WI **** 0.0 **** 5,083.4 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL WN ETAL TR C 50.0000 NI **** 3 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
88 PDP Gas 140 50.0000 WI **** 0.0 **** 1,111.3 **** 0.0 **** 0.0 0.0 0.0 0.0
SAND HILLS (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 14 **** 2,197.5 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
89 PDP Oil 88 50.0000 WI **** 0.0 **** 4,765.4 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
90 PDP Gas 95 50.0000 WI **** 0.0 **** 5,669.6 **** 0.0 **** 0.0 0.0 0.0 0.0
SAND HILLS EAST (ELLENBURGER) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 2 **** 617.8 **** 20.1 **** 1.4 49.2 2.5 0.0 51.6 44.3
91 PDP Oil 89 50.0000 WI **** 5.2 **** 550.7 **** 27.6 **** 1.8 4.9 0.0 0.0
SAND HILLS S (HOLT) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 0.0000 NI **** 2 **** 157.8 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
92 PDP Oil 92 40.6250 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
SAND HILLS WEST (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 3 **** 12.6 **** 0.6 **** 0.0 0.4 0.3 0.0 4.8 4.6
93 PDP Oil 167 50.0000 WI **** 1.4 **** 806.3 **** 96.5 **** 1.7 4.6 0.0 0.0
SIMPSON (ELLENBURGER-TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 2.1 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
94 PDP Oil 190 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL (WOLF-WICHITA A-TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 0.0000 NI **** 0 **** 43.8 **** 0.0 **** 0.0 0.0 0.0 0.0 0.0 0.0
95 PDP Oil 178 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0 0.0 0.0 0.0
WADDELL (MCKNIGHT) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 6 **** 323.2 **** 98.0 **** 15.7 564.4 36.0 0.0 717.1 600.0
96 PDP Oil 179 50.0000 WI **** 7.0 **** 1,008.8 **** 441.2 **** 69.9 188.8 0.0 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:14 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  6

Table II - PDP (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start CurrentInterest WellCntLife UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL / MMCF M / M M / M M / M M M
WADDELL (WOLF-TUBB-S ANG-MCKN) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 36.1 **** 6.3 **** 0.7
97 PDP Gas 180 50.0000 WI **** 7.4 **** 439.3 **** 144.7 **** 16.8
WADDELL (WICHITA<br>ALB-WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 6 **** 839.2 **** 576.6 **** 125.9
98 PDP Gas 181 50.0000 WI **** 32.2 **** 4,152.8 **** 2,422.8 **** 526.3
WADDELL (WICHITA ALBANY) — CRANE COUNTY,<br>TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 1 **** 95.7 **** 26.3 **** 5.0
99 PDP Oil 182 50.0000 WI **** 9.8 **** 783.1 **** 135.5 **** 25.8
WADDELL (MCKN-TUBB-WA-WC) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 3 **** 282.4 **** 127.9 **** 27.5
100 PDP Oil 189 50.0000 WI **** 19.2 **** 3,458.3 **** 1,586.8 **** 339.4
WADDELL (MCKNIGHT-TUBB) — CRANE COUNTY,<br>TEXAS
WADDELL WN ETAL TR A 2044 50.0000 NI **** 1 **** 7.5 **** 5.4 **** 0.5
101 PDP Oil 198 50.0000 WI **** 3.2 **** 37.7 **** 31.2 **** 3.0
WADDELL (WOLFCAMP-TUBB-SA-MCK) — CRANE COUNTY, TEXAS
WADDELL WN TR A 50.0000 NI **** 3 **** 243.2 **** 65.0 **** 13.5
102 PDP Oil 175 50.0000 WI **** 8.4 **** 1,438.0 **** 506.4 **** 104.3
WADDELL (TUBB-S<br>ANGELO-MCKN) — CRANE COUNTY, TEXAS
WADDELL WN TR A 50.0000 NI **** 3 **** 218.8 **** 92.7 **** 14.8
103 PDP Gas 177 50.0000 WI **** 16.2 **** 1,446.1 **** 561.8 **** 88.6
WADDELL (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN TR A 50.0000 NI **** 1 **** 27.7 **** 0.0 **** 0.0
104 PDP Gas 194 50.0000 WI **** 0.0 **** 369.2 **** 0.0 **** 0.0
WADDELL RANCH (JUDKINS) — CRANE COUNTY,<br>TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 2 **** 8.4 **** 0.0 **** 0.0
105 PDP Oil 191 50.0000 WI **** 0.0 **** 142.4 **** 0.0 **** 0.0
WADDELL RANCH (SAN ANGELO) — CRANE COUNTY,<br>TEXAS
WADDELL WN TR A 50.0000 NI **** 6 **** 236.3 **** 81.5 **** 8.5
106 PDP Oil 176 50.0000 WI **** 9.2 **** 1,749.5 **** 722.3 **** 73.8
WADDELL RANCH (MCKNIGHT) — CRANE COUNTY,<br>TEXAS
WADDELL WN ETAL TR C 50.0000 NI **** 1 **** 47.4 **** 20.8 **** 2.7
107 PDP Oil 192 50.0000 WI **** 8.5 **** 70.3 **** 33.5 **** 4.4
WADDELL WEST<br>(MCELROY-SAN ANGELO) — CRANE COUNTY, TEXAS
WADDELL WN TR A 0.0000 NI **** 1 **** 4.2 **** 0.0 **** 0.0
108 PDP Oil 170 50.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
WADDELL WEST<br>(TUBB-S ANGELO-MCKN) — CRANE COUNTY, TEXAS
WADDELL WN TR A 50.0000 NI **** 22 **** 1,572.4 **** 609.1 **** 93.7
109 PDP Oil 171 50.0000 WI **** 12.9 **** 8,484.9 **** 3,357.1 **** 511.2

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:14 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  7

Table II - PDP (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start CurrentInterest WellCntLife UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL / MMCF M / M M / M M / M M M
Y SOUTH (TUBB) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 0 **** 125.2 **** 0.0 **** 0.0
110 PDP Oil 620 101 40.6250 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
GRAND TOTAL **** 1653 **** 437,779.8 **** 5,823.8 **** 766.0
**** 1,380,780.1 **** 27,189.5 **** 3,337.2

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:14 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  8

Rate-Time History-Forecast Curves

And

TabularReserves and Economics

By Property

Cawley, Gillespie & Associates, Inc.

Petroleum Consultants

LOGO

Table 1

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 1

DUNE (GRAYBURG SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:    CODE:
--- ---
PROPNUM: L8BFQDCB00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 1 CGA2020    01/29/2021    16:31:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 1

Cawley, Gillespie & Associates, Inc.

LOGO

Table 2

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 3

DUNE (GRAYBURG SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:    CODE: CGA103002
--- ---
PROPNUM: L8BFQDEB00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 2 CGA2020    01/29/2021    16:31:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 2

Cawley, Gillespie & Associates, Inc.

LOGO

Table 3

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 1

UNIVERSITY-WADDELL (DEVONIAN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (6) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Avg OilPrice/BBL OilRevenueM GasRevenueM TotalRevenue M
**** 12-2021 **** 0.207
**** 12-2022 **** 0.139
**** 12-2023 **** 0.076
**** 12-2024 **** 0.019
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.441
**** After **** 0.000
**** Total **** 0.441
**** Cum
**** Ult
(11) (12) (13) (14) (15) (17) (19) (20) (21)
End<br><br><br>Mo-Year ProductionTaxes<br>M Ad ValoremTaxes<br>M Wells OtherDeductions<br>M Future NetCash Flow<br>M CumulativeCash Flow Cum.Cash Flow<br>Disc.@ 10.0% M
Net
M M
**** 12-2021 **** 2.0 .0
**** 12-2022 **** 2.0 .0
**** 12-2023 **** 2.0 .0
**** 12-2024 **** 2.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 21.019
Oil Rate **** 289. **** 215. bbls/mo **** 7.5 % **** 0.00 **** 7.5 % **** 3,952. **** 3,952. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 19.893
Gas Rate **** 422. **** 315. Mcf/mo **** 7.5 % **** 0.00 **** 7.5 % **** Revenue **** 15.00 **** 18.903
GOR **** 1,460. **** 1,460. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 18.025
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 17.242
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 16.539
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API:     CODE: CGA183406
--- ---
PROPNUM: L8BFQDOC00 12 Months in first year
3.833 Year Life (10/2024)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 26 CGA2020    01/29/2021    16:31:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 3

Cawley, Gillespie & Associates, Inc.

LOGO

Table 4

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 3

UNIVERSITY-WADDELL (DEVONIAN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 13.197
**** 12-2022 **** 11.793
**** 12-2023 **** 10.467
**** 12-2024 **** 9.214
**** 12-2025 **** 8.030
**** 12-2026 **** 6.911
**** 12-2027 **** 5.853
**** 12-2028 **** 4.853
**** 12-2029 **** 3.909
**** 12-2030 **** 3.016
**** 12-2031 **** 2.173
**** 12-2032 **** 1.376
**** 12-2033 **** 0.623
**** 12-2034 **** 0.047
**** 12-2035 **** 0.000
**** S Tot **** 81.461
**** After **** 0.000
**** Total **** 81.461
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad <br>ValoremTaxesM Wells OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
Net
**** 12-2021 **** 36.0 .0
**** 12-2022 **** 36.0 .0
**** 12-2023 **** 36.0 .0
**** 12-2024 **** 36.0 .0
**** 12-2025 **** 36.0 .0
**** 12-2026 **** 36.0 .0
**** 12-2027 **** 36.0 .0
**** 12-2028 **** 36.0 .0
**** 12-2029 **** 36.0 .0
**** 12-2030 **** 36.0 .0
**** 12-2031 **** 36.0 .0
**** 12-2032 **** 36.0 .0
**** 12-2033 **** 36.0 .0
**** 12-2034 **** 36.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 3,484.431
Oil Rate **** 8,047. **** 3,785. bbls/mo **** 5.5 % **** 0.00 **** 5.5 % **** 3,952. **** 3,952. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 2,955.816
Gas Rate **** 14,549. **** 6,843. Mcf/mo **** 5.5 % **** 0.00 **** 5.5 % **** Revenue **** 15.00 **** 2,564.282
GOR **** 1,800. **** 1,800. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 2,265.711
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 2,032.203
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 1,845.526
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API:    CODE: CGA183402
--- ---
PROPNUM: L8BFQDDB00 12 Months in first year
13.417 Year Life (06/2034)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 27 CGA2020    01/29/2021    16:31:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 4

Cawley, Gillespie & Associates, Inc.

LOGO

Table 5

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 1

WADDELL (GRAYBURG SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross Oil<br>Production<br>MBBLS Gross Gas<br>Production<br>MMCF Net Oil<br>Production<br>MBBLS Net Gas<br>Sales<br>MMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 74,275.0 **** 31,962.9
**** Ult **** 74,275.0 **** 31,962.9

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow .Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: CODE: CGA184501
--- ---
PROPNUM: L8BFQE3B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 30 CGA2020    01/29/2021    16:31:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 5

Cawley, Gillespie & Associates, Inc.

Table 6

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 3

WADDELL (GRAYBURG SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 28.2 **** 394.0
**** Ult **** 28.2 **** 394.0

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:       CODE: CGA184502
--- ---
PROPNUM: L8BFQE6B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 32 CGA2020    01/29/2021    16:31:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 6

Cawley, Gillespie & Associates, Inc.

Table 7

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 1

WADDELL (GRAYBURG) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 6.9 **** 9.0 **** 0.602 **** 0.772
**** 12-2022 **** 5.4 **** 7.1 **** 0.196 **** 0.244
**** 12-2023 **** 0.4 **** 0.5 **** 0.002 **** 0.001
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 12.8 **** 16.6 **** 0.800 **** 1.017
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 12.8 **** 16.6 **** 0.800 **** 1.017
**** Cum **** 84.1 **** 700.6
**** Ult **** 96.8 **** 717.2

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 4.0 **** .0
**** 12-2022 **** 4.0 **** .0
**** 12-2023 **** 4.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 38.801
Oil Rate **** 647. **** 398. bbls/mo **** 23.1 % **** 0.00 **** 20.0 % **** 3,561. **** 3,561. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 37.652
Gas Rate **** 844. **** 519. Mcf/mo **** 23.1 % **** 0.00 **** 20.0 % **** Revenue **** 15.00 **** 36.602
GOR **** 1,300. **** 1,300. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 35.639
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 34.753
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 33.934
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 0000000000 CODE: 201,000,
--- ---
PROPNUM: L8BFQHSC00 12 Months in first year
2.083 Year Life (01/2023)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 149 CGA2020    01/29/2021    16:31:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 7

Cawley, Gillespie & Associates, Inc.

LOGO

Table 8

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A 2075

SAND HILLS (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 10.384
**** 12-2022 **** 8.423
**** 12-2023 **** 7.039
**** 12-2024 **** 6.009
**** 12-2025 **** 5.212
**** 12-2026 **** 4.578
**** 12-2027 **** 4.061
**** 12-2028 **** 3.632
**** 12-2029 **** 3.269
**** 12-2030 **** 2.959
**** 12-2031 **** 2.691
**** 12-2032 **** 2.456
**** 12-2033 **** 2.250
**** 12-2034 **** 2.066
**** 12-2035 **** 1.902
**** S Tot **** 66.930
**** After **** 15.183
**** Total **** 82.114
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
EndMo-Year ProductionTaxesM Ad ValoremTaxesM Wells<br>Gross        NetCount OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 2.0 .0
**** 12-2022 **** 2.0 .0
**** 12-2023 **** 2.0 .0
**** 12-2024 **** 2.0 .0
**** 12-2025 **** 2.0 .0
**** 12-2026 **** 2.0 .0
**** 12-2027 **** 2.0 .0
**** 12-2028 **** 2.0 .0
**** 12-2029 **** 2.0 .0
**** 12-2030 **** 2.0 .0
**** 12-2031 **** 2.0 .0
**** 12-2032 **** 2.0 .0
**** 12-2033 **** 2.0 .0
**** 12-2034 **** 2.0 .0
**** 12-2035 **** 2.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 3,279.733
Oil Rate 2,893. 235. bbls/mo 20.2 % 0.00 5.0 % 4,799. 4,799. $ /w/mo Expense 50.0000 50.0000 10.00 2,566.334
Gas Rate 8,939. 728. Mcf/mo 20.2 % 0.00 5.0 % Revenue 15.00 2,131.406
GOR 3,090. 3,090. scf/bbl Oil 50.0000 50.0000 20.00 1,839.301
Gas Shrinkage 0.0 0.0 % Gas 50.0000 50.0000 25.00 1,629.139
Oil Severance 4.6 4.6 % 30.00 1,470.196
Gas Severance 5.3 5.3 %
Ad Valorem 3.4 %
API: 0000000000 CODE:
--- ---
PROPNUM: UBKN7N281D 12 Months in first year
35.000 Year Life (01/2056)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 195 CGA2020    01/29/2021    16:31:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 8

Cawley, Gillespie & Associates, Inc.

LOGO

Table 9

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A 2076

SAND HILLS (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net Oil<br>Production<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM Total RevenueM
**** 12-2021 **** 11.660
**** 12-2022 **** 9.565
**** 12-2023 **** 8.087
**** 12-2024 **** 6.986
**** 12-2025 **** 6.135
**** 12-2026 **** 5.458
**** 12-2027 **** 4.905
**** 12-2028 **** 4.447
**** 12-2029 **** 4.059
**** 12-2030 **** 3.728
**** 12-2031 **** 3.441
**** 12-2032 **** 3.191
**** 12-2033 **** 2.970
**** 12-2034 **** 2.774
**** 12-2035 **** 2.599
**** S Tot **** 80.005
**** After **** 31.103
**** Total **** 111.108
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells<br>Gross        Net<br>Count OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 1.0 .0
**** 12-2022 **** 1.0 .0
**** 12-2023 **** 1.0 .0
**** 12-2024 **** 1.0 .0
**** 12-2025 **** 1.0 .0
**** 12-2026 **** 1.0 .0
**** 12-2027 **** 1.0 .0
**** 12-2028 **** 1.0 .0
**** 12-2029 **** 1.0 .0
**** 12-2030 **** 1.0 .0
**** 12-2031 **** 1.0 .0
**** 12-2032 **** 1.0 .0
**** 12-2033 **** 1.0 .0
**** 12-2034 **** 1.0 .0
**** 12-2035 **** 1.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 3,961.841
Oil Rate 3,091. 121. bbls/mo 20.2 % 0.00 5.0 % 4,799. 4,799. $ /w/mo Expense 50.0000 50.0000 10.00 2,988.707
Gas Rate 8,200. 321. Mcf/mo 20.2 % 0.00 5.0 % Revenue 15.00 2,438.617
GOR 2,650. 2,650. scf/bbl Oil 50.0000 50.0000 20.00 2,083.540
Gas Shrinkage 0.0 0.0 % Gas 50.0000 50.0000 25.00 1,833.840
Oil Severance 4.6 4.6 % 30.00 1,647.701
Gas Severance 5.3 5.3 %
Ad Valorem 3.4 %
API: 0000000000 CODE:
--- ---
PROPNUM: UBKN7PGB2D 12 Months in first year
49.250 Year Life (04/2070)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 196 CGA2020    01/29/2021    16:31:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 9

Cawley, Gillespie & Associates, Inc.

LOGO

Table10

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (JUDKINS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 4.088
**** 12-2022 **** 0.644
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 4.732
**** After **** 0.000
**** Total **** 4.732
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 146.0 **** .0
**** 12-2022 **** 146.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 365.750
Oil Rate **** 9,441. **** 8,128. bbls/mo **** 9.5 % **** 0.00 **** 9.5 % **** 3,309. **** 3,309. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 357.227
Gas Rate **** 101,518. **** 87,401. Mcf/mo **** 9.5 % **** 0.00 **** 9.5 % **** Revenue **** 15.00 **** 349.362
GOR **** 10,700. **** 10,700. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 342.076
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 335.305
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 328.992
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API:    CODE: CGA175301
--- ---
PROPNUM: L8BFQDHC00 12 Months in first year
1.583 Year Life (07/2022)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 4 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 10

Cawley, Gillespie & Associates, Inc.

Table11

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (JUDKINS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM Total RevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 0000000000 CODE: CGA17530
--- ---
PROPNUM: L8BFQDIC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 5 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 11

Cawley, Gillespie & Associates, Inc.

Table 12

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A/C

SAND HILLS (JUDKINS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum. Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate 0. 0. Mcf/mo 0.0 % 0.00 0.0 % Revenue 15.00 0.000
GOR 0. 0. scf/bbl Oil 0.0000 0.0000 20.00 0.000
Gas Shrinkage 0.0 0.0 % Gas 0.0000 0.0000 25.00 0.000
Oil Severance 0.0 0.0 % 30.00 0.000
Gas Severance 0.0 0.0 %
Ad Valorem 0.0 %
API:    CODE:
--- ---
PROPNUM: NEW169 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 169 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 12

Cawley, Gillespie & Associates, Inc.

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Table 13

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR C

SAND HILLS (JUDKINS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum. Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate 0. 0. bbls/mo 0.0 % 0.00 0.0 % 0. 0. $ /w/mo Expense 50.0000 50.0000 10.00 0.000
Oil Rate 0. 0. Mcf/mo 0.0 % 0.00 0.0 % Revenue 15.00 0.000
Yield **** 0.0 **** 0.0 scf/bbl Oil 0.0000 0.0000 20.00 0.000
Gas Shrinkage 0.0 0.0 % Gas 0.0000 0.0000 25.00 0.000
Oil Severance 0.0 0.0 % 30.00 0.000
Gas Severance 0.0 0.0 %
Ad Valorem 0.0 %
API: 0000000000    CODE: CGA17530
--- ---
PROPNUM: L8BFQDKC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 6 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 13

Cawley, Gillespie & Associates, Inc.

LOGO

Table 14

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

SAND HILLS (JUDKINS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:    CODE: CGA175302
--- ---
PROPNUM: L8BFQDLC00 12Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 7 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 14

Cawley, Gillespie & Associates, Inc.

LOGO

Table 15

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

SAND HILLS (JUDKINS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 40.6250 **** 40.6250 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 40.6250 **** 40.6250 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 0000000000    CODE: CGA17530
--- ---
PROPNUM: L8BFQDNC00 12Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 8 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 15

Cawley, Gillespie & Associates, Inc.

LOGO

Table 16

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

ROBERTSON RESOURCES INCO — WADDELL W N 1

SAND HILLS (MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 12.5000 **** 12.5000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 12.5000 **** 12.5000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 42103056110000    CODE: 142,
--- ---
PROPNUM: L8BFQD0C00 12Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 16 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 16

Cawley, Gillespie & Associates, Inc.

LOGO

Table 17

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net Oil<br><br><br>Production Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue TotalRevenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 148.3 **** 634.4 **** 17.626 **** 74.265
**** 12-2022 **** 139.4 **** 596.3 **** 14.410 **** 60.503
**** 12-2023 **** 131.0 **** 560.5 **** 11.386 **** 47.568
**** 12-2024 **** 123.1 **** 526.8 **** 8.544 **** 35.411
**** 12-2025 **** 115.8 **** 495.2 **** 5.872 **** 23.984
**** 12-2026 **** 108.8 **** 465.4 **** 3.361 **** 13.243
**** 12-2027 **** 94.0 **** 402.0 **** 1.004 **** 3.256
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 860.3 **** 3,680.5 **** 62.202 **** 258.229
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 860.3 **** 3,680.5 **** 62.202 **** 258.229
**** Cum **** 97,141.6 **** 340,873.8
**** Ult **** 98,002.0 **** 344,554.3

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End ProductionTaxes Ad ValoremTaxes Wells OperatingExpense OtherDeductions Investment Future NetCash Flow CumulativeFlow Cash Cum.Cash FlowDisc.@ 10.0%
Net
Mo-Year M M Count M M M M M M
**** 12-2021 **** 105.0 .0
**** 12-2022 **** 105.0 .0
**** 12-2023 **** 105.0 .0
**** 12-2024 **** 105.0 .0
**** 12-2025 **** 105.0 .0
**** 12-2026 **** 105.0 .0
**** 12-2027 **** 105.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 3,354.560
Oil Rate **** 12,708. **** 8,326. bbls/mo **** 6.0 % **** 0.00 **** 6.0 % **** 3,452. **** 3,452. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 3,050.649
Gas Rate **** 54,376. **** 35,613. Mcf/mo **** 6.0 % **** 0.00 **** 6.0 % **** Revenue **** 15.00 **** 2,799.106
GOR **** 4,270. **** 4,270. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 2,588.230
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 2,409.409
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 2,256.198
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API:    CODE: CGA173001
--- ---
PROPNUM: L8BFQDQC00 12 Months in first year
6.917 Year Life (12/2027)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 11 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 17

Cawley, Gillespie & Associates, Inc.

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Table 18

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 0.0 **** 16,869.4
**** Ult **** 0.0 **** 16,869.4

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow<br>Disc.@ 10.0%
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 0000000000 CODE: CGA17300
--- ---
PROPNUM: L8BFQDSC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 12 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 18

Cawley, Gillespie & Associates, Inc.

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Table 19

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A/C

SAND HILLS (MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.007
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.007
**** After **** 0.000
**** Total **** 0.007
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
EndMo-Year ProductionTaxesM Ad ValoremTaxesM Wells<br>Gross Net<br>Count OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum. Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 5.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.344
Oil Rate 490. 479. bbls/mo 8.5 % 0.00 8.5 % 3,452. 3,452. $ /w/mo Expense 50.0000 50.0000 10.00 0.342
Gas Rate 572. 559. Mcf/mo 8.5 % 0.00 8.5 % Revenue 15.00 0.341
GOR 1,160. 1,160. scf/bbl Oil 50.0000 50.0000 20.00 0.340
Gas Shrinkage 0.0 0.0 % Gas 50.0000 50.0000 25.00 0.339
Oil Severance 4.6 4.6 % 30.00 0.337
Gas Severance 5.3 5.3 %
Ad Valorem 3.4 %
API:    CODE:
--- ---
PROPNUM: NEW168 12 Months in first year
0.333 Year Life (04/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 168 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 19

Cawley, Gillespie & Associates, Inc.

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Table 20

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR C

SAND HILLS (MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.214
**** 12-2022 **** 0.175
**** 12-2023 **** 0.137
**** 12-2024 **** 0.103
**** 12-2025 **** 0.070
**** 12-2026 **** 0.039
**** 12-2027 **** 0.010
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.747
**** After **** 0.000
**** Total **** 0.747
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
EndMo-Year ProductionTaxesM Ad ValoremTaxesM WellsGross Net<br>Count OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum. Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 1.0 .0
**** 12-2022 **** 1.0 .0
**** 12-2023 **** 1.0 .0
**** 12-2024 **** 1.0 .0
**** 12-2025 **** 1.0 .0
**** 12-2026 **** 1.0 .0
**** 12-2027 **** 1.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 31.279
Oil Rate 156. 103. bbls/mo 6.0 % 0.00 6.0 % 3,452. 3,452. $ /w/mo Expense 50.0000 50.0000 10.00 28.469
Gas Rate 33. 22. Mcf/mo 6.0 % 0.00 6.0 % Revenue 15.00 26.141
GOR 216. 216. scf/bbl Oil 50.0000 50.0000 20.00 24.186
Gas Shrinkage 0.0 0.0 % Gas 50.0000 50.0000 25.00 22.527
Oil Severance 4.6 4.6 % 30.00 21.104
Gas Severance 5.3 5.3 %
Ad Valorem 3.4 %
API:    CODE: CGA173004
--- ---
PROPNUM: L8BFQDTC00 12 Months in first year
6.833 Year Life (10/2027)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 13 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 20

Cawley, Gillespie & Associates, Inc.

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Table 21

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

SAND HILLS (MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells<br>Gross Net<br>Count OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum. Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate 0. 0. Mcf/mo 0.0 % 0.00 0.0 % 0. 0. $ /w/mo Expense 40.6250 40.6250 10.00 0.000
Gas Rate 0. 0. bbls/mo 0.0 % 0.00 0.0 % Revenue 15.00 0.000
GOR 0. 0 0.0 bbl/MMcf Oil 40.6250 40.6250 20.00 0.000
Gas Shrinkage 0.0 0.0 % Gas 40.6250 40.6250 25.00 0.000
Oil Severance 0.0 0.0 % 30.00 0.000
Gas Severance 0.0 %
Ad Valorem 0.0 %
API: 0000000000    CODE: CGA17300
--- ---
PROPNUM: L8BFQDVC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 14 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 21

Cawley, Gillespie & Associates, Inc.

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Table 22

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR C

SAND HILLS (TUBB - SAN ANGELO) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenue M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
Net
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum.Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:    CODE: CGA172802
--- ---
PROPNUM: QASED69R2Y 12Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 188 CGA2020    01/29/2021    16:31:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 22

Cawley, Gillespie & Associates, Inc.

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Table 23

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 13.781
**** 12-2022 **** 10.185
**** 12-2023 **** 6.824
**** 12-2024 **** 3.680
**** 12-2025 **** 0.821
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 35.291
**** After **** 0.000
**** Total **** 35.291
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 89.0 **** .0
**** 12-2022 **** 89.0 **** .0
**** 12-2023 **** 89.0 **** .0
**** 12-2024 **** 89.0 **** .0
**** 12-2025 **** 89.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 2,055.235
Oil Rate **** 13,147. **** 9,607. bbls/mo **** 6.5 % **** 0.00 **** 6.5 % **** 4,941. **** 4,941. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 1,921.265
Gas Rate **** 68,010. **** 49,700. Mcf/mo **** 6.5 % **** 0.00 **** 6.5 % **** Revenue **** 15.00 **** 1,805.559
GOR **** 5,170. **** 5,170. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 1,704.769
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 1,616.293
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 1,538.081
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API:    CODE: CGA172801
--- ---
PROPNUM: L8BFQD3B00 12Months in first year
4.750 Year Life (10/2025)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 19 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 23

Cawley, Gillespie & Associates, Inc.

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Table 24

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 0.0 **** 4,368.6
**** Ult **** 0.0 **** 4,368.6

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum.Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
GasRate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 0000000000      CODE: CGA17280
--- ---
PROPNUM: L8BFQD4B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN20 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 24

Cawley, Gillespie & Associates, Inc.

LOGO

Table 25

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR C

SAND HILLS (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross Oil<br>Production<br>MBBLS Gross Gas<br>Production<br>MMCF Net Oil<br>Production<br>MBBLS Net Gas<br>Sales<br>MMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 1,878.9 **** 407.3
**** Ult **** 1,878.9 **** 407.3

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** STot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Unit Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:      CODE: CGA172802
--- ---
PROPNUM: L8BFQD6B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 21 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 25

Cawley, Gillespie & Associates, Inc.

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Table 26

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

SAND HILLS (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 2,647.1 **** 5,882.0
**** Ult **** 2,647.1 **** 5,882.0

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. **** bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. **** /w/mo Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. **** Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. **** scf/bbl Oil **** 40.6250 **** 40.6250 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 **** % Gas **** 40.6250 **** 40.6250 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 **** % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 **** %
Ad Valorem **** 0.0 **** %

All values are in US Dollars.

API:       CODE: CGA172803
PROPNUM: L8BFQD7B00 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 22 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 26

Cawley, Gillespie & Associates, Inc.

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Table 27

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

SAND HILLS (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM WellsGross        NetCount OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Eva luation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 0000000000    CODE: CGA17280
--- ---
PROPNUM: L8BFQD9B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 23 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 27

Cawley, Gillespie & Associates, Inc.

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Table 28

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR J

SAND HILLS (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 40.6250 **** 40.6250 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 40.6250 **** 40.6250 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:    CODE: CGA17806
--- ---
PROPNUM: L8BFQGKC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 25 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 28

Cawley, Gillespie & Associates, Inc.

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Table 29

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 3

BLOCK 31 NW (PENN UPPER) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210310597    CODE: 100,103,
--- ---
PROPNUM: L8BFQE9B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 41 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 29

Cawley, Gillespie & Associates, Inc.

LOGO

Table 30

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 4

BLOCK 31 NW (PENN UPPER) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:    4210310597 CODE: 100,103,
--- ---
PROPNUM: L8BFQEAB00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 42 CGA2020    01/29/2021    16:31:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 30

Cawley, Gillespie & Associates, Inc.

LOGO

Table 31

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 1

DUNE (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: MIN    CODE: 201,000,011915A
--- ---
PROPNUM: L8BFQESC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 53 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 31

Cawley, Gillespie & Associates, Inc.

LOGO

Table 32

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 3

DUNE (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 873.3 **** 461.8
**** Ult **** 873.3 **** 461.8

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: MIN    CODE: 201,000,011915B
--- --- ---
PROPNUM: L8BFQETC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 54 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 32

Cawley, Gillespie & Associates, Inc.

LOGO

Table 33

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 1

EDWARDS (GRAYBURG) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 178.4 **** 0.0
**** Ult **** 178.4 **** 0.0

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210301056    CODE: 100,103,
--- --- ---
PROPNUM: L8BFQEWC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 56 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 33

Cawley, Gillespie & Associates, Inc.

LOGO

Table 34

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR 1

RM (CLEARFORK) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210334580    CODE: 100,103,
--- ---
PROPNUM: L8BFQG1C00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 120 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 34

Cawley, Gillespie & Associates, Inc.

LOGO

Table 35

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 3

UNIVERSITY WADDELL (GRAYBURG) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210333082    CODE:
--- ---
PROPNUM: PBQMQ7K3R6 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 185 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 35

Cawley, Gillespie & Associates, Inc.

LOGO

Table 36

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 3

UNIVERSITY WADDELL (ELLENBURGER) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:    CODE:
--- ---
PROPNUM: NEW166 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 166 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 36

Cawley, Gillespie & Associates, Inc.

LOGO

Table 37

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 3

UNIVERSITY WADDELL (PENN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210301595 CODE: 100,103,
--- ---
PROPNUM: L8BFQG7B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 97 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 37

Cawley, Gillespie & Associates, Inc.

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Table 38

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR 3

UNIVERSITY WADDELL (WADDELL SD) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.133
**** 12-2022 **** 1.889
**** 12-2023 **** 1.688
**** 12-2024 **** 1.521
**** 12-2025 **** 1.378
**** 12-2026 **** 1.257
**** 12-2027 **** 1.150
**** 12-2028 **** 1.058
**** 12-2029 **** 0.973
**** 12-2030 **** 0.894
**** 12-2031 **** 0.820
**** 12-2032 **** 0.750
**** 12-2033 **** 0.684
**** 12-2034 **** 0.622
**** 12-2035 **** 0.564
**** S Tot **** 17.382
**** After **** 3.432
**** Total **** 20.814
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 1.0 **** .0
**** 12-2027 **** 1.0 **** .0
**** 12-2028 **** 1.0 **** .0
**** 12-2029 **** 1.0 **** .0
**** 12-2030 **** 1.0 **** .0
**** 12-2031 **** 1.0 **** .0
**** 12-2032 **** 1.0 **** .0
**** 12-2033 **** 1.0 **** .0
**** 12-2034 **** 1.0 **** .0
**** 12-2035 **** 1.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 679.754
Oil Rate **** 801. **** 106. bbls/mo **** 10.8 % **** 0.00 **** 6.0 % **** 3,561. **** 3,561. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 523.094
Gas Rate **** 120. **** 16. Mcf/mo **** 10.8 % **** 0.00 **** 6.0 % **** Revenue **** 15.00 **** 426.589
GOR **** 150. **** 150. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 362.027
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 316.050
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 281.708
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210333675 CODE: 100,103,
--- ---
PROPNUM: L8BFQGFB00 12 Months in first year
30.167 Year Life (03/2051)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 102 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 38

Cawley, Gillespie & Associates, Inc.

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Table 39

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 3

WADDELL (WICHITA ALBANY) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 8.9 **** 7.7
**** Ult **** 8.9 **** 7.7

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 375.5000 **** 37.5000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 0000000000      CODE:
--- ---
PROPNUM: SC1M6KWR1A 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 193 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 39

Cawley, Gillespie & Associates, Inc.

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Table 40

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 1

WADDELL (DEVONIAN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 3.0 **** 11.9 **** 0.280 **** 1.080
**** 12-2022 **** 2.8 **** 11.1 **** 0.230 **** 0.884
**** 12-2023 **** 2.7 **** 10.4 **** 0.184 **** 0.701
**** 12-2024 **** 2.5 **** 9.8 **** 0.140 **** 0.530
**** 12-2025 **** 2.4 **** 9.2 **** 0.099 **** 0.369
**** 12-2026 **** 2.2 **** 8.6 **** 0.060 **** 0.218
**** 12-2027 **** 2.1 **** 8.1 **** 0.024 **** 0.077
**** 12-2028 **** 0.3 **** 1.3 **** 0.001 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 18.1 **** 70.4 **** 1.018 **** 3.860
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 18.1 **** 70.4 **** 1.018 **** 3.860
**** Cum **** 177.0 **** 340.5
**** Ult **** 195.0 **** 410.9

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 2.0 **** .0
**** 12-2022 **** 2.0 **** .0
**** 12-2023 **** 2.0 **** .0
**** 12-2024 **** 2.0 **** .0
**** 12-2025 **** 2.0 **** .0
**** 12-2026 **** 2.0 **** .0
**** 12-2027 **** 2.0 **** .0
**** 12-2028 **** 2.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 53.599
Oil Rate **** 259. **** 167. bbls/mo **** 6.0 % **** 0.00 **** 6.0 % **** 3,561. **** 3,561. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 48.597
Gas Rate **** 1,016. **** 648. Mcf/mo **** 6.2 % **** 0.00 **** 6.2 % **** Revenue **** 15.00 **** 44.477
GOR **** 3,910. **** 3,860. scf/bbl **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 41.037
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 375.5000 **** 37.5000 **** 25.00 **** 38.131
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 35.649
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 0000000000      CODE: 101,000,
--- ---
PROPNUM: L8BFQG9B00 12 Months in first year
7.167 Year Life (03/2028)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 98 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 40

Cawley, Gillespie & Associates, Inc.

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Table 41

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WN WADDELL DPU 1233 ERDU

WADDELL (DEVONIAN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 0.6 **** 0.6
**** Ult **** 0.6 **** 0.6

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. **** bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 18.7500 **** 18.7500 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. **** Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. **** scf/bbl **** Oil **** 18.7500 **** 18.7500 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 **** % **** Gas **** 18.7500 **** 18.7500 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 **** % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 **** %
Ad Valorem **** 0.0 **** %
API: 4210334560      CODE:
--- ---
PROPNUM: VBJHAK661W 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 197 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 41

Cawley, Gillespie & Associates, Inc.

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Table 42

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 3

WADDELL (GRAYBURG) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenue M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 0000000000    CODE: 201,000,
--- ---
PROPNUM:L8BFQHLC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 145 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 42

Cawley, Gillespie & Associates, Inc.

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Table 43

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR 1

WADDELL (GRAYBURG-QUEEN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 37.5000 **** 37.5000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 37.5000 **** 37.5000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 37.5000 **** 37.5000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 0000000000    CODE: 201,000,
--- ---
PROPNUM: L8BFQGAB00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 99 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 43

Cawley, Gillespie & Associates, Inc.

LOGO

Table 44

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

BLOCK 27 (MCKEE) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 0000000000    CODE: 201,000,
--- ---
PROPNUM: L8BFQE7B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 39 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 44

Cawley, Gillespie & Associates, Inc.

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Table 45

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

BLOCK B-21 (ELLENBURGER-TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.165
**** 12-2022 **** 0.115
**** 12-2023 **** 0.071
**** 12-2024 **** 0.032
**** 12-2025 **** 0.003
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.385
**** After **** 0.000
**** Total **** 0.385
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 38.056
Oil Rate **** 105. **** 62. bbls/mo **** 11.5 % **** 0.00 **** 11.5 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 35.788
Gas Rate **** 1,895. **** 1,116. Mcf/mo **** 11.5 % **** 0.00 **** 11.5 % **** Revenue **** 15.00 **** 33.812
GOR **** 18,000. **** 18,000. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 32.078
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 30.545
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 29.181
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210301737    CODE:
--- ---
PROPNUM: PBQMMJ25O6 12 Months in first year
4.417 Year Life (06/2025)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 183 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 45

Cawley, Gillespie & Associates, Inc.

LOGO

Table 46

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL

BLOCK B-21 (ELLENBURGER) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210301714    CODE: 100,103,
--- ---
PROPNUM: L8BFQECB00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 43 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 46

Cawley, Gillespie & Associates, Inc.

LOGO

Table 47

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

BLOCK B-21 (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br>Production Gross Gas<br>Production Net Oil<br><br><br>Production Net Gas<br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End Production<br>Taxes Ad Valorem<br>Taxes Wells<br><br><br>Gross     Net Operating<br>Expense Other<br>Deductions Investment Future Net<br>Cash Flow Cumulative<br>Cash Flow Cum.Cash Flow<br>Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210301812    CODE: 100,103,
--- ---
PROPNUM: L8BFQEFB00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 45 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 47

Cawley, Gillespie & Associates, Inc.

LOGO

Table 48

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch

Properties Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A 0357

BLOCK B-27 (CONNELL) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br>Production Gross Gas<br>Production Net Oil<br><br><br>Production Net Gas<br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End Production<br>Taxes Ad Valorem<br>Taxes Wells<br><br><br>Gross     Net Operating<br>Expense Other<br>Deductions Investment Future Net<br>Cash Flow Cumulative<br>Cash Flow Cum.Cash Flow<br>Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 42-103-01825    CODE: 100-10
--- ---
PROPNUM: L8BFQHAB00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 137 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 48

Cawley, Gillespie & Associates, Inc.

LOGO

Table 49

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

C-BAR (SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 656.6 **** 0.0
**** Ult **** 656.6 **** 0.0

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210301852    CODE: 100,103,
--- ---
PROPNUM: L8BFQEHC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 46 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 49

Cawley, Gillespie & Associates, Inc.

LOGO

Table 50

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

CORDONA LAKE (DEVONIAN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 646.9 **** 0.0
**** Ult **** 646.9 **** 0.0

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210301691    CODE: 100,103,
--- ---
PROPNUM: L8BFQEIC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 47 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 50

Cawley, Gillespie & Associates, Inc.

LOGO

Table 51

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

CORDONA LAKE N (DEVONIAN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 1,070.6 **** 3,849.1
**** Ult **** 1,070.6 **** 3,849.1

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 40.6250 **** 40.6250 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 40.6250 **** 40.6250 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210302083    CODE: 100,103,
--- ---
PROPNUM: L8BFQELC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 49 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 51

Cawley, Gillespie & Associates, Inc.

LOGO

Table 52

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

CORDONA LAKE N (TUBB 4500) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 1,058.6 **** 0.0
**** Ult **** 1,058.6 **** 0.0

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 15.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 25.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Ad Valorem **** 0.0 %
API: 4210302095      CODE: 100,103,
--- ---
PROPNUM: L8BFQEKC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 48 CGA2020    01/29/2021    16:31:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 52

Cawley, Gillespie & Associates, Inc.

LOGO

Table 53

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

CORDONA LAKE SW (DEVONIAN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 5.8 **** 6.9 **** 0.301 **** 0.344
**** 12-2022 **** 5.2 **** 6.2 **** 0.121 **** 0.132
**** 12-2023 **** 1.2 **** 1.4 **** 0.005 **** 0.002
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 12.2 **** 14.5 **** 0.427 **** 0.478
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 12.2 **** 14.5 **** 0.427 **** 0.478
**** Cum **** 578.5 **** 1,069.7
**** Ult **** 590.8 **** 1,084.2

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 3.0 **** .0
**** 12-2022 **** 3.0 **** .0
**** 12-2023 **** 3.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 20.417
Oil Rate **** 509. **** 401. bbls/mo **** 10.5 % **** 0.00 **** 10.5 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 19.754
Gas Rate **** 604. **** 475. Mcf/mo **** 10.5 % **** 0.00 **** 10.5 % **** Revenue **** 15.00 **** 19.150
GOR **** 1,180. **** 1,180. scf/bbl **** Oil **** 40.6250 **** 40.6250 **** 20.00 **** 18.598
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 40.6250 **** 40.6250 **** 25.00 **** 18.092
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 17.625
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210310883    CODE: 100,103,
--- ---
PROPNUM: L8BFQENC00 12 Months in first year
2.250 Year Life (04/2023)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 50 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 53

Cawley, Gillespie & Associates, Inc.

LOGO

Table 54

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

CORDONA LAKE W (DEVONIAN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.171
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.171
**** After **** 0.000
**** Total **** 0.171
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 8.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 11.182
Oil Rate **** 887. **** 778. bbls/mo **** 16.0 % **** 0.00 **** 16.0 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 11.045
Gas Rate **** 5,909. **** 5,185. Mcf/mo **** 16.0 % **** 0.00 **** 16.0 % **** Revenue **** 15.00 **** 10.915
GOR **** 6,660. **** 6,660. scf/bbl **** Oil **** 40.6250 **** 40.6250 **** 20.00 **** 10.794
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 40.6250 **** 40.6250 **** 25.00 **** 10.679
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 10.570
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210310601    CODE: 100,103,
--- ---
PROPNUM: L8BFQEPC00 12 Months in first year
0.833 Year Life (10/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 51 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 54

Cawley, Gillespie & Associates, Inc.

LOGO

Table 55

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

VANGUARD OPERATING LLC — WADDELL W N 1

CRAWAR (SAN ANDRES CONS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 9.2940 **** 9.2940 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 42103055850001    CODE: 142,
--- ---
PROPNUM: L8BFQG4B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 94 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 55

Cawley, Gillespie & Associates, Inc.

LOGO

Table 56

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR E

DELL (SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.002
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.002
**** After **** 0.000
**** Total **** 0.002
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.113
Oil Rate **** 148. **** 145. bbls/mo **** 7.5 % **** 0.00 **** 7.5 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.112
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.112
GOR **** 0. **** 0. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.111
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.111
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 0.110
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 42103057280000      CODE: 142,
--- ---
PROPNUM: L8BFQEQC00 12 Months in first year
0.333 Year Life (04/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 52 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 56

Cawley, Gillespie & Associates, Inc.

LOGO

Table 57

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR H

LEA (SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 221.5 **** 303.3
**** Ult **** 221.5 **** 303.3

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210301697 CODE: 100,103,
--- ---
PROPNUM: L8BFQE0C00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 57 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 57

Cawley, Gillespie & Associates, Inc.

LOGO

Table 58

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR H

LEA SOUTH (CLEAR FORK) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.580
**** 12-2022 **** 0.484
**** 12-2023 **** 0.397
**** 12-2024 **** 0.315
**** 12-2025 **** 0.241
**** 12-2026 **** 0.172
**** 12-2027 **** 0.109
**** 12-2028 **** 0.051
**** 12-2029 **** 0.005
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 2.355
**** After **** 0.000
**** Total **** 2.355
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 1.0 **** .0
**** 12-2027 **** 1.0 **** .0
**** 12-2028 **** 1.0 **** .0
**** 12-2029 **** 1.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 97.023
Oil Rate **** 286. **** 142. bbls/mo **** 8.0 % **** 0.00 **** 8.0 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 86.831
Gas Rate **** 76. **** 37. Mcf/mo **** 8.0 % **** 0.00 **** 8.0 % **** Revenue **** 15.00 **** 78.615
GOR **** 267. **** 267. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 71.884
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 66.290
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 61.582
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210301992      CODE: 100,103,
--- ---
PROPNUM: L8BFQEOC00 12 Months in first year
8.500 Year Life (07/2029)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 59 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 58

Cawley, Gillespie & Associates, Inc.

LOGO

Table 59

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR H

LEA SOUTH (SAN ANGELO) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue TotalRevenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.066
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.066
**** After **** 0.000
**** Total **** 0.066
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 4.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 3.084
Oil Rate **** 597. **** 561. bbls/mo **** 9.0 % **** 0.00 **** 9.0 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 3.048
Gas Rate **** 299. **** 280. Mcf/mo **** 9.0 % **** 0.00 **** 9.0 % **** Revenue **** 15.00 **** 3.015
GOR **** 500. **** 500. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 2.984
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 2.954
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 2.926
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210333455    CODE: 100,103,
--- ---
PROPNUM: L8BFQF0B00 12 Months in first year
0.750 Year Life (10/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 61 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 59

Cawley, Gillespie & Associates, Inc.

LOGO

Table 60

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR H

LEA SOUTH (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue TotalRevenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210332989    CODE: 100,103,
--- ---
PROPNUM: L8BFQF1B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 62 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 60

Cawley, Gillespie & Associates, Inc.

LOGO

Table 61

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I 184

MCKEE (CLEAR FORK LOWER) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue TotalRevenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210302474    CODE:100,103,
--- ---
PROPNUM: L8BFQF3B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 63 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 61

Cawley, Gillespie & Associates, Inc.

LOGO

Table 62

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

MCKEE (CLEAR FORK) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 2.6 **** 2,346.6
**** Ult **** 2.6 **** 2,346.6

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 40.6250 **** 40.6250 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 40.6250 **** 40.6250 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:      CODE:
--- ---
PROPNUM: L8BFQH1B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 124 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 62

Cawley, Gillespie & Associates, Inc.

LOGO

Table 63

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

MCKEE (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 58.4 **** 1,703.5
**** Ult **** 58.4 **** 1,703.5

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 40.6250 **** 40.6250 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 40.6250 **** 40.6250 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210301690  CODE: 100,103,
--- ---
PROPNUM: L8BFQF4B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 64 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 63

Cawley, Gillespie & Associates, Inc.

LOGO

Table 64

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W (JUDKINS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 0.0 **** 193.4
**** Ult **** 0.0 **** 193.4

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:      CODE:
--- ---
PROPNUM: L8BFQH9B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 133 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 64

Cawley, Gillespie & Associates, Inc.

LOGO

Table 65

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W (JUDKINS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 6.1 **** 0.0
**** Ult **** 6.1 **** 0.0

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units_ Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:      CODE:
--- ---
PROPNUM: L8BFQTRB160 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 160 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 65

Cawley, Gillespie & Associates, Inc.

LOGO

Table 66

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 9.2 **** 352.1
**** Ult **** 9.2 **** 352.1

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units_ Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210302292  CODE: 200,103,
--- ---
PROPNUM: L8BFQF9B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 67 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 66

Cawley, Gillespie & Associates, Inc.

LOGO

Table 67

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210302304    CODE: 100,103,
--- ---
PROPNUM: L8BFQFCB00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 69 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 67

Cawley, Gillespie & Associates, Inc.

LOGO

Table 68

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W (WADDELL) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br>Production Gross Gas<br>Production Net Oil<br><br><br>Production Net Gas<br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.271
**** 12-2022 **** 0.029
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.300
**** After **** 0.000
**** Total **** 0.300
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 13.0 **** .0
**** 12-2022 **** 13.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 19.048
Oil Rate **** 1,332. **** 1,244. bbls/mo **** 5.0 % **** 0.00 **** 5.0 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 18.646
Gas Rate **** 9,259. **** 8,647. Mcf/mo **** 5.0 % **** 0.00 **** 5.0 % **** Revenue **** 15.00 **** 18.273
GOR **** 6,940. **** 6,940. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 17.926
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 17.603
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 17.301
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210302296    CODE: 100,103,
--- ---
PROPNUM: L8BFQFHC00 12 Months in first year
1.417 Year Life (06/2022)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 73 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 68

Cawley, Gillespie & Associates, Inc.

LOGO

Table 69

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W (WADDELL) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br>Production Gross Gas<br>Production Net OilProduction Net Gas<br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End Production<br>Taxes Ad Valorem<br>Taxes Wells<br><br><br>Gross     Net Operating<br>Expense Other<br>Deductions Investment Future Net<br>Cash Flow Cumulative<br>Cash Flow Cum.Cash Flow<br>Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:      CODE:
--- ---
PROPNUM: L8BFQH3B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 125 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 69

Cawley, Gillespie & Associates, Inc.

LOGO

Table 70

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W (WADDELL) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End Production<br>Taxes Ad Valorem<br>Taxes Wells<br><br><br>Gross    Net Operating<br>Expense Other<br>Deductions Investment Future Net<br>Cash Flow Cumulative<br>Cash Flow Cum.Cash Flow<br>Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. **** Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. **** bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 **** bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 **** % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 **** % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 **** %
Ad Valorem **** 0.0 **** %
API:      CODE:
--- ---
PROPNUM: L8BFQH4B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 126 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 70

Cawley, Gillespie & Associates, Inc.

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here]

Table 71

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W (WADDELL) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br><br><br>Production Gross Gas<br><br><br>Production Net Oil<br><br><br>Production Net Gas<br><br><br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 0.000 **** 0.000
**** After **** 0.0 **** 0.0 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 0.000 **** 0.000
**** Cum **** 0.0 **** 1.5
**** Ult **** 0.0 **** 1.5

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End Production<br>Taxes Ad Valorem<br>Taxes Wells<br><br><br>Gross    Net Operating<br>Expense Other<br>Deductions Investment Future Net<br>Cash Flow Cumulative<br>Cash Flow Cum.Cash Flow<br>Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210335253     CODE:
--- ---
PROPNUM: L8BFQHCB00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 138 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 71

Cawley, Gillespie & Associates, Inc.

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Table 72

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W (WICHITA ALBANY) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.508
**** 12-2022 **** 0.408
**** 12-2023 **** 0.321
**** 12-2024 **** 0.245
**** 12-2025 **** 0.178
**** 12-2026 **** 0.120
**** 12-2027 **** 0.068
**** 12-2028 **** 0.024
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 1.871
**** After **** 0.000
**** Total **** 1.871
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 1.0 **** .0
**** 12-2027 **** 1.0 **** .0
**** 12-2028 **** 1.0 **** .0
**** 12-2029 **** 1.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 147.214
Gas Rate **** 2,455. **** 843. Mcf/mo **** 12.5 % **** 0.00 **** 12.5 % **** 4,291. **** 4,291. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 132.876
Oil Rate **** 195. **** 67. bbls/mo **** 12.5 % **** 0.00 **** 12.5 % **** Revenue **** 15.00 **** 121.190
Yield **** 79.5 **** 79.5 bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 111.521
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 103.414
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 96.536
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210330778    CODE: 200,103,
--- ---
PROPNUM: L8BFQFKC00 12 Months in first year
8.083 Year Life (01/2029)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 75 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 72

Cawley, Gillespie & Associates, Inc.

LOGO

Table 73

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W (WICHITA ALBANY) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210301856    CODE: 100,103,
--- ---
PROPNUM: L8BFQFNC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 77 CGA2020    01/29/2021    16:31:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 73

Cawley, Gillespie & Associates, Inc.

LOGO

Table 74

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W (WICHITA ALBANY) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM Total RevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0. **** 0. bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:    CODE:
--- ---
PROPNUM: L8BFQH7B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 132 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 74

Cawley, Gillespie & Associates, Inc.

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Table 75

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

RUNNING W NORTH (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenue M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210301957    CODE:
--- ---
PROPNUM: PBQMNOUAQA 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 184 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 75

Cawley, Gillespie & Associates, Inc.

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Table 76

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR D

RUNNING W NORTH (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.268
**** 12-2022 **** 1.126
**** 12-2023 **** 0.995
**** 12-2024 **** 0.875
**** 12-2025 **** 0.765
**** 12-2026 **** 0.663
**** 12-2027 **** 0.570
**** 12-2028 **** 0.484
**** 12-2029 **** 0.405
**** 12-2030 **** 0.332
**** 12-2031 **** 0.265
**** 12-2032 **** 0.203
**** 12-2033 **** 0.147
**** 12-2034 **** 0.095
**** 12-2035 **** 0.047
**** S Tot **** 8.239
**** After **** 0.007
**** Total **** 8.246
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 1.0 **** .0
**** 12-2027 **** 1.0 **** .0
**** 12-2028 **** 1.0 **** .0
**** 12-2029 **** 1.0 **** .0
**** 12-2030 **** 1.0 **** .0
**** 12-2031 **** 1.0 **** .0
**** 12-2032 **** 1.0 **** .0
**** 12-2033 **** 1.0 **** .0
**** 12-2034 **** 1.0 **** .0
**** 12-2035 **** 1.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 380.467
Oil Rate **** 424. **** 116. bbls/mo **** 8.0 % **** 0.00 **** 8.0 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 318.875
Gas Rate **** 1,396 **** 383. Mcf/mo **** 8.0 % **** 0.00 **** 8.0 % **** Revenue **** 15.00 **** 274.365
GOR **** 3,290. **** 3,290. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 241.057
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 215.380
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 195.077
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 03.4 %
API: 4210332471      CODE: 100,103,
--- ---
PROPNUM:L8BFQFPC00 12 Months in first year
15.583 Year Life (01/2036)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 78 CGA2021    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 76

Cawley, Gillespie & Associates, Inc.

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Table 77

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (SAN ANGELO-MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.458
**** 12-2022 **** 0.387
**** 12-2023 **** 0.322
**** 12-2024 **** 0.262
**** 12-2025 **** 0.205
**** 12-2026 **** 0.153
**** 12-2027 **** 0.104
**** 12-2028 **** 0.059
**** 12-2029 **** 0.017
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 1.966
**** After **** 0.000
**** Total **** 1.966
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM WellsGross    Net<br>Count OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 1.0 .0
**** 12-2022 **** 1.0 .0
**** 12-2023 **** 1.0 .0
**** 12-2024 **** 1.0 .0
**** 12-2025 **** 1.0 .0
**** 12-2026 **** 1.0 .0
**** 12-2027 **** 1.0 .0
**** 12-2028 **** 1.0 .0
**** 12-2029 **** 1.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 90.926
Oil Rate **** 238. **** 125. bbls/mo **** 7.0 % **** 0.00 **** 7.0 % **** 4,799. **** 4,799. $ /w/mo Expense **** 50.0000 **** 50.0000 **** 10.00 **** 80.896
Gas Rate **** 498. **** 262. Mcf/mo **** 7.0 % **** 0.00 **** 7.0 % Revenue **** 15.00 **** 72.881
GOR **** 2,090. **** 2,090. scf/bbl Oil **** 50.0000 **** 50.0000 **** 20.00 **** 66.366
Gas Shrinkage **** 0.0 **** 0.0 % Gas **** 50.0000 **** 50.0000 **** 25.00 **** 60.988
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 56.489
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210332587    CODE:
--- ---
PROPNUM: PBQLKCAO66 12 Months in first year
8.917 Year Life (12/2029)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 174 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 77

Cawley, Gillespie & Associates, Inc.

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Table 78

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR C

SAND HILLS (SAN ANGELO) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br>Production Gross Gas<br>Production Net Oil<br><br><br>Production Net Gas<br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.162
**** 12-2022 **** 0.077
**** 12-2023 **** 0.013
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.252
**** After **** 0.000
**** Total **** 0.252
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 11.947
Oil Rate **** 182. **** 134. bbls/mo **** 12.7 % **** 0.00 **** 9.6 % **** 4,799. **** 4,799. $ /w/mo Expense **** 50.0000 **** 50.0000 **** 10.00 **** 11.504
Gas Rate **** 195. **** 144. Mcf/mo **** 12.7 % **** 0.00 **** 9.6 % Revenue **** 15.00 **** 11.105
GOR **** 1,070. **** 1,070. scf/bbl Oil **** 50.0000 **** 50.0000 **** 20.00 **** 10.742
Gas Shrinkage **** 0.0 **** 0.0 % Gas **** 50.0000 **** 50.0000 **** 25.00 **** 10.412
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 10.109
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210332594    CODE:
--- ---
PROPNUM: PBQLECNS47 12 Months in first year
2.667 Year Life (09/2023)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 173 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 78

Cawley, Gillespie & Associates, Inc.

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Table 79

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (CLEARFORK) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br>Production Gross Gas<br>Production Net Oil<br><br><br>Production Net Gas<br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.109
**** 12-2022 **** 1.676
**** 12-2023 **** 1.329
**** 12-2024 **** 1.043
**** 12-2025 **** 0.804
**** 12-2026 **** 0.601
**** 12-2027 **** 0.426
**** 12-2028 **** 0.275
**** 12-2029 **** 0.142
**** 12-2030 **** 0.029
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 8.433
**** After **** 0.000
**** Total **** 8.433
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 7.0 **** .0
**** 12-2022 **** 7.0 **** .0
**** 12-2023 **** 7.0 **** .0
**** 12-2024 **** 7.0 **** .0
**** 12-2025 **** 7.0 **** .0
**** 12-2026 **** 7.0 **** .0
**** 12-2027 **** 7.0 **** .0
**** 12-2028 **** 7.0 **** .0
**** 12-2029 **** 7.0 **** .0
**** 12-2030 **** 7.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 783.234
Oil Rate **** 972. **** 435. bbls/mo **** 12.0 % **** 0.00 **** 5.6 % **** 4,799. **** 4,799. $ /w/mo Expense **** 50.0000 **** 50.0000 **** 10.00 **** 698.361
Gas Rate **** 17,399. **** 7,796. Mcf/mo **** 12.0 % **** 0.00 **** 5.6 % Revenue **** 15.00 **** 630.794
GOR **** 17,800. **** 17,800. scf/bbl Oil **** 50.0000 **** 50.0000 **** 20.00 **** 576.002
Gas Shrinkage **** 0.0 **** 0.0 % Gas **** 50.0000 **** 50.0000 **** 25.00 **** 530.841
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 493.078
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API:     CODE:
--- ---
PROPNUM: NEW165 12 Months in first year
9.667 Year Life (09/2030)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 165 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 79

Cawley, Gillespie & Associates, Inc.

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Table 80

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (SAN ANGELO-MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 1.749
**** 12-2022 **** 1.362
**** 12-2023 **** 1.066
**** 12-2024 **** 0.832
**** 12-2025 **** 0.643
**** 12-2026 **** 0.487
**** 12-2027 **** 0.356
**** 12-2028 **** 0.245
**** 12-2029 **** 0.150
**** 12-2030 **** 0.067
**** 12-2031 **** 0.006
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 6.963
**** After **** 0.000
**** Total **** 6.963
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM WellsGross    Net<br>Count OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 2.0 .0
**** 12-2022 **** 2.0 .0
**** 12-2023 **** 2.0 .0
**** 12-2024 **** 2.0 .0
**** 12-2025 **** 2.0 .0
**** 12-2026 **** 2.0 .0
**** 12-2027 **** 2.0 .0
**** 12-2028 **** 2.0 .0
**** 12-2029 **** 2.0 .0
**** 12-2030 **** 2.0 .0
**** 12-2031 **** 2.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 355.376
Oil Rate **** 678. **** 228. bbls/mo **** 15.8 % **** 0.00 **** 6.7 % **** 4,799. **** 4,799. $ /w/mo Expense **** 50.0000 **** 50.0000 **** 10.00 **** 316.048
Gas Rate **** 2,557. **** 831. Mcf/mo **** 16.1 % **** 0.00 **** 7.0 % Revenue **** 15.00 **** 284.981
GOR **** 3,770. **** 3,630. scf/bbl Oil **** 50.0000 **** 50.0000 **** 20.00 **** 259.943
Gas Shrinkage **** 0.0 **** 0.0 % Gas **** 50.0000 **** 50.0000 **** 25.00 **** 239.408
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 222.304
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210302333    CODE: 100,103,
--- ---
PROPNUM: L8BFQFQC00 12 Months in first year
10.417 Year Life (06/2031)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 80 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 80

Cawley, Gillespie & Associates, Inc.

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Table 81

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL SEC 20 43

SAND HILLS (ORDOVICIAN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM WellsGross    Net<br>Count OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210381026    CODE: 100,103,
--- ---
PROPNUM: L8BFQFSC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 81 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 81

Cawley, Gillespie & Associates, Inc.

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Table 82

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

SAND HILLS (ORDOVICIAN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross Oil<br>Production<br>MBBLS Gross Gas<br>Production<br>MMCF Net Oil<br>Production<br>MBBLS Net Gas<br>Sales<br>MMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 8,358.4 **** 7,241.0
**** Ult **** 8,358.4 **** 7,241.0

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 40.6250 **** 40.6250 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 40.6250 **** 40.6250 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210302312    CODE: 100,103,
--- ---
PROPNUM: L8BFQFTC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 82 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 82

Cawley, Gillespie & Associates, Inc.

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Table 83

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (SAN ANGELO UPPER) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210330160    CODE:<br>242-080-
--- ---
PROPNUM: L8BFQF0C00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 86 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 83

Cawley, Gillespie & Associates, Inc.

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Table 84

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (SAN ANGELO UPPER) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 6.894
**** 12-2022 **** 5.199
**** 12-2023 **** 3.623
**** 12-2024 **** 2.157
**** 12-2025 **** 0.794
**** 12-2026 **** 0.008
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 18.674
**** After **** 0.000
**** Total **** 18.674
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 41.0 **** .0
**** 12-2022 **** 41.0 **** .0
**** 12-2023 **** 41.0 **** .0
**** 12-2024 **** 41.0 **** .0
**** 12-2025 **** 41.0 **** .0
**** 12-2026 **** 41.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 1,160.834
Oil Rate **** 5,768. **** 4,013. bbls/mo **** 7.0 % **** 0.00 **** 7.0 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 1,080.437
Gas Rate **** 37,636. **** 26,183. Mcf/mo **** 7.0 % **** 0.00 **** 7.0 % **** Revenue **** 15.00 **** 1,011.472
GOR **** 6,520. **** 6,520. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 951.769
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 899.655
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 853.824
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210302307    CODE: 100,103,
--- ---
PROPNUM: L8BFQFWC00 12 Months in first year
5.083 Year Life (01/2026)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 85 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 84

Cawley, Gillespie & Associates, Inc.

LOGO

Table 85

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (WICHITA ALBANY) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 1.613
**** 12-2022 **** 1.127
**** 12-2023 **** 0.713
**** 12-2024 **** 0.356
**** 12-2025 **** 0.062
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 3.871
**** After **** 0.000
**** Total **** 3.871
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 10.0 **** .0
**** 12-2022 **** 10.0 **** .0
**** 12-2023 **** 10.0 **** .0
**** 12-2024 **** 10.0 **** .0
**** 12-2025 **** 10.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 261.480
Gas Rate **** 9,974. **** 6,527. Mcf/mo **** 10.1 % **** 0.00 **** 8.0 % **** 4,291. **** 4,291. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 245.342
Oil Rate **** 1,236. **** 809. bbls/mo **** 10.1 % **** 0.00 **** 8.0 % **** Revenue **** 15.00 **** 231.344
Yield **** 124. **** 124. bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 219.103
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 208.317
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 198.749
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210302061    CODE: 200,103,
--- ---
PROPNUM: L8BFQF1C00 12 Months in first year
4.667 Year Life (09/2025)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 87 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 85

Cawley, Gillespie & Associates, Inc.

LOGO

Table 86

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (WICHITA ALBANY) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.531
**** 12-2022 **** 0.375
**** 12-2023 **** 0.251
**** 12-2024 **** 0.150
**** 12-2025 **** 0.068
**** 12-2026 **** 0.008
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 1.383
**** After **** 0.000
**** Total **** 1.383
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 1.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 66.030
Oil Rate **** 270. **** 128. **** bbls/mo **** 15.5 % **** 0.00 **** 10.7 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 61.468
Gas Rate **** 472. **** 225. **** Mcf/mo **** 15.5 % **** 0.00 **** 10.7 % **** Revenue **** 15.00 **** 57.567
GOR **** 1,740. **** 1,740. **** scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 54.198
Gas Shrinkage **** 0.0 **** 0.0 **** % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 51.264
Oil Severance **** 4.6 **** 4.6 **** % **** 30.00 **** 48.688
Gas Severance **** 5.3 **** 5.3 **** %
Ad Valorem **** 3.4 **** %
API: 4210302014    CODE: 100,103,
--- ---
PROPNUM: L8BFQGHC00 12Months in first year
5.500 Year Life (07/2026)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 103 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 86

Cawley, Gillespie & Associates, Inc.

LOGO

Table 87

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (WOJCIK-MCELROY) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net Oil<br>Production<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
Net
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 0000000000    CODE: MCELGASP
--- ---
PROPNUM: L8BFQGTC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 114 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 87

Cawley, Gillespie & Associates, Inc.

LOGO

Table 88

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR C

SAND HILLS (WOJCIK-MCELROY) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net Oil<br>Production<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
Net
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210335249    CODE:
--- ---
PROPNUM: L8BFQHFB00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 140 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 88

Cawley, Gillespie & Associates, Inc.

LOGO

Table 89

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net Oil<br>Production<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
Net
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210302370    CODE: 100,103,
--- ---
PROPNUM: L8BFQFOC00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 88 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 89

Cawley, Gillespie & Associates, Inc.

LOGO

Table 90

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net Oil<br>Production<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
Net
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 0000000000    CODE: 201,000,
--- ---
PROPNUM: L8BFQG6B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 95 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 90

Cawley, Gillespie & Associates, Inc.

LOGO

Table 91

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

SAND HILLS EAST (ELLENBURGER) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross Gas<br>Production<br>MMCF Net Oil<br>Production<br>MBBLS Net Gas<br>Sales<br>MMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 4.5 **** 6.2 0.502 **** 0.678
**** 12-2022 **** 4.2 **** 5.8 0.378 **** 0.508
**** 12-2023 **** 3.9 **** 5.3 0.265 **** 0.352
**** 12-2024 **** 3.6 **** 4.9 0.159 **** 0.207
**** 12-2025 **** 3.3 **** 4.6 0.062 **** 0.073
**** 12-2026 **** 0.5 **** 0.7 0.001 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 0.000 **** 0.000
**** S Tot **** 20.1 **** 27.6 1.367 **** 1.818
**** After **** 0.0 **** 0.0 0.000 **** 0.000
**** Total **** 20.1 **** 27.6 1.367 **** 1.818
**** Cum **** 597.7 **** 523.1
**** Ult **** 617.8 **** 550.7

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 2.0 **** .0
**** 12-2022 **** 2.0 **** .0
**** 12-2023 **** 2.0 **** .0
**** 12-2024 **** 2.0 **** .0
**** 12-2025 **** 2.0 **** .0
**** 12-2026 **** 2.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 63.494
Oil Rate **** 392. **** 263. **** bbls/mo **** 7.5 % **** 0.00 **** 7.5 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 59.046
Gas Rate **** 539. **** 362. **** Mcf/mo **** 7.5 % **** 0.00 **** 7.5 % **** Revenue **** 15.00 **** 55.236
GOR **** 1,370. **** 1,370. **** scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 51.942
Gas Shrinkage **** 0.0 **** 0.0 **** % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 49.070
Oil Severance **** 4.6 **** 4.6 **** % **** 30.00 **** 46.547
Gas Severance **** 5.3 **** 5.3 **** %
Ad Valorem **** 3.4 **** %
API: MIN      CODE: 200,000,020914A
--- ---
PROPNUM: L8BFQFDB00 12 Months in first year
5.167 Year Life (03/2026)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 89 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 91

Cawley, Gillespie & Associates, Inc.

LOGO

Table 92

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I

SAND HILLS S (HOLT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProduction<br>MBBLS Gross GasProduction<br>MMCF Net OilProduction<br>MBBLS Net GasSales<br>MMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 0.000 **** 0.000
**** After **** 0.0 **** 0.0 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 0.000 **** 0.000
**** Cum **** 157.8 **** 0.0
**** Ult **** 157.8 **** 0.0

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. **** bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. **** Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. **** scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 **** % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 **** % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 **** %
Ad Valorem **** 0.0 **** %
API: 4210302293      CODE: 100,103,
--- ---
PROPNUM: L8BFQG3B00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 92 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 92

Cawley, Gillespie & Associates, Inc.

LOGO

Table 93

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS -- WADDELL WN ETAL TR A

SAND HILLS WEST (WOLFCAMP) FIELD -- CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net Oil<br>Production<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.011
**** 12-2022 **** 0.001
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.012
**** After **** 0.000
**** Total **** 0.012
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells<br>Gross     Net<br>Count OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 3.0 .0
**** 12-2022 **** 3.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 6.281
Oil Rate **** 36. **** 33. bbls/mo **** 7.0 % **** 0.00 **** 7.0 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 6.149
Gas Rate **** 5,953. **** 5,404. Mcf/mo **** 7.0 % **** 0.00 **** 7.0 % **** Revenue **** 15.00 **** 6.026
GOR **** 161,000. **** 161,000. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 5.912
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 5.806
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 5.706
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API:      CODE:
--- ---
PROPNUM: NEW167 12 Months in first year
1.417 Year Life (06/2022)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 167 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 93

Cawley, Gillespie & Associates, Inc.

Table 94

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS -- WADDELL WN ETAL TR A

SIMPSON (ELLENBURGER-TUBB) FIELD -- CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net Oil<br>Production<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells<br>Gross     Net<br>Count OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:       CODE:
--- ---
PROPNUM: RC7FJGH915 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 190 CGA2020    01/29/2021    16:31:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 94

Cawley, Gillespie & Associates, Inc.

LOGO

Table 95

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

WADDELL (WOLF-WICHITA A-TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice /BBL Avg GasPrice /MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API: 4210330754    CODE:
--- ---
PROPNUM: PBQMB3H9HB 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 178 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 95

Cawley, Gillespie & Associates, Inc.

LOGO

Table 96

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

WADDELL (MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 5.297
**** 12-2022 **** 3.828
**** 12-2023 **** 2.716
**** 12-2024 **** 1.854
**** 12-2025 **** 1.175
**** 12-2026 **** 0.629
**** 12-2027 **** 0.185
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 15.685
**** After **** 0.000
**** Total **** 15.685
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 6.0 **** .0
**** 12-2022 **** 6.0 **** .0
**** 12-2023 **** 6.0 **** .0
**** 12-2024 **** 6.0 **** .0
**** 12-2025 **** 6.0 **** .0
**** 12-2026 **** 6.0 **** .0
**** 12-2027 **** 6.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 870.527
Oil Rate **** 2,058. **** 652. bbls/mo **** 19.5 % **** 0.00 **** 12.2 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 799.954
Gas Rate **** 9,261. **** 2,934. Mcf/mo **** 19.5 % **** 0.00 **** 12.2 % **** Revenue **** 15.00 **** 740.992
GOR **** 4,500. **** 4,500. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 691.119
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 648.468
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 611.630
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210336122    CODE:
--- ---
PROPNUM: PBQMD441I4 12 Months in first year
7.000 Year Life (01/2028)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 179 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 96

Cawley, Gillespie & Associates, Inc.

LOGO

Table 97

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

WADDELL (WOLF-TUBB-S ANG-MCKN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenue M
**** 12-2021 **** 0.206
**** 12-2022 **** 0.167
**** 12-2023 **** 0.131
**** 12-2024 **** 0.099
**** 12-2025 **** 0.070
**** 12-2026 **** 0.044
**** 12-2027 **** 0.020
**** 12-2028 **** 0.002
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.739
**** After **** 0.000
**** Total **** 0.739
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 1.0 **** .0
**** 12-2027 **** 1.0 **** .0
**** 12-2028 **** 1.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 81.676
Gas Rate **** 2,291. 1,102. Mcf/mo **** 9.5 % **** 0.00 **** 9.5 % **** 4,291. **** 4,291. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 74.051
Oil Rate **** 99. **** 47. bbls/mo **** 9.5 % **** 0.00 **** 9.5 % **** Revenue **** 15.00 **** 67.780
Yield **** 43.3 **** 43.3 bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 62.551
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 58.138
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 54.373
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210336193    CODE:
--- ---
PROPNUM: PBQMEQJ8KI 12 Months in first year
7.417 Year Life (06/2028)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 180 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 97

Cawley, Gillespie & Associates, Inc.

LOGO

Table 98

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

WADDELL (WICHITA ALB-WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 13.689
**** 12-2022 **** 11.833
**** 12-2023 **** 10.357
**** 12-2024 **** 9.156
**** 12-2025 **** 8.160
**** 12-2026 **** 7.319
**** 12-2027 **** 6.601
**** 12-2028 **** 5.980
**** 12-2029 **** 5.438
**** 12-2030 **** 4.960
**** 12-2031 **** 4.537
**** 12-2032 **** 4.158
**** 12-2033 **** 3.818
**** 12-2034 **** 3.511
**** 12-2035 **** 3.231
**** S Tot **** 102.747
**** After **** 23.161
**** Total **** 125.908
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 6.0 **** .0
**** 12-2022 **** 6.0 **** .0
**** 12-2023 **** 6.0 **** .0
**** 12-2024 **** 6.0 **** .0
**** 12-2025 **** 6.0 **** .0
**** 12-2026 **** 6.0 **** .0
**** 12-2027 **** 6.0 **** .0
**** 12-2028 **** 6.0 **** .0
**** 12-2029 **** 6.0 **** .0
**** 12-2030 **** 6.0 **** .0
**** 12-2031 **** 6.0 **** .0
**** 12-2032 **** 6.0 **** .0
**** 12-2033 **** 6.0 **** .0
**** 12-2034 **** 6.0 **** .0
**** 12-2035 **** 6.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 5,308.290
Gas Rate **** 16,706. **** 2,493. Mcf/mo **** 12.7 % **** 0.00 **** 4.5 % **** 4,291. **** 4,291. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 4,096.223
Oil Rate **** 3,976. **** 593. bbls/mo **** 12.7 % **** 0.00 **** 4.5 % **** Revenue **** 15.00 **** 3,357.820
Yield **** 238. **** 238. bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 2,865.222
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 2,513.908
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 2,250.594
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210336184    CODE:
--- ---
PROPNUM: PBQMII49LG 12 Months in first year
32.167 Year Life (03/2053)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 181 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 98

Cawley, Gillespie & Associates, Inc.

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Table 99

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

WADDELL (WICHITA ALBANY) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br>Production Gross Gas<br>Production Net Oil<br><br><br>Production Net Gas<br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.373
**** 12-2022 **** 1.044
**** 12-2023 **** 0.794
**** 12-2024 **** 0.601
**** 12-2025 **** 0.448
**** 12-2026 **** 0.325
**** 12-2027 **** 0.225
**** 12-2028 **** 0.143
**** 12-2029 **** 0.074
**** 12-2030 **** 0.018
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 5.044
**** After **** 0.000
**** Total **** 5.044
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 1.0 **** .0
**** 12-2027 **** 1.0 **** .0
**** 12-2028 **** 1.0 **** .0
**** 12-2029 **** 1.0 **** .0
**** 12-2030 **** 1.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 281.758
Oil Rate **** 462. **** 104. bbls/mo **** 19.4 % **** 0.00 **** 10.5 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 252.677
Gas Rate **** 2,385. **** 540. Mcf/mo **** 19.4 % **** 0.00 **** 10.5 % **** Revenue **** 15.00 **** 229.410
GOR **** 5,150. **** 5,150. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 210.451
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 194.753
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 181.569
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210336361 CODE:
--- ---
PROPNUM: PBQMKC2ANU 12 Months in first year
9.833 Year Life (10/2030)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 182 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 99

Cawley, Gillespie & Associates, Inc.

LOGO

Table 100

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

WADDELL (MCKN-TUBB-WA-WC) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br>Production Gross Gas<br>Production Net Oil<br><br><br>Production Net Gas<br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 3.659
**** 12-2022 **** 3.288
**** 12-2023 **** 2.947
**** 12-2024 **** 2.633
**** 12-2025 **** 2.344
**** 12-2026 **** 2.079
**** 12-2027 **** 1.834
**** 12-2028 **** 1.609
**** 12-2029 **** 1.402
**** 12-2030 **** 1.212
**** 12-2031 **** 1.037
**** 12-2032 **** 0.876
**** 12-2033 **** 0.727
**** 12-2034 **** 0.591
**** 12-2035 **** 0.465
**** S Tot **** 26.704
**** After **** 0.797
**** Total **** 27.501
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 3.0 **** .0
**** 12-2022 **** 3.0 **** .0
**** 12-2023 **** 3.0 **** .0
**** 12-2024 **** 3.0 **** .0
**** 12-2025 **** 3.0 **** .0
**** 12-2026 **** 3.0 **** .0
**** 12-2027 **** 3.0 **** .0
**** 12-2028 **** 3.0 **** .0
**** 12-2029 **** 3.0 **** .0
**** 12-2030 **** 3.0 **** .0
**** 12-2031 **** 3.0 **** .0
**** 12-2032 **** 3.0 **** .0
**** 12-2033 **** 3.0 **** .0
**** 12-2034 **** 3.0 **** .0
**** 12-2035 **** 3.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 1,888.592
Oil Rate **** 1,110. **** 226. bbls/mo **** 8.0 % **** 0.00 **** 8.0 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 1,543.527
Gas Rate **** 13,773. **** 2,805. Mcf/mo **** 8.0 % **** 0.00 **** 8.0 % **** Revenue **** 15.00 **** 1,304.978
GOR **** 12,400. **** 12,400. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 1,132.374
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 1,002.671
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 902.096
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API:       CODE:
--- ---
PROPNUM: QASEG4LG39 12 Months in first year
19.167 Year Life (03/2040)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 189 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 100

Cawley, Gillespie & Associates, Inc.

LOGO

Table 101

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A 2044

WADDELL (MCKNIGHT-TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 2.0 **** 11.8 **** 0.296 **** 1.696
**** 12-2022 **** 1.7 **** 9.6 **** 0.163 **** 0.927
**** 12-2023 **** 1.4 **** 8.0 **** 0.063 **** 0.344
**** 12-2024 **** 0.3 **** 1.8 **** 0.003 **** 0.011
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 5.4 **** 31.2 0.525 **** 2.978
**** After **** 0.0 **** 0.0 0.000 **** 0.000
**** Total **** 5.4 **** 31.2 0.525 **** 2.978
**** Cum **** 2.2 **** 6.5
**** Ult **** 7.6 **** 37.7

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 32.577
Oil Rate **** 186. 102.bbls/mo **** 19.5 % **** 0.00 **** 15.3 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 31.147
Gas Rate **** 1,078. **** 591. Mcf/mo **** 19.5 % **** 0.00 **** 15.3 % **** Revenue **** 15.00 **** 29.872
GOR **** 5,780. **** 5,780. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 28.727
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 27.693
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 26.756
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210336337      CODE:
--- ---
PROPNUM: VBJHAEXB2F 12 Months in first year
3.250 Year Life (04/2024)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 198 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 101

Cawley, Gillespie & Associates, Inc.

LOGO

Table 102

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR A

WADDELL (WOLFCAMP-TUBB-SA-MCK) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSales<br>MMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 13.7 **** 107.0 **** 3.773 **** 29.326
**** 12-2022 **** 11.5 **** 89.3 **** 2.954 **** 22.945
**** 12-2023 **** 9.6 **** 74.6 **** 2.270 **** 17.616
**** 12-2024 **** 8.0 **** 62.3 **** 1.699 **** 13.167
**** 12-2025 **** 6.7 **** 52.0 **** 1.222 **** 9.452
**** 12-2026 **** 5.6 **** 43.4 **** 0.824 **** 6.350
**** 12-2027 **** 4.7 **** 36.3 **** 0.491 **** 3.760
**** 12-2028 **** 3.9 **** 30.3 **** 0.214 **** 1.597
**** 12-2029 **** 1.4 **** 11.1 **** 0.018 **** 0.114
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 65.0 **** 506.4 **** 13.465 **** 104.329
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 65.0 **** 506.4 **** 13.465 **** 104.329
**** Cum **** 178.2 **** 931.7
**** Ult **** 243.2 **** 1,438.0

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 3.0 **** .0
**** 12-2022 **** 3.0 **** .0
**** 12-2023 **** 3.0 **** .0
**** 12-2024 **** 3.0 **** .0
**** 12-2025 **** 3.0 **** .0
**** 12-2026 **** 3.0 **** .0
**** 12-2027 **** 3.0 **** .0
**** 12-2028 **** 3.0 **** .0
**** 12-2029 **** 3.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 867.329
Oil Rate **** 1,241. **** 276. bbls/mo **** 16.5 % 0.00 16.5% **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 783.641
Gas Rate **** 9,672. **** 2,152. Mcf/mo **** 16.5 % 0.00 16.5% **** Revenue **** 15.00 **** 715.505
GOR **** 7,790. **** 7,790. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 659.172
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 611.957
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 571.901
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210336193      CODE:
--- ---
PROPNUM: PBQLT55RAO 12 Months in first year
8.417 Year Life (06/2029)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 175 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 102

Cawley, Gillespie & Associates, Inc.

Table 103

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR A

WADDELL (TUBB-S ANGELO-MCKN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProduction<br>MMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 10.9 **** 65.9 2.769 **** 16.723
**** 12-2022 **** 9.4 **** 57.2 2.250 **** 13.581
**** 12-2023 **** 8.3 **** 50.5 1.853 **** 11.173
**** 12-2024 **** 7.5 **** 45.2 1.538 **** 9.268
**** 12-2025 **** 6.8 **** 41.0 1.283 **** 7.723
**** 12-2026 **** 6.2 **** 37.4 1.072 **** 6.445
**** 12-2027 **** 5.7 **** 34.5 0.895 **** 5.371
**** 12-2028 **** 5.3 **** 31.9 0.744 **** 4.454
**** 12-2029 **** 4.9 **** 29.7 0.613 **** 3.663
**** 12-2030 **** 4.6 **** 27.8 0.499 **** 2.974
**** 12-2031 **** 4.3 **** 26.1 0.399 **** 2.368
**** 12-2032 **** 4.1 **** 24.7 0.311 **** 1.831
**** 12-2033 **** 3.8 **** 23.3 0.232 **** 1.351
**** 12-2034 **** 3.7 **** 22.1 0.161 **** 0.921
**** 12-2035 **** 3.5 **** 21.1 0.096 **** 0.532
**** S Tot **** 88.8 **** 538.4 14.714 **** 88.379
**** After **** 3.9 **** 23.3 0.039 **** 0.177
**** Total **** 92.7 **** 561.8 14.753 **** 88.556
**** Cum **** 126.1 **** 884.3
**** Ult **** 218.8 **** 1,446.1

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
EndMo-Year ProductionTaxesM Ad ValoremTaxesM Wells<br>Gross    Net<br>Count OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 3.0 .0
**** 12-2022 **** 3.0 .0
**** 12-2023 **** 3.0 .0
**** 12-2024 **** 3.0 .0
**** 12-2025 **** 3.0 .0
**** 12-2026 **** 3.0 .0
**** 12-2027 **** 3.0 .0
**** 12-2028 **** 3.0 .0
**** 12-2029 **** 3.0 .0
**** 12-2030 **** 3.0 .0
**** 12-2031 **** 3.0 .0
**** 12-2032 **** 3.0 .0
**** 12-2033 **** 3.0 .0
**** 12-2034 **** 3.0 .0
**** 12-2035 **** 3.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 806.301
Gas Rate **** 5,886. **** 1,626. Mcf/mo **** 14.9 % **** 0.00 **** 4.5 % **** 4,291. **** 4,291. $ /w/mo Expense **** 50.0000 **** 50.0000 **** 10.00 **** 686.739
Oil Rate **** 971. **** 268. bbls/mo **** 14.9 % **** 0.00 **** 4.5 % Revenue **** 15.00 **** 599.448
Yield **** 165. **** 165. bbl/MMcf Oil **** 50.0000 **** 50.0000 **** 20.00 **** 533.421
Gas Shrinkage **** 0.0 **** 0.0 % Gas **** 50.0000 **** 50.0000 **** 25.00 **** 481.967
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 440.851
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %
API: 4210336123    CODE:
--- ---
PROPNUM: PBQM9A72FV 12 Months in first year
16.167 Year Life (03/2037)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 177 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 103

Cawley, Gillespie & Associates, Inc.

LOGO

Table 104

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR A

WADDELL (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br>Production Gross Gas<br>Production Net Oil<br><br><br>Production Net Gas<br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
Yield **** 0.0 **** 0.0 bbl/MMcf **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:       CODE:
--- ---
PROPNUM: SC1MDBBP2Y 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 194 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 104

Cawley, Gillespie & Associates, Inc.

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Table 105

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR A

WADDELL RANCH (JUDKINS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross Oil<br>Production Gross Gas<br>Production Net Oil<br><br><br>Production Net Gas<br>Sales Avg Oil<br>Price Avg Gas<br>Price Oil<br>Revenue Gas<br>Revenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %
API:       CODE:
--- ---
PROPNUM: RC7FNH6D51 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 191 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 105

Cawley, Gillespie & Associates, Inc.

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Table 106

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR A

WADDELL RANCH (SAN ANGELO) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.107
**** 12-2022 **** 1.702
**** 12-2023 **** 1.362
**** 12-2024 **** 1.074
**** 12-2025 **** 0.826
**** 12-2026 **** 0.611
**** 12-2027 **** 0.423
**** 12-2028 **** 0.257
**** 12-2029 **** 0.109
**** 12-2030 **** 0.006
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 8.477
**** After **** 0.000
**** Total **** 8.477
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 6.0 **** .0
**** 12-2022 **** 6.0 **** .0
**** 12-2023 **** 6.0 **** .0
**** 12-2024 **** 6.0 **** .0
**** 12-2025 **** 6.0 **** .0
**** 12-2026 **** 6.0 **** .0
**** 12-2027 **** 6.0 **** .0
**** 12-2028 **** 6.0 **** .0
**** 12-2029 **** 6.0 **** .0
**** 12-2030 **** 6.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 562.480
Oil Rate **** 1,056. **** 525. **** bbls/mo **** 10.0 % **** 0.00 **** 5.5 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 502.071
Gas Rate **** 9,373. **** 4,657. **** Mcf/mo **** 10.0 % **** 0.00 **** 5.5 % **** Revenue **** 15.00 **** 453.791
GOR **** 8,870. **** 8,850. **** scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 414.516
Gas Shrinkage **** 0.0 **** 0.0 **** % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 382.063
Oil Severance **** 4.6 **** 4.6 **** % **** 30.00 **** 354.874
Gas Severance **** 5.3 **** 5.3 **** %
Ad Valorem **** 3.4 **** %
API: 4210335665 CODE:
PROPNUM: PBQM2R7ACI **** 12 **** Months in first year
**** 9.250 Year Life (04/2030)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 176 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 106

Cawley, Gillespie & Associates, Inc.

LOGO

Table 107

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR C

WADDELL RANCH (MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.805
**** 12-2022 **** 0.604
**** 12-2023 **** 0.452
**** 12-2024 **** 0.335
**** 12-2025 **** 0.240
**** 12-2026 **** 0.163
**** 12-2027 **** 0.099
**** 12-2028 **** 0.045
**** 12-2029 **** 0.005
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 2.749
**** After **** 0.000
**** Total **** 2.749
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 1.0 **** .0
**** 12-2027 **** 1.0 **** .0
**** 12-2028 **** 1.0 **** .0
**** 12-2029 **** 1.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 125.821
Oil Rate **** 340. **** 129. **** bbls/mo **** 16.6 % **** 0.00 **** 7.4 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 113.898
Gas Rate **** 548. **** 208. **** Mcf/mo **** 16.6 % **** 0.00 **** 7.4 % **** Revenue **** 15.00 **** 104.189
GOR **** 1,610. **** 1,610. **** scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 96.157
Gas Shrinkage **** 0.0 **** 0.0 **** % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 89.421
Oil Severance **** 4.6 **** 4.6 **** % **** 30.00 **** 83.702
Gas Severance **** 5.3 **** 5.3 **** %
Ad Valorem **** 3.4 **** %
API: CODE:
PROPNUM: RC7FP1WD60 **** 12 Months in first year
**** 8.500 Year Life (07/2029)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 192 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 107

Cawley, Gillespie & Associates, Inc.

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Table 108

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR A

WADDELL WEST (MCELROY-SAN ANGELO) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross Oil<br>Production<br>MBBLS Gross Gas<br>Production<br>MMCF Net Oil<br>Production<br>MBBLS Net Gas<br>Sales<br>MMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2022 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2023 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2024 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2025 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2026 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2027 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2028 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2029 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2030 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2031 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2032 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2033 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Cum **** 4.2 **** 0.0
**** Ult **** 4.2 **** 0.0

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
Net
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. **** bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. **** Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. **** scf/bbl **** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 **** % **** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 **** % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 **** %
Ad Valorem **** 0.0 **** %
API:    CODE:
--- ---
PROPNUM: NEWYE2013170 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 170 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 108

Cawley, Gillespie & Associates, Inc.

LOGO

Table 109

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN TR A

WADDELL WEST (TUBB-S ANGELO-MCKN) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross Oil<br>Production<br>MBBLS Gross Gas<br>Production<br>MMCF Net Oil<br>Production<br>MBBLS Net Gas<br>Sales<br>MMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 77.9 **** 429.2 **** 18.355 **** 100.750
**** 12-2022 **** 69.4 **** 382.6 **** 15.298 **** 83.905
**** 12-2023 **** 62.4 **** 343.9 **** 12.766 **** 69.950
**** 12-2024 **** 56.5 **** 311.5 **** 10.639 **** 58.233
**** 12-2025 **** 51.5 **** 284.0 **** 8.833 **** 48.277
**** 12-2026 **** 47.2 **** 260.3 **** 7.282 **** 39.731
**** 12-2027 **** 43.5 **** 239.8 **** 5.938 **** 32.327
**** 12-2028 **** 40.3 **** 222.0 **** 4.765 **** 25.863
**** 12-2029 **** 37.4 **** 206.2 **** 3.730 **** 20.158
**** 12-2030 **** 34.8 **** 191.7 **** 2.783 **** 14.942
**** 12-2031 **** 32.4 **** 178.3 **** 1.903 **** 10.091
**** 12-2032 **** 30.1 **** 165.8 **** 1.084 **** 5.579
**** 12-2033 **** 25.7 **** 141.8 **** 0.324 **** 1.421
**** 12-2034 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** 12-2035 **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** S Tot **** 609.1 **** 3,357.1 **** 93.701 **** 511.227
**** After **** 0.0 **** 0.0 **** 0.000 **** 0.000
**** Total **** 609.1 **** 3,357.1 **** 93.701 **** 511.227
**** Cum **** 963.3 **** 5,127.8
**** Ult **** 1,572.4 **** 8,484.9

All values are in US Dollars.

(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
Net
**** 12-2021 **** 22.0 .0
**** 12-2022 **** 22.0 .0
**** 12-2023 **** 22.0 .0
**** 12-2024 **** 22.0 .0
**** 12-2025 **** 22.0 .0
**** 12-2026 **** 22.0 .0
**** 12-2027 **** 22.0 .0
**** 12-2028 **** 22.0 .0
**** 12-2029 **** 22.0 .0
**** 12-2030 **** 22.0 .0
**** 12-2031 **** 22.0 .0
**** 12-2032 **** 22.0 .0
**** 12-2033 **** 22.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Interests Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 5,081.008
Oil Rate **** 6,854. **** 2,268. **** bbls/mo **** 11.7 % **** 0.00 **** 7.0 % **** 4,799. **** 4,799. $ /w/mo **** Expense **** 50.0000 **** 50.0000 **** 10.00 **** 4,386.620
Gas Rate **** 37,780. **** 12,504. **** Mcf/mo **** 11.7 % **** 0.00 **** 7.0 % **** Revenue **** 15.00 **** 3,862.818
GOR **** 5,510. **** 5,510. **** scf/bbl **** Oil **** 50.0000 **** 50.0000 **** 20.00 **** 3,456.909
Gas Shrinkage **** 0.0 **** 0.0 **** % **** Gas **** 50.0000 **** 50.0000 **** 25.00 **** 3,314.708
Oil Severance **** 4.6 **** 4.6 **** % **** 30.00 **** 2,873.704
Gas Severance **** 5.3 **** 5.3 **** %
Ad Valorem **** 3.4 **** %
API:    CODE:
--- ---
PROPNUM: NEWYE2013171 12 Months in first year
12.917 Year Life (12/2033)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 171 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 109

Cawley, Gillespie & Associates, Inc.

LOGO

Table 110

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Producing Reserves

CONOCOPHILLIPS — WADDELL WN ETAL TR I 620

Y SOUTH (TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Initial Final 5.00 0.000
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 0. **** 0. **** /w/mo Expense **** 40.6250 **** 40.6250 **** 10.00 **** 0.000
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % Revenue **** 15.00 **** 0.000
GOR **** 0. **** 0. scf/bbl Oil **** 40.6250 **** 40.6250 **** 20.00 **** 0.000
Gas Shrinkage **** 0.0 **** 0.0 % Gas **** 40.6250 **** 40.6250 **** 25.00 **** 0.000
Oil Severance **** 0.0 **** 0.0 % **** 30.00 **** 0.000
Gas Severance **** 0.0 **** 0.0 %
Ad Valorem **** 0.0 %

All values are in US Dollars.

API: 4210302069    CODE: 100,103,
PROPNUM: L8BFQGEB00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 101 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 110

Cawley, Gillespie & Associates, Inc.

Table I - PDNP

Composite of Reserve Estimates and Economic Forecasts

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Non-Producing Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** -18.209
**** 12-2022 **** 12.540
**** 12-2023 **** 10.443
**** 12-2024 **** 8.949
**** 12-2025 **** 7.830
**** 12-2026 **** 6.960
**** 12-2027 **** 6.250
**** 12-2028 **** 5.624
**** 12-2029 **** 5.062
**** 12-2030 **** 4.556
**** 12-2031 **** 4.100
**** 12-2032 **** 3.690
**** 12-2033 **** 3.322
**** 12-2034 **** 2.989
**** 12-2035 **** 2.690
**** S Tot **** 66.797
**** After **** 22.572
**** Total **** 89.368
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

SEC 12-31-2020 Benchmark Prices Percent Cum. Disc.
WTI Spot Henry Hub 5.00 1,070.7
Year Oil /STB Gas /MMBTU 10.00 396.8
**** 2021 **** 15.00 **** -1.3
**** Thereafter **** 20.00 **** -259.6
**** Cap **** 25.00 **** -438.0
**** 30.00 **** -566.6

All values are in US Dollars.

12 Months in first year
40.917 Year Life (12/2061)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO<br>THE CONDITIONS IN THE TEXT OF THE REPORT. 01/29/2021    16:31:27
--- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
Summary

Cawley, Gillespie & Associates, Inc.

Table II - PDNP

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Non-Producing Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start Current<br><br><br>Interest WellCntLife UltimateRecovery GrossReserves Net<br><br><br>Reserves Oil RevenueGas Revenue Prod TaxAdv. Tax Expenses<br>Investments Future Net<br>Cash Flow Cash Flow<br>Disc.@ 10.0
Table Class Major Well No. Date ASN % MBBL / MMCF M / M M / M M / M M M
WADDELL (GRAYBURG SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN EAST RANCH 37.5000 NI **** 0 **** 0.0 **** 0.0 **** 0.0
1 PDNP Oil 01/21 108 37.5000 WI **** 0.9 **** 0.0 **** 0.0 **** 0.0
SAND HILLS (SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 319.3 **** 319.3 **** 89.4
2 PDNP Oil 02/21 17 50.0000 WI **** 40.8 **** 550.8 **** 550.8 **** 136.1
WADDELL WN ETAL TR A 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0
3 PDNP Oil 01/21 163 50.0000 WI **** 0.9 **** 0.0 **** 0.0 **** 0.0
SAND HILLS (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL WEST 50.0000 NI **** 0 **** 0.0 **** 0.0 **** 0.0
4 PDNP Oil 01/21 109 50.0000 WI **** 0.9 **** 0.0 **** 0.0 **** 0.0
GRAND TOTAL **** 0 **** 319.3 **** 319.3 **** 89.4
**** 550.8 **** 550.8 **** 136.1

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020 1/29/2021 : 4:39:14 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.

Cawley, Gillespie & Associates, Inc.

Page  1

Rate-Time History-Forecast Curves

And

TabularReserves and Economics

By Property

Cawley, Gillespie & Associates, Inc.

Petroleum Consultants

LOGO

Table 1

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Non-Producing Reserves

BLACKBEARD OPERATING — WADDELL WN EEAST RANCH

WADDELL (GRAYBURG SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net Oil<br>Production<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 -274.114
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 3,561. **** 3,561. **** /w/mo Expense 37.5000 **** 37.5000 **** 10.00 **** -267.886
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 62,412. **** 62,412. **** /mo Revenue **** 15.00 **** -262.111
GOR **** 0. **** 0. scf/bbl Oil 37.5000 **** 37.5000 **** 20.00 **** -256.738
Gas Shrinkage **** 0.0 **** 0.0 % Gas 37.5000 **** 37.5000 **** 25.00 **** -251.723
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** -247.029
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API:  MIN    CODE:  100,103,
PROPNUM: L8BFQGNC00 12 Months in year ‘21
Start Date: 01/2021 1.000 Year Life (12/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 108 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDNP
Table 1

Cawley, Gillespie & Associates, Inc.

LOGO

Table 2

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Non-Producing Reserves

BLACKKBEARD OPERATING — WADDELL WN ETAL TR A

SAND HILLS (SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net Oil<br>Production<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** -18.209
**** 12-2022 **** 12.540
**** 12-2023 **** 10.443
**** 12-2024 **** 8.949
**** 12-2025 **** 7.830
**** 12-2026 **** 6.960
**** 12-2027 **** 6.250
**** 12-2028 **** 5.624
**** 12-2029 **** 5.062
**** 12-2030 **** 4.556
**** 12-2031 **** 4.100
**** 12-2032 **** 3.690
**** 12-2033 **** 3.322
**** 12-2034 **** 2.989
**** 12-2035 **** 2.690
**** S Tot **** 66.797
**** After **** 22.572
**** Total **** 89.368
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 2,759.101
Oil Rate **** 895. **** 10. bbls/mo **** 21.7 % **** 0.00 **** 10.0 % **** 3,452. **** 3,452. **** /w/mo Expense 50.0000 **** 50.0000 **** 10.00 **** 1,830.170
Gas Rate **** 2,192. **** 10. Mcf/mo **** 23.3 % **** 0.00 **** 10.1 % Revenue **** 15.00 **** 1,271.014
GOR **** 2,440. **** 1,000. scf/bbl Oil 50.0000 **** 50.0000 **** 20.00 **** 900.159
Gas Shrinkage **** 0.0 **** 0.0 % Gas 50.0000 **** 50.0000 **** 25.00 **** 637.625
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 442.984
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API:    CODE:  CGA173008
PROPNUM: L8BFQD1C00 11 Months in year ‘21
Start Date: 02/2021 40.834 Year Life (12/2061)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 17 CGA2020    01/29/2021    16:31:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDNP
Table 2

Cawley, Gillespie & Associates, Inc.

LOGO

Table 3

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Non-Producing Reserves

BLACKKBEARD OPERATING — WADDELL WN ETAL TR A

SAND HILLS (SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net Oil<br>Production<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 0.0 **** .0
**** 12-2022 **** 0.0 **** .0
**** 12-2023 **** 0.0 **** .0
**** 12-2024 **** 0.0 **** .0
**** 12-2025 **** 0.0 **** .0
**** 12-2026 **** 0.0 **** .0
**** 12-2027 **** 0.0 **** .0
**** 12-2028 **** 0.0 **** .0
**** 12-2029 **** 0.0 **** .0
**** 12-2030 **** 0.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 -901.620
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 4,552. **** 4,552. **** /w/mo Expense 50.0000 **** 50.0000 **** 10.00 **** -880.990
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 62,412. **** 62,412. **** /mo Revenue **** 15.00 **** -861.776
GOR **** 0. **** 0. scf/bbl Oil 50.0000 **** 50.0000 **** 20.00 **** -843.825
Gas Shrinkage **** 0.0 **** 0.0 % Gas 50.0000 **** 50.0000 **** 25.00 **** -827.006
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** -811.205
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API:    CODE:  CGA103163
PROPNUM: N1GKDPUE5R 12 Months in year ‘21
Start Date: 01/2021 1.000 Year Life (12/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 163 CGA2020    01/29/2021    16:31:27
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDNP
Table 3

Cawley, Gillespie & Associates, Inc.

LOGO

Table 4

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Developed Non-Producing Reserves

BLACKBEARD OPERATING — WADDELL WN ETAL WEST RANCH

SAND HILLS (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End<br>Mo-Year ProductionTaxesM Ad ValoremTaxesM Wells<br>Gross    Net<br>Count OperatingExpenseM OtherDeductionsM InvestmentM Future NetCash FlowM CumulativeCash FlowM Cum.Cash FlowDisc.@ 10.0%M
**** 12-2021 **** 0.0 .0
**** 12-2022 **** 0.0 .0
**** 12-2023 **** 0.0 .0
**** 12-2024 **** 0.0 .0
**** 12-2025 **** 0.0 .0
**** 12-2026 **** 0.0 .0
**** 12-2027 **** 0.0 .0
**** 12-2028 **** 0.0 .0
**** 12-2029 **** 0.0 .0
**** 12-2030 **** 0.0 .0
**** 12-2031 **** 0.0 .0
**** 12-2032 **** 0.0 .0
**** 12-2033 **** 0.0 .0
**** 12-2034 **** 0.0 .0
**** 12-2035 **** 0.0 .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 -155.713
Oil Rate **** 0. **** 0. bbls/mo **** 0.0 % **** 0.00 **** 0.0 % **** 3,561. **** 3,561. **** /w/mo Expense 50.0000 **** 50.0000 **** 10.00 **** -152.175
Gas Rate **** 0. **** 0. Mcf/mo **** 0.0 % **** 0.00 **** 0.0 % **** 26,590. **** 26,590. **** /mo Revenue **** 15.00 **** -148.895
GOR **** 0. **** 0. scf/bbl Oil 50.0000 **** 50.0000 **** 20.00 **** -145.843
Gas Shrinkage **** 0.0 **** 0.0 % Gas 50.0000 **** 50.0000 **** 25.00 **** -142.994
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** -140.327
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API: MIN    CODE:
PROPNUM: L8BFQGPC00 12 Months in year ‘21
Start Date: 01/2021         1.000 Year Life (12/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 109 CGA2020    01/29/2021    16:31:27
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDNP
Table 4

Cawley, Gillespie & Associates, Inc.

Table I - PUD

Composite of Reserve Estimates and Economic Forecasts

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Undeveloped Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** -414.113
**** 12-2022 **** 196.065
**** 12-2023 **** 156.044
**** 12-2024 **** 127.431
**** 12-2025 **** 105.912
**** 12-2026 **** 89.106
**** 12-2027 **** 75.361
**** 12-2028 **** 63.252
**** 12-2029 **** 52.342
**** 12-2030 **** 42.585
**** 12-2031 **** 34.434
**** 12-2032 **** 27.227
**** 12-2033 **** 20.729
**** 12-2034 **** 14.866
**** 12-2035 **** 9.675
**** S Tot **** 600.916
**** After **** 14.394
**** Total **** 615.310
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 39.8 **** .0
**** 12-2022 **** 91.0 **** .0
**** 12-2023 **** 91.0 **** .0
**** 12-2024 **** 91.0 **** .0
**** 12-2025 **** 91.0 **** .0
**** 12-2026 **** 91.0 **** .0
**** 12-2027 **** 91.0 **** .0
**** 12-2028 **** 91.0 **** .0
**** 12-2029 **** 91.0 **** .0
**** 12-2030 **** 91.0 **** .0
**** 12-2031 **** 75.0 **** .0
**** 12-2032 **** 75.0 **** .0
**** 12-2033 **** 75.0 **** .0
**** 12-2034 **** 75.0 **** .0
**** 12-2035 **** 71.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

SEC 12-31-2020 Benchmark Prices Percent Cum. Disc.
Year WTI SpotOil /STB Henry HubGas /MMBTU 5.00 15,986.4
10.00 10,239.5 ****
2021 **** 15.00 **** 6,185.9
Thereafter **** 20.00 **** 3,220.6
Cap **** 25.00 **** 986.4
**** 30.00 **** -738.1

All values are in US Dollars.

12 Months in first year
27.917 Year Life (12/2048)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. 01/29/2021    16:31:27
--- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
Summary

Cawley, Gillespie & Associates, Inc.

LOGO

Table II - PUD

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Undeveloped Reserves

Certain Crane County, Texas Properties

As of December 31, 2020

LEASE NAME Start CurrentInterest WellCntLife UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL/MMCF M / M M / M M / M M M
SAND HILLS (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 13 **** 317.7 **** 317.7 **** 31.7
1 PUD Oil 02/21 29 50.0000 WI **** 9.4 **** 752.7 **** 752.7 **** 73.3
SAND HILLS — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR I 40.6250 NI **** 4 **** 177.0 **** 177.0 **** 16.4
2 PUD Oil 11/21 141 40.6250 WI **** 13.1 **** 433.7 **** 433.7 **** 39.5
WADDELL WN ETAL WEST 50.0000 NI **** 3 **** 82.2 **** 82.2 **** 13.2
3 PUD Oil 02/21 162 50.0000 WI **** 9.5 **** 201.3 **** 201.3 **** 32.0
SAND HILLS (WOLFCAMP) — CRANE COUNTY, TEXAS
WADDELL WN ETAL TR A 50.0000 NI **** 64 **** 4,101.7 **** 4,101.7 **** 463.9
4 PUD Oil 02/21 58 50.0000 WI **** 16.1 **** 9,721.7 **** 9,721.7 **** 1,063.9
WADDELL WN ETAL TR AB 25.0000 NI **** 1 **** 66.2 **** 66.2 **** 4.7
5 PUD Oil 06/21 60 25.0000 WI **** 15.9 **** 153.9 **** 153.9 **** 10.7
WADDELL WN ETAL TR H 50.0000 NI **** 1 **** 66.2 **** 66.2 **** 9.1
6 PUD Oil 10/21 70 50.0000 WI **** 15.9 **** 153.9 **** 153.9 **** 20.5
WADDELL WN ETAL TR D 50.0000 NI **** 1 **** 66.2 **** 66.2 **** 9.1
7 PUD Oil 09/21 18 50.0000 WI **** 15.9 **** 153.5 **** 153.5 **** 20.4
WADDELL (GRAYBURG SAN ANDRES) — CRANE COUNTY, TEXAS
WADDELL WN TR 1 37.5000 NI **** 2 **** 214.9 **** 214.9 **** 33.7
8 PUD Oil 03/21 147 37.5000 WI **** 27.7 **** 214.9 **** 214.9 **** 33.5
WADDELL WN TR 3 37.5000 NI **** 2 **** 214.9 **** 214.9 **** 33.7
9 PUD Oil 03/21 83 37.5000 WI **** 27.7 **** 214.9 **** 214.9 **** 33.5
GRAND TOTAL **** 91 **** 5,307.1 **** 5,307.1 **** 615.3
**** 12,000.6 **** 12,000.6 **** 1,327.4

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: CGA2020    1/29/2021 : 4:39:14 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.
Cawley, Gillespie & Associates, Inc.
Page 1

Rate-Time History-Forecast Curves

And

TabularReserves and Economics

By Property

Cawley, Gillespie & Associates, Inc.

Petroleum Consultants

LOGO

Table 1

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Undeveloped Reserves

BLACKBEARD OPERATING — WADDELL WN ETAL TR A

SAND HILLS (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** -11.323
**** 12-2022 **** 12.477
**** 12-2023 **** 9.225
**** 12-2024 **** 6.905
**** 12-2025 **** 5.165
**** 12-2026 **** 3.809
**** 12-2027 **** 2.702
**** 12-2028 **** 1.726
**** 12-2029 **** 0.847
**** 12-2030 **** 0.123
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 31.656
**** After **** 0.000
**** Total **** 31.656
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 6.2 **** .0
**** 12-2022 **** 13.0 **** .0
**** 12-2023 **** 13.0 **** .0
**** 12-2024 **** 13.0 **** .0
**** 12-2025 **** 13.0 **** .0
**** 12-2026 **** 13.0 **** .0
**** 12-2027 **** 13.0 **** .0
**** 12-2028 **** 13.0 **** .0
**** 12-2029 **** 13.0 **** .0
**** 12-2030 **** 13.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 1,360.106
Oil Rate **** 1,385. **** 1,616. bbls/mo **** 21.7 % **** 0.00 **** 10.0 % **** 4,799. **** 4,799. **** /w/mo Expense 50.0000 **** 50.0000 **** 10.00 **** 1,098.780
Gas Rate **** 3,393. **** 3,655. Mcf/mo **** 22.4 % **** 0.00 **** 10.8 % Revenue **** 15.00 **** 893.073
GOR **** 2,440. **** 2,260. scf/bbl Oil 50.0000 **** 50.0000 **** 20.00 **** 728.334
Gas Shrinkage **** 0.0 **** 0.0 % Gas 50.0000 **** 50.0000 **** 25.00 **** 594.388
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 484.010
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API:    CODE:
PROPNUM: 11 Months in year ’21
Start Date: 02/2021     9.500 Year Life (07/2030)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 29 CGA2020    01/29/2021    16:31:27
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PUD
Table 1

Cawley, Gillespie & Associates, Inc.

LOGO

Table 2

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Undeveloped Reserves

BLACKBEARD OPERATING — WADDELL WN ETAL TR I

SAND HILLS FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** -11.643
**** 12-2022 **** 6.158
**** 12-2023 **** 4.758
**** 12-2024 **** 3.781
**** 12-2025 **** 3.060
**** 12-2026 **** 2.506
**** 12-2027 **** 2.066
**** 12-2028 **** 1.686
**** 12-2029 **** 1.345
**** 12-2030 **** 1.037
**** 12-2031 **** 0.761
**** 12-2032 **** 0.512
**** 12-2033 **** 0.288
**** 12-2034 **** 0.087
**** 12-2035 **** 0.000
**** S Tot **** 16.402
**** After **** 0.000
**** Total **** 16.402
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 4.0 **** .0
**** 12-2022 **** 4.0 **** .0
**** 12-2023 **** 4.0 **** .0
**** 12-2024 **** 4.0 **** .0
**** 12-2025 **** 4.0 **** .0
**** 12-2026 **** 4.0 **** .0
**** 12-2027 **** 4.0 **** .0
**** 12-2028 **** 4.0 **** .0
**** 12-2029 **** 4.0 **** .0
**** 12-2030 **** 4.0 **** .0
**** 12-2031 **** 4.0 **** .0
**** 12-2032 **** 4.0 **** .0
**** 12-2033 **** 4.0 **** .0
**** 12-2034 **** 4.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 620.718
Oil Rate **** 2,573. **** 490. bbls/mo **** 21.7 % **** 0.00 **** 10.0 % **** 4,799. **** 4,799. **** /w/mo Expense 40.6250 **** 40.6250 **** 10.00 **** 435.305
Gas Rate **** 6,304. **** 1,200. Mcf/mo **** 21.7 % **** 0.00 **** 10.0 % Revenue **** 15.00 **** 301.481
GOR **** 2,450. **** 2,450. scf/bbl Oil 40.6250 **** 40.6250 **** 20.00 **** 202.389
Gas Shrinkage **** 0.0 **** 0.0 % Gas 40.6250 **** 40.6250 **** 25.00 **** 127.414
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 69.644
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API:    CODE:
PROPNUM: L8BFQHHC00 2 Months in year ‘21
Start Date: 11/2021     13.167 Year Life (12/2034)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 141 CGA2020    01/29/2021    16:31:27
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PUD
Table 2

Cawley, Gillespie & Associates, Inc.

LOGO

Table 3

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Undeveloped Reserves

BLACKBEARD OPERATING — WADDELL WN ETAL WEST RANCH

SAND HILLS FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.640
**** 12-2022 **** 3.186
**** 12-2023 **** 2.291
**** 12-2024 **** 1.678
**** 12-2025 **** 1.233
**** 12-2026 **** 0.894
**** 12-2027 **** 0.628
**** 12-2028 **** 0.405
**** 12-2029 **** 0.205
**** 12-2030 **** 0.035
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 13.194
**** After **** 0.000
**** Total **** 13.194
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 3.0 **** .0
**** 12-2022 **** 3.0 **** .0
**** 12-2023 **** 3.0 **** .0
**** 12-2024 **** 3.0 **** .0
**** 12-2025 **** 3.0 **** .0
**** 12-2026 **** 3.0 **** .0
**** 12-2027 **** 3.0 **** .0
**** 12-2028 **** 3.0 **** .0
**** 12-2029 **** 3.0 **** .0
**** 12-2030 **** 3.0 **** .0
**** 12-2031 **** 0.0 **** .0
**** 12-2032 **** 0.0 **** .0
**** 12-2033 **** 0.0 **** .0
**** 12-2034 **** 0.0 **** .0
**** 12-2035 **** 0.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 623.400
Oil Rate **** 789. **** 368. bbls/mo **** NA **** 0.00 **** 10.0 % **** 4,799. **** 4,799. **** /w/mo Expense 50.0000 **** 50.0000 **** 10.00 **** 552.993
Gas Rate **** 1,933. **** 902. Mcf/mo **** NA **** 0.00 **** 10.0 % Revenue **** 15.00 **** 496.518
GOR **** 2,450. **** 2,450. scf/bbl Oil 50.0000 **** 50.0000 **** 20.00 **** 450.392
Gas Shrinkage **** 0.0 **** 0.0 % Gas 50.0000 **** 50.0000 **** 25.00 **** 412.117
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 379.908
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API:    CODE: CGA103162
PROPNUM: N1GK26EC4S 11 Months in year ‘21
Start Date: 02/2021     9.584 Year Life (09/2030)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 162 CGA2020    01/29/2021    16:31:27
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PUD
Table 3

Cawley, Gillespie & Associates, Inc.

LOGO

Table 4

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Undeveloped Reserves

BLACKBEARD OPERATING — WADDELL WN ETAL TR A

SAND HILLS (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** -374.839
**** 12-2022 **** 159.931
**** 12-2023 **** 127.470
**** 12-2024 **** 104.327
**** 12-2025 **** 86.982
**** 12-2026 **** 73.491
**** 12-2027 **** 62.480
**** 12-2028 **** 52.781
**** 12-2029 **** 44.050
**** 12-2030 **** 36.189
**** 12-2031 **** 29.112
**** 12-2032 **** 22.739
**** 12-2033 **** 17.000
**** 12-2034 **** 11.833
**** 12-2035 **** 7.179
**** S Tot **** 460.723
**** After **** 3.129
**** Total **** 463.852
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 19.6 **** .0
**** 12-2022 **** 64.0 **** .0
**** 12-2023 **** 64.0 **** .0
**** 12-2024 **** 64.0 **** .0
**** 12-2025 **** 64.0 **** .0
**** 12-2026 **** 64.0 **** .0
**** 12-2027 **** 64.0 **** .0
**** 12-2028 **** 64.0 **** .0
**** 12-2029 **** 64.0 **** .0
**** 12-2030 **** 64.0 **** .0
**** 12-2031 **** 64.0 **** .0
**** 12-2032 **** 64.0 **** .0
**** 12-2033 **** 64.0 **** .0
**** 12-2034 **** 64.0 **** .0
**** 12-2035 **** 64.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 15,692.103
Oil Rate **** 13,856. **** 8,009. bbls/mo **** 21.7 % **** 0.00 **** 10.0 % **** 4,799. **** 4,799. **** /w/mo Expense 50.0000 **** 50.0000 **** 10.00 **** 9,452.087
Gas Rate **** 33,939. **** 17,884. Mcf/mo **** 22.2 % **** 0.00 **** 10.5 % Revenue **** 15.00 **** 5,031.361
GOR **** 2,440. **** 2,230. scf/bbl Oil 50.0000 **** 50.0000 **** 20.00 **** 1,794.227
Gas Shrinkage **** 0.0 **** 0.0 % Gas 50.0000 **** 50.0000 **** 25.00 **** -642.642
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** -2,520.038
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API:    CODE:
PROPNUM: 11 Months in year ‘21
Start Date: 02/2021     16.167 Year Life (03/2037)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 58 CGA2020    01/29/2021    16:31:27
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PUD
Table 4

Cawley, Gillespie & Associates, Inc.

LOGO

Table 5

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Undeveloped Reserves

BLACKBEARD OPERATING — WADDELL WN ETAL TR AB

SAND HILLS (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** -2.035
**** 12-2022 **** 1.275
**** 12-2023 **** 1.020
**** 12-2024 **** 0.837
**** 12-2025 **** 0.700
**** 12-2026 **** 0.593
**** 12-2027 **** 0.505
**** 12-2028 **** 0.427
**** 12-2029 **** 0.357
**** 12-2030 **** 0.295
**** 12-2031 **** 0.238
**** 12-2032 **** 0.186
**** 12-2033 **** 0.140
**** 12-2034 **** 0.099
**** 12-2035 **** 0.062
**** S Tot **** 4.699
**** After **** 0.030
**** Total **** 4.729
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 1.0 **** .0
**** 12-2027 **** 1.0 **** .0
**** 12-2028 **** 1.0 **** .0
**** 12-2029 **** 1.0 **** .0
**** 12-2030 **** 1.0 **** .0
**** 12-2031 **** 1.0 **** .0
**** 12-2032 **** 1.0 **** .0
**** 12-2033 **** 1.0 **** .0
**** 12-2034 **** 1.0 **** .0
**** 12-2035 **** 1.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 177.290
Oil Rate **** 890. **** 125. bbls/mo **** 21.7 % **** 0.00 **** 10.0 % **** 4,799. **** 4,799. **** /w/mo Expense 25.0000 **** 25.0000 **** 10.00 **** 125.422
Gas Rate **** 2,181. **** 263. Mcf/mo **** 22.4 % **** 0.00 **** 11.0 % Revenue **** 15.00 **** 88.446
GOR **** 2,440. **** 2,090. scf/bbl Oil 25.0000 **** 25.0000 **** 20.00 **** 61.166
Gas Shrinkage **** 0.0 **** 0.0 % Gas 25.0000 **** 25.0000 **** 25.00 **** 40.454
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 24.347
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API:    CODE:
PROPNUM: 7 Months in year ‘21
Start Date: 06/2021     16.000 Year Life (06/2037)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 60 CGA2020    01/29/2021    16:31:27
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PUD
Table 5

Cawley, Gillespie & Associates, Inc.

LOGO

Table 6

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Undeveloped Reserves

BLACKBEARD OPERATING — WADDELL WN ETAL TR H

SAND HILLS (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** -5.457
**** 12-2022 **** 2.768
**** 12-2023 **** 2.190
**** 12-2024 **** 1.784
**** 12-2025 **** 1.484
**** 12-2026 **** 1.251
**** 12-2027 **** 1.066
**** 12-2028 **** 0.905
**** 12-2029 **** 0.760
**** 12-2030 **** 0.629
**** 12-2031 **** 0.512
**** 12-2032 **** 0.406
**** 12-2033 **** 0.311
**** 12-2034 **** 0.225
**** 12-2035 **** 0.147
**** S Tot **** 8.980
**** After **** 0.094
**** Total **** 9.075
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 1.0 **** .0
**** 12-2027 **** 1.0 **** .0
**** 12-2028 **** 1.0 **** .0
**** 12-2029 **** 1.0 **** .0
**** 12-2030 **** 1.0 **** .0
**** 12-2031 **** 1.0 **** .0
**** 12-2032 **** 1.0 **** .0
**** 12-2033 **** 1.0 **** .0
**** 12-2034 **** 1.0 **** .0
**** 12-2035 **** 1.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 328.584
Oil Rate **** 890. **** 125. bbls/mo **** 21.7 % **** 0.00 **** 10.0 % **** 4,799. **** 4,799. **** /w/mo Expense 50.0000 **** 50.0000 **** 10.00 **** 223.419
Gas Rate **** 2,181. **** 263. Mcf/mo **** 22.4 % **** 0.00 **** 11.0 % Revenue **** 15.00 **** 149.900
GOR **** 2,440. **** 2,090. scf/bbl Oil 50.0000 **** 50.0000 **** 20.00 **** 96.774
Gas Shrinkage **** 0.0 **** 0.0 % **** 25.00 **** 57.318
Oil Severance **** 4.6 **** 4.6 % Gas 50.0000 **** 50.0000 **** 30.00 **** 27.341
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API:    CODE:
PROPNUM: 3 Months in year ‘21
Start Date: 10/2021     16.000 Year Life (09/2037)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 70 CGA2020    01/29/2021    16:31:27
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PUD
Table 6

Cawley, Gillespie & Associates, Inc.

LOGO

Table 7

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Undeveloped Reserves

BLACKBEARD OPERATING — WADDELL WN ETAL TR D

SAND HILLS (WOLFCAMP) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** -5.201
**** 12-2022 **** 2.711
**** 12-2023 **** 2.151
**** 12-2024 **** 1.755
**** 12-2025 **** 1.462
**** 12-2026 **** 1.234
**** 12-2027 **** 1.052
**** 12-2028 **** 0.892
**** 12-2029 **** 0.748
**** 12-2030 **** 0.619
**** 12-2031 **** 0.502
**** 12-2032 **** 0.397
**** 12-2033 **** 0.303
**** 12-2034 **** 0.217
**** 12-2035 **** 0.141
**** S Tot **** 8.982
**** After **** 0.084
**** Total **** 9.066
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 1.0 **** .0
**** 12-2022 **** 1.0 **** .0
**** 12-2023 **** 1.0 **** .0
**** 12-2024 **** 1.0 **** .0
**** 12-2025 **** 1.0 **** .0
**** 12-2026 **** 1.0 **** .0
**** 12-2027 **** 1.0 **** .0
**** 12-2028 **** 1.0 **** .0
**** 12-2029 **** 1.0 **** .0
**** 12-2030 **** 1.0 **** .0
**** 12-2031 **** 1.0 **** .0
**** 12-2032 **** 1.0 **** .0
**** 12-2033 **** 1.0 **** .0
**** 12-2034 **** 1.0 **** .0
**** 12-2035 **** 1.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 329.558
Oil Rate **** 890. **** 125. bbls/mo **** 21.7 % **** 0.00 **** 10.0 % **** 4,799. **** 4,799. **** /w/mo Expense 50.0000 **** 50.0000 **** 10.00 **** 224.954
Gas Rate **** 2,181. **** 260. Mcf/mo **** 22.5 % **** 0.00 **** 11.0 % Revenue **** 15.00 **** 151.481
GOR **** 2,440. **** 2,070. scf/bbl Oil 50.0000 **** 50.0000 **** 20.00 **** 98.126
Gas Shrinkage **** 0.0 **** 0.0 % Gas 50.0000 **** 50.0000 **** 25.00 **** 58.294
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 27.866
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API:    CODE: CGA173006
PROPNUM: L8BFQD1B00 4 Months in year ‘21
Start Date: 09/2021 16.000 Year Life (09/2037)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 18 CGA2020    01/29/2021    16:31:27
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PUD
Table 7

Cawley, Gillespie & Associates, Inc.

LOGO

Table 8

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Undeveloped Reserves

BLACKBEARD OPERATING — WADDELL WN TR 1

WADDELL (GRAYBURG SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** -3.127
**** 12-2022 **** 3.780
**** 12-2023 **** 3.470
**** 12-2024 **** 3.181
**** 12-2025 **** 2.913
**** 12-2026 **** 2.664
**** 12-2027 **** 2.432
**** 12-2028 **** 2.215
**** 12-2029 **** 2.015
**** 12-2030 **** 1.828
**** 12-2031 **** 1.655
**** 12-2032 **** 1.493
**** 12-2033 **** 1.343
**** 12-2034 **** 1.203
**** 12-2035 **** 1.074
**** S Tot **** 28.139
**** After **** 5.528
**** Total **** 33.667
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 2.0 **** .0
**** 12-2022 **** 2.0 **** .0
**** 12-2023 **** 2.0 **** .0
**** 12-2024 **** 2.0 **** .0
**** 12-2025 **** 2.0 **** .0
**** 12-2026 **** 2.0 **** .0
**** 12-2027 **** 2.0 **** .0
**** 12-2028 **** 2.0 **** .0
**** 12-2029 **** 2.0 **** .0
**** 12-2030 **** 2.0 **** .0
**** 12-2031 **** 2.0 **** .0
**** 12-2032 **** 2.0 **** .0
**** 12-2033 **** 2.0 **** .0
**** 12-2034 **** 2.0 **** .0
**** 12-2035 **** 2.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 1,091.757
Oil Rate **** 1,495. **** 200. bbls/mo **** 7.0 % **** 0.00 **** 7.0 % **** 3,561. **** 3,561. **** /w/mo Expense 37.5000 **** 37.5000 **** 10.00 **** 769.883
Gas Rate **** 1,495. **** 200. Mcf/mo **** 7.0 % **** 0.00 **** 7.0 % Revenue **** 15.00 **** 567.813
GOR **** 1,000. **** 1,000. scf/bbl Oil 37.5000 **** 37.5000 **** 20.00 **** 431.397
Gas Shrinkage **** 0.0 **** 0.0 % Gas 37.5000 **** 37.5000 **** 25.00 **** 333.994
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 261.353
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API: MIN    CODE:
PROPNUM: L8BFQHPC00 10 Months in year ‘21
Start Date: 03/2021 27.750 Year Life (12/2048)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 147 CGA2020    01/29/2021    16:31:27
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PUD
Table 8

Cawley, Gillespie & Associates, Inc.

LOGO

Table 9

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Waddell Ranch Properties

Proved Undeveloped Reserves

BLACKBEARD OPERATING — WADDELL WN EAST RANCH

WADDELL (GRAYBURG SAN ANDRES) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** -3.127
**** 12-2022 **** 3.780
**** 12-2023 **** 3.470
**** 12-2024 **** 3.181
**** 12-2025 **** 2.913
**** 12-2026 **** 2.664
**** 12-2027 **** 2.432
**** 12-2028 **** 2.215
**** 12-2029 **** 2.015
**** 12-2030 **** 1.828
**** 12-2031 **** 1.655
**** 12-2032 **** 1.493
**** 12-2033 **** 1.343
**** 12-2034 **** 1.203
**** 12-2035 **** 1.074
**** S Tot **** 28.139
**** After **** 5.528
**** Total **** 33.667
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** 2.0 **** .0
**** 12-2022 **** 2.0 **** .0
**** 12-2023 **** 2.0 **** .0
**** 12-2024 **** 2.0 **** .0
**** 12-2025 **** 2.0 **** .0
**** 12-2026 **** 2.0 **** .0
**** 12-2027 **** 2.0 **** .0
**** 12-2028 **** 2.0 **** .0
**** 12-2029 **** 2.0 **** .0
**** 12-2030 **** 2.0 **** .0
**** 12-2031 **** 2.0 **** .0
**** 12-2032 **** 2.0 **** .0
**** 12-2033 **** 2.0 **** .0
**** 12-2034 **** 2.0 **** .0
**** 12-2035 **** 2.0 **** .0
**** S Tot
**** After
**** Total

All values are in US Dollars.

Evaluation Parameters (Gross) Expenses (Gross) Percent Cum. Disc.
Initial Final Units Dei n Def Initial Final Units Final 5.00 1,091.757
Oil Rate **** 1,495. **** 200. bbls/mo **** 7.0 % **** 0.00 **** 7.0 % **** 3,561. **** 3,561. **** /w/mo Expense 37.5000 **** 37.5000 **** 10.00 **** 769.883
Gas Rate **** 1,495. **** 200. Mcf/mo **** 7.0 % **** 0.00 **** 7.0 % Revenue **** 15.00 **** 567.813
GOR **** 1,000. **** 1,000. scf/bbl Oil 37.5000 **** 37.5000 **** 20.00 **** 431.397
Gas Shrinkage **** 0.0 **** 0.0 % Gas 37.5000 **** 37.5000 **** 25.00 **** 333.994
Oil Severance **** 4.6 **** 4.6 % **** 30.00 **** 261.353
Gas Severance **** 5.3 **** 5.3 %
Ad Valorem **** 3.4 %

All values are in US Dollars.

API: MIN    CODE: 100,103,1
PROPNUM: L8BFQFVC00 10 Months in year ‘21
Start Date: 03/2021 27.750 Year Life (12/2048)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 83 CGA2020    01/29/2021    16:31:27
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PUD
Table 9

Cawley, Gillespie & Associates, Inc.

PERMIAN BASIN ROYALTY TRUST

WADDELL RANCH PROPERTIES

CRANE COUNTY, TEXAS

AND

TEXAS ROYALTYPROPERTIES

VARIOUS TEXAS COUNTIES

PERMIAN BASIN ROYALTY TRUST INTERESTS

PROVED RESERVES AND ECONOMIC FORECASTS

AS OF DECEMBER 31, 2020

PREPARED WITH SEC PRICE AND COST CRITERIA

VOLUME II OF II

LOGO

Texas Registered Engineering Firm F-693

PERMIAN BASIN ROYALTY TRUST

WADDELL RANCH PROPERTIES

CRANE COUNTY, TEXAS

AND

TEXAS ROYALTYPROPERTIES

VARIOUS TEXAS COUNTIES

PERMIAN BASIN ROYALTY TRUST INTERESTS

PROVED RESERVES AND ECONOMIC FORECASTS

AS OF DECEMBER 31, 2020

PREPARED WITH SEC PRICE AND COST CRITERIA

VOLUME II OF II

CAWLEY, GILLESPIE & ASSOCIATES, INC.
Petroleum Consultants
Texas Registered Engineering Firm F-693
KENNETH MUELLER, P.E. 86132
VICE PRESIDENT

WADDELL RANCH PROPERTIES AND TEXAS ROYALTY PROPERTIES

Permian Basin Royalty Trust Interests

As of December 31, 2020

Table of Contents

Volume I

Letter of Transmittal

Table of Contents

WADDELL RANCH PROPERTIES
Total Proved Reserves Table I – Total Proved
Summary Plot – Total Proved
One-Line Lease Reserves Summary Table II – Total Proved (8 pages)
Proved Developed Producing Reserves Table I – PDP
Summary Plot – Proved Developed Producing
One-Line Lease Reserves Summary Table II – PDP (7 pages)
Individual Lease Forecasts Graphs and Tables Tables 1 – 110
Proved Developed Non-ProducingReserves Table I – PDNP
Summary Plot – Proved Developed<br>Non-Producing
One-Line Lease Reserves Summary Table II – PDNP (1 page)
Individual Lease Forecasts Tables Tables 1 – 4
Proved Undeveloped Reserves Table I – PUD
Summary Plot – Proved Undeveloped
One-Line Lease Reserves Summary Table II – PUD (1 page)
Individual Lease Forecasts Tables Tables 1 – 9

Volume II

TEXAS ROYALTY PROPERTIES
Proved Reserves Table I - Proved
Summary Plot – Proved
One-Line Lease Reserves Summary Table II – Proved (10 pages)
Individual Lease Forecasts Graphs and Tables Tables 1 – 127
Appendix I
Waddell Ranch Properties Interest Computation Page 1
Texas Royalty Properties Interest Computation Page 2
Appendix II
--- ---
Explanatory Comments Page 1
Methods Employed in the Estimation of Reserves Page 2
Reserve Definitions and Classifications Pages 3-4

Table I - Proved

Composite of Reserve Estimates and Economic Forecasts

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

Various Counties, Texas

As of December 31, 2020

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 199.059
**** 12-2022 **** 184.637
**** 12-2023 **** 171.576
**** 12-2024 **** 159.787
**** 12-2025 **** 149.078
**** 12-2026 **** 139.266
**** 12-2027 **** 130.224
**** 12-2028 **** 121.915
**** 12-2029 **** 114.230
**** 12-2030 **** 107.127
**** 12-2031 **** 100.557
**** 12-2032 **** 94.464
**** 12-2033 **** 88.719
**** 12-2034 **** 83.371
**** 12-2035 **** 78.360
**** S Tot **** 1,922.371
**** After **** 1,057.711
**** Total **** 2,980.082
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

SEC 12-31-2020 Benchmark Prices Percent Cum. Disc.
Year WTI SpotOil /STB Henry HubGas /MMBTU 5.00 64,702.2
10.00 46,238.9 ****
2021 **** 15.00 **** 36,321.4
Thereafter **** 20.00 **** 30,148.4
Cap **** 25.00 **** 25,933.2
**** 30.00 **** 22,868.4

All values are in US Dollars.

12 Months in first year
50.000 Year Life (01/2071)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. 01/29/2021    15:43:26
--- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
Summary

Cawley, Gillespie & Associates, Inc.

LOGO

Table II - Proved

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

Various Counties, Texas

As of December 31, 2020

LEASE NAME Start CurrentInterest Life UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL/MMCF M / M M / M M / M M M
DEEP ROCK & SHAFTER LAKE (VARIOUS) — ANDREWS COUNTY, TEXAS
DEEP ROCK A & SHAFTER LAKE SA 100.0000 NI **** 73.8 **** 29.3 **** 25.8
1 PDP Oil 28 0.0000 WI **** 50.0 **** 4.4 **** 1.3 **** 1.1
DEEP ROCK & WALLEN (VARIOUS) — ANDREWS COUNTY, TEXAS
MILES B, MILES HAYDEN, SOUTHL 100.0000 NI **** 88.1 **** 7.1 **** 6.3
2 PDP Oil 1 0.0000 WI **** 47.0 **** 74.6 **** 0.2 **** 0.2
DOLLARHIDE (VARIOUS) — ANDREWS COUNTY, TEXAS
DOLLARHIDE & N. DOLLARHIDE UN 100.0000 NI **** 314.6 **** 77.6 **** 68.4
3 PDP Oil 36 0.0000 WI **** 44.4 **** 110.6 **** 17.9 **** 15.8
DOLLARHIDE (CLEAR FORK) — ANDREWS COUNTY, TEXAS
FAST DOLLAR 1H 100.0000 NI **** 0.9 **** 0.4 **** 0.3
4 PDP Oil 1H 141 0.0000 WI **** 5.7 **** 0.2 **** 0.1 **** 0.1
QUICK DOLLAR 1H 100.0000 NI **** 1.2 **** 0.5 **** 0.4
5 PDP Oil 1H 142 0.0000 WI **** 5.9 **** 0.2 **** 0.1 **** 0.1
FULLERTON (CLEARFORK) — ANDREWS COUNTY, TEXAS
FULLERTON CLEARFORK UNIT 100.0000 NI **** 99.1 **** 25.2 **** 22.2
6 PDP Oil 57 0.0000 WI **** 29.1 **** 84.9 **** 36.6 **** 32.2
FULLERTON (WOLFCAMP) — ANDREWS COUNTY, TEXAS
MOBIL FEE #18-3 TRUST PRIMAL 0.0000 NI **** 2.4 **** 0.0 **** 0.0
7 PDP Oil 82 0.0000 WI **** 0.0 **** 4.6 **** 0.0 **** 0.0
FULLERTON (VARIOUS) — ANDREWS COUNTY, TEXAS
RALPH 3, 4, 6 100.0000 NI **** 31.2 **** 0.6 **** 0.6
8 PDP Oil 20 0.0000 WI **** 21.9 **** 24.8 **** 1.1 **** 0.9
FULLERTON (DEVONIAN & ELLENBURG) — ANDREWS COUNTY, TEXAS
WILSON H M ‘A‘ & ‘B‘ 100.0000 NI **** 101.5 **** 3.3 **** 2.9
9 PDP Oil 35 0.0000 WI **** 50.0 **** 63.2 **** 6.4 **** 5.7
MEANS (STRAWN, QUEEN, WOLFC) — ANDREWS COUNTY, TEXAS
MEANS R M 0.0000 NI **** 181.5 **** 0.0 **** 0.0
10 PDP Oil 24 0.0000 WI **** 0.0 **** 16.5 **** 0.0 **** 0.0
MEANS (SAN ANDRES) — ANDREWS COUNTY, TEXAS
MEANS SAN ANDRES UNIT 100.0000 NI **** 199.0 **** 63.4 **** 55.9
11 PDP Oil 44 0.0000 WI **** 45.0 **** 2.4 **** 0.0 **** 0.0
REINECKE (VARIOUS) — BORDEN COUNTY, TEXAS
REINECKE UNIT & HOLBEIN I 100.0000 NI **** 51.5 **** 0.6 **** 0.5
12 PDP Oil 75 0.0000 WI **** 19.4 **** 62.4 **** 2.9 **** 2.5
HASTINGS EAST — BRAZORIA COUNTY, TEXAS
SNEED H G & GILBERT 100.0000 NI **** 75.8 **** 0.2 **** 0.2
13 PDP Oil 97 0.0000 WI **** 10.6 **** 0.0 **** 0.0 **** 0.0
HASTINGS WEST & EAST — BRAZORIA COUNTY, TEXAS
WEST HASTINGS UNIT & SNEED 100.0000 NI **** 182.8 **** 69.6 **** 61.3
14 PDP Oil 52 0.0000 WI **** 42.7 **** 45.5 **** 0.0 **** 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: YE2020 1/29/2021 : 4:04:05 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.
Cawley, Gillespie & Associates, Inc.
Page 1

Table II - Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

Various Counties, Texas

As of December 31, 2020

LEASE NAME Start CurrentInterest Life UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL/MMCF M / M M / M M / M M M
SHERIFF (VARIOUS) — CALHOUN COUNTY, TEXAS
MAXWELL MAUDE, FRANK BOYD, OT 0.0000 NI **** 26.3 **** 0.0 **** 0.0
15 PDP Oil 86 0.0000 WI **** 0.0 **** 37.6 **** 0.0 **** 0.0
SHERIFF (GRETA 5700) — CALHOUN COUNTY, TEXAS
TPIC 0.0000 NI **** 0.2 **** 0.0 **** 0.0
16 PDP Oil 132 0.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
PANHANDLE (WOLFCAMP GRANITEWASH) — CARSON COUNTY, TEXAS
COCKRELL RANCH 2, 3, 4 0.0000 NI **** 0.1 **** 0.0 **** 0.0
17 PDP Oil 140 0.0000 WI **** 0.0 **** 0.2 **** 0.0 **** 0.0
ARMER & CRAWAR (VARIOUS) — CRANE COUNTY, TEXAS
VARIOUS EDWARDS CRANE COUNTY 100.0000 NI **** 115.2 **** 1.1 **** 1.0
18 PDP Oil 21 0.0000 WI **** 34.7 **** 623.2 **** 2.3 **** 2.0
MCELROY (BEND 8960) — CRANE COUNTY, TEXAS
MCCLINTIC H L ETAL 100.0000 NI **** 50.0 **** 11.8 **** 10.4
19 PDP Oil 18 0.0000 WI **** 25.7 **** 25.5 **** 6.1 **** 5.4
SAND HILLS (JUDKINS) — CRANE COUNTY, TEXAS
JUDKINS GAS UNIT 2 100.0000 NI **** 21.9 **** 0.0 **** 0.0
20 PDP Gas 11 0.0000 WI **** 50.0 **** 1,525.3 **** 77.5 **** 68.2
SAND HILLS (MCKNIGHT) — CRANE COUNTY, TEXAS
MCKNIGHT MB & MB A 100.0000 NI **** 475.1 **** 91.5 **** 80.7
21 PDP Oil 2 0.0000 WI **** 20.5 **** 1,418.3 **** 43.5 **** 38.2
MCKNIGHT MB B&C 0.0000 NI **** 7.7 **** 0.0 **** 0.0
22 PDP Oil 100 0.0000 WI **** 0.0 **** 46.4 **** 0.0 **** 0.0
SAND HILLS (VARIOUS) — CRANE COUNTY, TEXAS
TUBB JB VARIOUS AND OTHER TUB 100.0000 NI **** 268.9 **** 23.8 **** 21.0
23 PDP Gas 101 0.0000 WI **** 21.6 **** 5,184.9 **** 172.6 **** 151.9
SAND HILLS (JUDKINS & TUBB) — CRANE COUNTY, TEXAS
TUBB JBA A & B 100.0000 NI **** 1.2 **** 0.1 **** 0.1
24 PDP Gas 22 0.0000 WI **** 43.4 **** 40.9 **** 5.8 **** 5.1
SAND HILLS (VARIOUS) — CRANE COUNTY, TEXAS
WADDELL W N (TRUST) 0.0000 NI **** 5.0 **** 0.0 **** 0.0
25 PDP Gas 102 0.0000 WI **** 0.0 **** 19.3 **** 0.0 **** 0.0
TODD, TODD DEEP, DOUBLE R (CRINOIDAL, ELLENBRGR) — CROCKETT COUNTY, TEXAS
VARIOUS TODD PROPERTIES 100.0000 NI **** 526.1 **** 20.8 **** 18.3
26 PDP Oil 23 0.0000 WI **** 19.2 **** 266.5 **** 3.8 **** 3.3
COWDEN NORTH (DEEP) — ECTOR COUNTY, TEXAS
BLAKENEY BH A,B,C, SUN & SMIT 100.0000 NI **** 74.5 **** 1.8 **** 1.6
27 PDP Oil 34 0.0000 WI **** 35.7 **** 43.8 **** 0.1 **** 0.1
COWDEN JM R/A A B & C 100.0000 NI **** 444.2 **** 74.0 **** 65.2
28 PDP Oil 32 0.0000 WI **** 26.6 **** 622.9 **** 162.7 **** 143.2

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: YE2020 1/29/2021 : 4:04:05 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.
Cawley, Gillespie & Associates, Inc.
Page 2

Table II - Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

Various Counties, Texas

As of December 31, 2020

LEASE NAME Start CurrentInterest Life UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL/MMCF M / M M / M M / M M M
COWDEN NORTH (VARIOUS) — ECTOR COUNTY, TEXAS
NORTH COWDEN UNIT 100.0000 NI **** 206.8 **** 24.5 **** 21.6
29 PDP Oil 33 0.0000 WI **** 37.3 **** 40.5 **** 3.2 **** 2.9
FOSTER (GRAYBURG) — ECTOR COUNTY, TEXAS
FOSTER C & D 100.0000 NI **** 172.3 **** 4.8 **** 4.3
30 PDP Oil 29 0.0000 WI **** 22.1 **** 35.9 **** 0.5 **** 0.4
GOLDSMITH (SAN ANDRES) — ECTOR COUNTY, TEXAS
GOLDSMITH SAN ANDRES UNIT 100.0000 NI **** 791.5 **** 20.1 **** 17.7
31 PDP Oil 30 0.0000 WI **** 22.9 **** 2,079.8 **** 23.1 **** 20.3
JORDAN (VARIOUS) — ECTOR COUNTY, TEXAS
WEST JORDAN UNIT 100.0000 NI **** 24.8 **** 1.2 **** 1.1
32 PDP Oil 27 0.0000 WI **** 13.6 **** 9.7 **** 0.3 **** 0.3
JORDAN, PENWELL (VARIOUS) — ECTOR COUNTY, TEXAS
CONNELL W E VARIOUS 100.0000 NI **** 83.5 **** 0.1 **** 0.1
33 PDP Oil 103 0.0000 WI **** 8.0 **** 25.9 **** 0.0 **** 0.0
PENWELL (CLEARFORK) — ECTOR COUNTY, TEXAS
PENWELL UNIT 100.0000 NI **** 33.7 **** 4.5 **** 4.0
34 PDP Oil 26 0.0000 WI **** 33.5 **** 9.4 **** 0.6 **** 0.5
CEDAR LAKE (SILURIAN) — GAINES COUNTY, TEXAS
CEDAR LAKE UNIT & BREMONT 100.0000 NI **** 319.2 **** 45.7 **** 40.3
35 PDP Oil 42 0.0000 WI **** 40.7 **** 6.1 **** 0.0 **** 0.0
JENKINS, BAKER, NOLLEY (SAN ANDRES & WLFCMP) — GAINES COUNTY, TEXAS
JENKINS UNIT, PROCTOR, NOLLEY 100.0000 NI **** 276.8 **** 47.1 **** 41.5
36 PDP Oil 41 0.0000 WI **** 50.0 **** 602.7 **** 7.1 **** 6.3
SEMINOLE (SAN ANGELO) — GAINES COUNTY, TEXAS
AVERITT & RILEY TS 100.0000 NI **** 49.2 **** 5.3 **** 4.7
37 PDP Oil 39 0.0000 WI **** 48.9 **** 7.8 **** 0.0 **** 0.0
SEMINOLE (SAN ANDRES & DEEP) — GAINES COUNTY, TEXAS
SEMINOLE SAN ANDRES & DEEP UN 100.0000 NI **** 673.4 **** 138.1 **** 121.7
38 PDP Oil 38 0.0000 WI **** 50.0 **** 47.7 **** 0.0 **** 0.0
SEMINOLE (SADR, WFCMP, DEVON) — GAINES COUNTY, TEXAS
VARIOUS SEMINOLE PROPERTIES 0.0000 NI **** 16.1 **** 0.0 **** 0.0
39 PDP Oil 40 0.0000 WI **** 0.0 **** 0.0 **** 0.0 **** 0.0
SEMINOLE WEST (VARIOUS) — GAINES COUNTY, TEXAS
W SEMINOLE SA UNIT & VARIOUS 100.0000 NI **** 161.7 **** 86.7 **** 76.4
40 PDP Oil 37 0.0000 WI **** 36.2 **** 182.0 **** 0.0 **** 0.0
WASSON 72 (VARIOUS) — GAINES COUNTY, TEXAS
GAINES WASSON CLEARFORK UNIT 100.0000 NI **** 234.7 **** 28.6 **** 25.2
41 PDP Oil 45 0.0000 WI **** 27.2 **** 94.2 **** 0.6 **** 0.6

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: YE2020 1/29/2021 : 4:04:05 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.
Cawley, Gillespie & Associates, Inc.
Page 3

Table II - Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

Various Counties, Texas

As of December 31, 2020

LEASE NAME Start CurrentInterest Life UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL/MMCF M / M M / M M / M M M
WASSON 72 (VARIOUS) — GAINES COUNTY, TEXAS
WASSON SOUTH CLEARFORK UNIT 100.0000 NI **** 170.8 **** 14.4 **** 12.7
42 PDP Oil 43 0.0000 WI **** 26.8 **** 15.7 **** 0.2 **** 0.2
WASSON SOUTH (WICHITA ALBANY) — GAINES COUNTY, TEXAS
WASSON 48 (TRUST) 100.0000 NI **** 568.6 **** 1.4 **** 1.2
43 PDP Oil 104 0.0000 WI **** 33.7 **** 188.0 **** 0.0 **** 0.0
PANHANDLE GRAY COUNTY — GRAY COUNTY, TEXAS
COMBS, COMBS & WORLEY, OTHER 100.0000 NI **** 65.1 **** 13.3 **** 11.7
44 PDP Oil 105 0.0000 WI **** 34.8 **** 164.6 **** 28.3 **** 24.9
PANHANDLE GRAY COUNTY (VARIOUS) — GRAY COUNTY, TEXAS
PANHANDLE GRAY COUNTY VARIOUS 100.0000 NI **** 85.2 **** 0.2 **** 0.2
45 PDP Oil 46 0.0000 WI **** 8.7 **** 247.2 **** 0.9 **** 0.8
BIG MINERAL CREEK (VARIOUS) — GRAYSON COUNTY, TEXAS
BIG MINERAL CREEK UNITS 100.0000 NI **** 90.0 **** 4.9 **** 4.3
46 PDP Oil 53 0.0000 WI **** 38.2 **** 36.8 **** 3.5 **** 3.1
BIG MINERAL CREEK (WOODFORD) — GRAYSON COUNTY, TEXAS
SOUTHLAND UNIT 1H 100.0000 NI **** 0.3 **** 0.0 **** 0.0
47 PDP Oil 139 0.0000 WI **** 2.1 **** 2.0 **** 0.3 **** 0.2
SHERMAN EAST (PENN 7100) — GRAYSON COUNTY, TEXAS
BROWN BETH-KIMBELL-BELL UNITS 100.0000 NI **** 77.4 **** 11.8 **** 10.4
48 PDP Oil 54 0.0000 WI **** 50.0 **** 79.6 **** 24.5 **** 21.5
AIRSTRIP (BONE SPRINGS) — GREGG COUNTY, TEXAS
FOSTER HL & WE JONES 100.0000 NI **** 46.6 **** 2.4 **** 2.1
49 PDP Oil 48 0.0000 WI **** 41.8 **** 14.1 **** 0.0 **** 0.0
EAST TEXAS — GREGG COUNTY, TEXAS
LAWRENCE HM 100.0000 NI **** 118.4 **** 5.2 **** 4.6
50 PDP Oil 51 0.0000 WI **** 39.2 **** 55.1 **** 3.3 **** 2.9
MOORE BOSTON 100.0000 NI **** 202.6 **** 0.4 **** 0.3
51 PDP Oil 50 0.0000 WI **** 14.4 **** 27.7 **** 0.1 **** 0.1
EAST TEXAS & OTHERS (VARIOUS) — GREGG COUNTY, TEXAS
VARIOUS EAST TEXAS PROPERTIES 100.0000 NI **** 728.3 **** 3.6 **** 3.2
52 PDP Oil 47 0.0000 WI **** 20.8 **** 367.3 **** 7.9 **** 6.9
WILLOW SPRINGS (VARIOUS) — GREGG COUNTY, TEXAS
DAVIS JD E GAS UNIT 100.0000 NI **** 0.6 **** 0.0 **** 0.0
53 PDP Gas 106 0.0000 WI **** 16.2 **** 126.5 **** 3.5 **** 3.1
ANTON-IRISH (CLEARFORK) — HALE COUNTY, TEXAS
ANTON-IRISH CLEARFORK UNIT 100.0000 NI **** 238.3 **** 19.1 **** 16.8
54 PDP Oil 55 0.0000 WI **** 31.6 **** 27.4 **** 0.0 **** 0.0
SLAUGHTER (VARIOUS) — HOCKLEY COUNTY, TEXAS
SUNDOWN UNIT 100.0000 NI **** 72.6 **** 9.9 **** 8.7
55 PDP Oil 56 0.0000 WI **** 43.8 **** 11.3 **** 0.0 **** 0.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: YE2020 1/29/2021 : 4:04:05 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.
Cawley, Gillespie & Associates, Inc.
Page 4

Table II - Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

Various Counties, Texas

As of December 31, 2020

LEASE NAME Start CurrentInterest Life UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL/MMCF M / M M / M M / M M M
COAHOMA N, IATAN, SNYDER (VARIOUS) — HOWARD COUNTY, TEXAS
VARIOUS TL&M A & HELEN 0.0000 NI **** 84.0 **** 0.0 **** 0.0
56 PDP Oil 65 0.0000 WI **** 0.0 **** 21.0 **** 0.0 **** 0.0
HOWARD GLASSCOCK (VARIOUS) — HOWARD COUNTY, TEXAS
CHALK DUNCAN, DORIS, OTIS, OT 100.0000 NI **** 203.3 **** 10.7 **** 9.4
57 PDP Oil 59 0.0000 WI **** 14.2 **** 34.6 **** 1.0 **** 0.9
HOWARD GLASSCOCK (GLORIETA) — HOWARD COUNTY, TEXAS
CHALK H-G GLORIETA, OTHER CHA 100.0000 NI **** 208.9 **** 22.0 **** 19.4
58 PDP Oil 62 0.0000 WI **** 20.7 **** 11.8 **** 2.2 **** 1.9
HOWARD GLASSCOCK (VARIOUS) — HOWARD COUNTY, TEXAS
HYMAN-CHALK, CHALK, BOWEN 100.0000 NI **** 187.7 **** 10.8 **** 9.5
59 PDP Oil 61 0.0000 WI **** 16.1 **** 84.4 **** 3.3 **** 2.9
OVERTON B & OVERTON B ‘A‘ 100.0000 NI **** 296.8 **** 13.0 **** 11.5
60 PDP Oil 63 0.0000 WI **** 15.4 **** 6.0 **** 0.2 **** 0.2
REED VARIOUS 100.0000 NI 183.3 23.6 20.8
61 PDP Oil 60 0.0000 WI 28.9 21.6 1.7 1.5
HOWARD GLASSCOCK (YATES, OTHERS) — HOWARD COUNTY, TEXAS
SETTLES W R B & SETTLES YATES 100.0000 NI **** 147.3 **** 34.6 **** 30.5
62 PDP Oil 107 0.0000 WI **** 27.2 **** 2.7 **** 1.0 **** 0.9
HOWARD GLASSCOCK (VARIOUS) — HOWARD COUNTY, TEXAS
SETTLES YATES UNIT & OTHER SE 0.0000 NI **** 209.2 **** 0.0 **** 0.0
63 PDP Oil 58 0.0000 WI **** 0.0 **** 1.6 **** 0.0 **** 0.0
IATAN EAST HOWARD (VARIOUS) — HOWARD COUNTY, TEXAS
TL&M A-R/A-A 100.0000 NI **** 18.7 **** 1.4 **** 1.2
64 PDP Oil 66 0.0000 WI **** 26.4 **** 10.9 **** 3.7 **** 3.2
SNYDER (VARIOUS) — HOWARD COUNTY, TEXAS
O‘DANIEL A E, O‘DANIEL B & O‘ 100.0000 NI **** 39.0 **** 3.3 **** 2.9
65 PDP Oil 108 0.0000 WI **** 23.2 **** 0.0 **** 0.0 **** 0.0
VEALMOOR EAST (CANYON REEF) — HOWARD COUNTY, TEXAS
EAST VEALMOOR UNIT 100.0000 NI **** 20.2 **** 0.7 **** 0.6
66 PDP Oil 64 0.0000 WI **** 23.2 **** 74.1 **** 1.1 **** 1.0
PANHANDLE — HUTCHINSON COUNTY, TEXAS
JOHNSON G (TRUST) SA OIL 0.0000 NI **** 2.2 **** 0.0 **** 0.0
67 PDP Gas 109 0.0000 WI **** 0.0 **** 38.9 **** 0.0 **** 0.0
PANHANDLE & ADOBE WALL — HUTCHINSON COUNTY, TEXAS
TURNER-KENT B & VARIOUS COCKR 100.0000 NI **** 271.7 **** 0.5 **** 0.4
68 PDP Oil 70 0.0000 WI **** 8.8 **** 1,031.5 **** 0.0 **** 0.0
PANHANDLE HUTCHINSON COUNTY — HUTCHINSON COUNTY, TEXAS
ANTELOPE CREEK, JOHNSON EB A& 100.0000 NI **** 0.3 **** 0.0 **** 0.0
69 PDP Gas 67 0.0000 WI **** 19.5 **** 63.5 **** 5.3 **** 4.7

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: YE2020 1/29/2021 : 4:04:05 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.
Cawley, Gillespie & Associates, Inc.
Page 5

Table II - Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

Various Counties, Texas

As of December 31, 2020

LEASE NAME Start CurrentInterest Life UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL/MMCF M / M M / M M / M M M
PANHANDLE HUTCHINSON COUNTY — HUTCHINSON COUNTY, TEXAS
HUTCHINSON COUNTY PROPERTIES 100.0000 NI **** 0.5 **** 0.1 **** 0.1
70 PDP Oil 136 0.0000 WI **** 6.5 **** 29.3 **** 0.0 **** 0.0
PANHANDLE HUTCHINSON COUNTY (VARIOUS) — HUTCHINSON COUNTY, TEXAS
JOHNSON, JOHNSON RANCH & OTHE 100.0000 NI **** 36.1 **** 5.5 **** 4.9
71 PDP Gas 68 0.0000 WI **** 19.4 **** 743.5 **** 62.1 **** 54.6
JON & JON A1, B1 & C 0.0000 NI **** 0.0 **** 0.0 **** 0.0
72 PDP Gas 19 0.0000 WI **** 0.0 **** 60.6 **** 0.0 **** 0.0
PANHANDLE HUTCHINSON COUNTY V 100.0000 NI **** 111.5 **** 3.1 **** 2.7
73 PDP Gas 69 0.0000 WI **** 27.2 **** 6,301.0 **** 135.2 **** 119.0
VARIOUS COCKRELL PROPERTIES 100.0000 NI **** 39.5 **** 3.6 **** 3.2
74 PDP Oil 71 0.0000 WI **** 21.6 **** 112.7 **** 3.9 **** 3.4
PANHANDLE WEST (BROWN DOLOMITE) — HUTCHINSON COUNTY, TEXAS
MAYER 1R & GERRY 1—SUMMARY 100.0000 NI **** 0.0 **** 0.0 **** 0.0
75 PDP Gas 135 0.0000 WI **** 16.6 **** 9.8 **** 0.9 **** 0.8
COLEMAN RANCH (VARIOUS) — MITCHELL COUNTY, TEXAS
COLEMAN RANCH UNIT 100.0000 NI **** 92.2 **** 8.9 **** 7.9
76 PDP Oil 74 0.0000 WI **** 24.2 **** 0.0 **** 0.0 **** 0.0
COLEMAN RANCH, WESTBROOK (VARIOUS) — MITCHELL COUNTY, TEXAS
BURCHARD, COLEMAN VARIOUS, CO 100.0000 NI **** 142.4 **** 3.9 **** 3.5
77 PDP Oil 110 0.0000 WI **** 23.0 **** 0.0 **** 0.0 **** 0.0
IATAN & IATAN EAST HOWARD (SADR & CLEARFORK) — MITCHELL COUNTY, TEXAS
FOSTER MARY 100.0000 NI **** 121.7 **** 9.5 **** 8.4
78 PDP Oil 77 0.0000 WI **** 30.6 **** 8.7 **** 0.0 **** 0.0
IATAN EAST HOWARD (CLEARFORK) — MITCHELL COUNTY, TEXAS
WATSON WWD & WW 100.0000 NI **** 48.5 **** 3.1 **** 2.8
79 PDP Oil 76 0.0000 WI **** 34.0 **** 0.9 **** 0.0 **** 0.0
JAMESON NORTH (STRAWN & OTHERS) — MITCHELL COUNTY, TEXAS
MCCABE VT VARIOUS, STUBBLEFIE 100.0000 NI **** 22.6 **** 0.0 **** 0.0
80 PDP Oil 73 0.0000 WI **** 2.5 **** 38.7 **** 0.0 **** 0.0
WESTBROOK (CLEARFORK) — MITCHELL COUNTY, TEXAS
NORTH WESTBROOK UNIT 100.0000 NI **** 91.6 **** 7.7 **** 6.8
81 PDP Oil 72 0.0000 WI **** 19.2 **** 3.4 **** 0.0 **** 0.0
CONROE — MONTGOMERY COUNTY, TEXAS
CONROE FIELD UNIT 100.0000 NI **** 74.3 **** 10.5 **** 9.2
82 PDP Oil 78 0.0000 WI **** 47.8 **** 179.3 **** 9.2 **** 8.1
ARNOLD-DAVIS & LUBY (VARIOUS) — NUECES COUNTY, TEXAS
VARIOUS MCCANN PROPERTIES 0.0000 NI **** 20.2 **** 0.0 **** 0.0
83 PDP Gas 79 0.0000 WI **** 0.0 **** 620.1 **** 0.0 **** 0.0
CHENOT (WOLFCAMP) — PECOS COUNTY, TEXAS
WOODWARD 64 & SOUTHLAND ROYAL 100.0000 NI **** 4.7 **** 0.4 **** 0.3
84 PDP Gas 81 0.0000 WI **** 14.8 **** 600.3 **** 9.3 **** 8.1

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: YE2020 1/29/2021 : 4:04:05 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.
Cawley, Gillespie & Associates, Inc.
Page 6

Table II - Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

Various Counties, Texas

As of December 31, 2020

LEASE NAME Start CurrentInterest Life UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL/MMCF M / M M / M M / M M M
YATES (VARIOUS) — PECOS COUNTY, TEXAS
YATES FIELD UNIT & SMITH MYRO 100.0000 NI **** 1,656.6 **** 493.3 **** 434.8
85 PDP Oil 80 0.0000 WI **** 50.0 **** 145.2 **** 0.0 **** 0.0
YATES , TOBORG (WOLFCAMP, OTHERS) — PECOS COUNTY, TEXAS
CONOCO YATES, YATES IG, OTHER 100.0000 NI **** 309.8 **** 2.0 **** 1.7
86 PDP Oil 111 0.0000 WI **** 39.0 **** 2.1 **** 0.0 **** 0.0
SPRABERRY (TREND AREA) — REAGAN COUNTY, TEXAS
LOFTIN & GOULD A 100.0000 NI **** 123.1 **** 14.1 **** 12.5
87 PDP Oil 84 0.0000 WI **** 34.7 **** 458.7 **** 99.0 **** 87.1
DIAMOND -M- (CLEARFORK) — SCURRY COUNTY, TEXAS
PP BOYLES 100.0000 NI **** 9.9 **** 0.7 **** 0.6
88 PDP Oil 112 0.0000 WI **** 21.3 **** 1.6 **** 0.2 **** 0.1
KELLY-SNYDER (CISCO) — SCURRY COUNTY, TEXAS
JAP BECK LEASE 100.0000 NI **** 0.7 **** 0.1 **** 0.1
89 PDP Oil 138 0.0000 WI **** 3.7 **** 0.0 **** 0.0 **** 0.0
KELLY-SNYDER & REVILO (VARIOUS) — SCURRY COUNTY, TEXAS
SACROC, BROWN JW & REVILO GLO 100.0000 NI **** 1,009.8 **** 287.1 **** 253.1
90 PDP Oil 85 0.0000 WI **** 24.8 **** 237.3 **** 2.8 **** 2.5
REVILO (GLORIETA) — SCURRY COUNTY, TEXAS
BOYLES G D (TRUST) 100.0000 NI **** 7.5 **** 0.4 **** 0.4
91 PDP Oil 114 0.0000 WI **** 14.8 **** 0.3 **** 0.0 **** 0.0
BOYD S E (CONGLOMERATE) — STONEWALL COUNTY, TEXAS
BOYD CONGLOMERATE UNIT 100.0000 NI **** 6.4 **** 0.1 **** 0.1
92 PDP Oil 87 0.0000 WI **** 4.3 **** 13.4 **** 0.0 **** 0.0
ADAIR (SAN ANDRES, WOLFCAMP) — TERRY COUNTY, TEXAS
ADAIR SAN ANDRES & WOLFCAMP U 100.0000 NI **** 173.0 **** 40.0 **** 35.3
93 PDP Oil 88 0.0000 WI **** 44.9 **** 6.8 **** 0.0 **** 0.0
EAST TEXAS (VARIOUS) — UPSHUR COUNTY, TEXAS
BLAND & FREE PROPERTIES 100.0000 NI **** 12.3 **** 1.8 **** 1.6
94 PDP Oil 89 0.0000 WI **** 23.2 **** 84.2 **** 9.2 **** 8.1
EAST TEXAS — UPSHUR COUNTY, TEXAS
EDWARDS, EDWARDS ETHEL, EDWAR 100.0000 NI **** 85.0 **** 1.5 **** 1.3
95 PDP Gas 116 0.0000 WI **** 17.1 **** 191.2 **** 6.3 **** 5.5
WHITE OAK (COTTON VALLEY) — UPSHUR COUNTY, TEXAS
HAMPTON HOWARD (TRUST) 1 100.0000 NI **** 15.3 **** 1.9 **** 1.6
96 PDP Oil 117 0.0000 WI **** 40.2 **** 64.1 **** 17.1 **** 15.1
ADAMC (BEND) — UPTON COUNTY, TEXAS
ADAMC BEND UNIT 100.0000 NI **** 0.0 **** 0.0 **** 0.0
97 PDP Gas 90 0.0000 WI **** 4.8 **** 2.5 **** 0.1 **** 0.1

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: YE2020 1/29/2021 : 4:04:05 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.
Cawley, Gillespie & Associates, Inc.
Page 7

Table II - Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

Various Counties, Texas

As of December 31, 2020

LEASE NAME Start CurrentInterest Life UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL/MMCF M / M M / M M / M M M
MCELROY — UPTON COUNTY, TEXAS
CRIER MCELROY (TRUST) 100.0000 NI **** 1,342.4 **** 228.7 **** 201.6
98 PDP Oil 118 0.0000 WI **** 44.6 **** 133.3 **** 22.6 **** 19.8
MCCLINTIC (TRUST) 1 0.0000 NI **** 135.1 **** 0.0 **** 0.0
99 PDP Oil 119 0.0000 WI **** 0.0 **** 6.6 **** 0.0 **** 0.0
VAN — VAN ZANDT COUNTY, TEXAS
JARMAN WT, MORRIS WE, MURPHRE 100.0000 NI **** 37.3 **** 2.0 **** 1.8
100 PDP Oil 121 0.0000 WI **** 35.4 **** 52.8 **** 0.7 **** 0.6
VAN (RODESSA) — VAN ZANDT COUNTY, TEXAS
S V RUC UNIT 100.0000 NI **** 11.2 **** 0.1 **** 0.1
101 PDP Oil 124 0.0000 WI **** 7.6 **** 16.4 **** 0.0 **** 0.0
VAN — VAN ZANDT COUNTY, TEXAS
WELLS R L 46 (TRUST) 0.0000 NI **** 0.1 **** 0.0 **** 0.0
102 PDP Gas 123 0.0000 WI **** 0.0 **** 0.8 **** 0.0 **** 0.0
VAN & VAN SW — VAN ZANDT COUNTY, TEXAS
CENTRAL VAN WOODBINE UNIT & O 100.0000 NI **** 269.8 **** 6.7 **** 5.9
103 PDP Oil 91 0.0000 WI **** 23.4 **** 120.0 **** 3.1 **** 2.7
KATY — WALLER COUNTY, TEXAS
CONSOLIDATED & KATY GAS FIELD 0.0000 NI **** 0.2 **** 0.0 **** 0.0
104 PDP Gas 92 0.0000 WI **** 0.0 **** 1,148.7 **** 0.0 **** 0.0
JANELLE SE (TUBB) — WARD COUNTY, TEXAS
EDWARDS FEE ETAL & EDWARDS B 100.0000 NI **** 42.8 **** 9.8 **** 8.6
105 PDP Gas 125 0.0000 WI **** 22.9 **** 346.9 **** 40.2 **** 35.3
WARD-ESTES, WARD-ESTES NORTH (VARIOUS) — WARD COUNTY, TEXAS
VARIOUS MARTIN PROPERTIES 100.0000 NI **** 24.4 **** 1.2 **** 1.1
106 PDP Gas 93 0.0000 WI **** 21.8 **** 259.8 **** 21.2 **** 18.7
EMPEROR (SIMPSON) — WINKLER COUNTY, TEXAS
EMPEROR 24 0.0000 NI **** 0.0 **** 0.0 **** 0.0
107 PDP Gas 1 133 0.0000 WI **** 0.0 **** 23.2 **** 0.0 **** 0.0
EMPEROR & HALLEY (YATES) — WINKLER COUNTY, TEXAS
MCCABE FP 100.0000 NI **** 57.1 **** 0.5 **** 0.4
108 PDP Oil 3 0.0000 WI **** 15.8 **** 249.6 **** 0.1 **** 0.1
EMPEROR, EMPEROR EAST (VARIOUS) — WINKLER COUNTY, TEXAS
VARIOUS BROWN ALTMAN PROPERTI 100.0000 NI **** 0.0 **** 0.0 **** 0.0
109 PDP Gas 5 0.0000 WI **** 6.2 **** 791.6 **** 2.2 **** 1.9
EMPEROR, KERMIT, WEINER (VARIOUS) — WINKLER COUNTY, TEXAS
VARIOUS BROWN-ALTMAN PROPERTI 100.0000 NI **** 114.9 **** 16.3 **** 14.4
110 PDP Oil 126 0.0000 WI **** 44.3 **** 2,219.7 **** 165.4 **** 145.5
HALLEY, EMPEROR, WEINER (VARIOUS) — WINKLER COUNTY, TEXAS
HALLEY UNIT & OTHER HALLEY 100.0000 NI **** 342.6 **** 9.8 **** 8.6
111 PDP Gas 4 0.0000 WI **** 12.5 **** 6,006.3 **** 127.4 **** 112.1

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: YE2020 1/29/2021 : 4:04:05 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.
Cawley, Gillespie & Associates, Inc.
Page 8

Table II - Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

Various Counties, Texas

As of December 31, 2020

LEASE NAME Start CurrentInterest Life UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL/MMCF M / M M / M M / M M M
HENDRICK (VARIOUS) — WINKLER COUNTY, TEXAS
HENDRICK TG & OTHER HENDRICK 100.0000 NI **** 159.8 **** 60.6 **** 53.4
112 PDP Oil 6 0.0000 WI **** 49.9 **** 157.6 **** 21.5 **** 18.9
TB HENDRICK #3 & ’A’ #2 0.0000 NI **** 75.2 **** 0.0 **** 0.0
113 PDP Oil 127 0.0000 WI **** 0.0 **** 111.3 **** 0.0 **** 0.0
KEYSTONE (COLBY, MCKEE, SILUR) — WINKLER COUNTY, TEXAS
JENKINS VARIOUS 100.0000 NI **** 354.0 **** 21.0 **** 18.5
114 PDP Oil 8 0.0000 WI **** 34.3 **** 870.7 **** 24.0 **** 21.1
KEYSTONE (HOLT) — WINKLER COUNTY, TEXAS
KEYSTONE HOLT UNIT 100.0000 NI **** 105.0 **** 20.3 **** 17.9
115 PDP Oil 9 0.0000 WI 36.8 182.6 14.9 13.1
KEYSTONE (COLBY, MCKEE) — WINKLER COUNTY, TEXAS
MCCUTCHEN W A VARIOUS 100.0000 NI **** 12.4 **** 1.1 **** 1.0
116 PDP Oil 128 0.0000 WI **** 22.5 **** 85.0 **** 18.7 **** 16.4
KEYSTONE (ELLENBURGER) — WINKLER COUNTY, TEXAS
SO KEYSTONE ELLENBURGER UNIT 100.0000 NI **** 43.9 **** 0.0 **** 0.0
117 PDP Gas 10 0.0000 WI 15.6 1,608.2 75.0 66.0
KEYSTONE (VARIOUS) — WINKLER COUNTY, TEXAS
SO KEYSTONE SILURIAN UNIT 100.0000 NI **** 5.5 **** 1.5 **** 1.4
118 PDP Oil 7 0.0000 WI 12.8 12.0 0.7 0.6
KEYSTONE (DEVONIAN, SILURIAN) — WINKLER COUNTY, TEXAS
TALVEZ (7) (TRUST) 0.0000 NI **** 9.1 **** 0.0 **** 0.0
119 PDP Gas 129 0.0000 WI 0.0 501.2 0.0 0.0
OWNBY (SAN ANDRES & CLRFK) — YOAKUM COUNTY, TEXAS
OWNBY SADR & CENTRAL OWNBY UN 100.0000 NI **** 121.2 **** 4.0 **** 3.5
120 PDP Oil 14 0.0000 WI 21.0 47.6 0.1 0.1
WASSON (VARIOUS) — YOAKUM COUNTY, TEXAS
BENNETT RANCH UNIT 100.0000 NI **** 751.6 **** 133.9 **** 118.0
121 PDP Oil 130 0.0000 WI 34.5 221.6 12.3 10.8
DENVER UNIT 100.0000 NI **** 2,633.9 **** 784.9 **** 691.8
122 PDP Oil 13 0.0000 WI 49.8 1,958.5 241.7 212.7
WOOTEN H 0.0000 NI **** 102.7 **** 0.0 **** 0.0
123 PDP Oil 131 0.0000 WI 0.0 36.3 0.0 0.0
WASSON & WASSON NORTHEAST (VARIOUS) — YOAKUM COUNTY, TEXAS
WASSON NORTH CLFK UNIT 100.0000 NI **** 106.0 **** 18.7 **** 16.5
124 PDP Oil 15 0.0000 WI 33.8 2.3 0.0 0.0
WASSON (WICHITA ALBANY) — YOAKUM COUNTY, TEXAS
MILLER ANNIE, STEVENS SUE & S 100.0000 NI **** 779.7 **** 10.5 **** 9.3
125 PDP Oil 16 0.0000 WI 31.9 600.8 0.3 0.3
WASSON 72 (VARIOUS) — YOAKUM COUNTY, TEXAS
YOAKUM WASSON CLEARFORK UNIT 100.0000 NI **** 113.9 **** 32.9 **** 29.0
126 PDP Oil 17 0.0000 WI 28.6 3.2 0.8 0.7

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: YE2020 1/29/2021 : 4:04:05 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.
Cawley, Gillespie & Associates, Inc.
Page 9

Table II - Proved (cont.)

Lease Reserve Summary

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

Various Counties, Texas

As of December 31, 2020

LEASE NAME Start CurrentInterest Life UltimateRecovery GrossReserves NetReserves Oil RevenueGas Revenue Prod TaxAdv. Tax ExpensesInvestments Future NetCash Flow Cash FlowDisc.@ 10.0
Table Class Major Well No. Date ASN % MBBL/MMCF M / M M / M M / M M M
WASSON NORTHEAST (CLEARFORK) — YOAKUM COUNTY, TEXAS
EAST WASSON CLEARFORK UNIT 100.0000 NI **** 3.0 **** 0.3 **** 0.3
127 PDP Oil 137 0.0000 WI **** 10.1 **** 0.0 **** 0.0 **** 0.0
GRAND TOTAL **** 22,770.4 **** 3,381.2 **** 2,980.1
**** 43,947.4 **** 1,816.3 **** 1,598.0

All values are in US Dollars.

THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. Scenario: YE2020 1/29/2021 : 4:04:05 PM
TEXAS REGISTERED ENGINEERING FIRM F-693.
Cawley, Gillespie & Associates, Inc.
Page 10

Rate-Time History-Forecast Curves

And

TabularReserves and Economics

By Property

Cawley, Gillespie & Associates, Inc.

Petroleum Consultants

LOGO

Table 1

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— DEEP ROCK A & SHAFTER LAKE SADR

DEEP ROCK & SHAFTER LAKE (VARIOUS) FIELD — ANDREWS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 2.319
**** 12-2022 **** 2.076
**** 12-2023 **** 1.863
**** 12-2024 **** 1.676
**** 12-2025 **** 1.512
**** 12-2026 **** 1.366
**** 12-2027 **** 1.237
**** 12-2028 **** 1.122
**** 12-2029 **** 1.019
**** 12-2030 **** 0.928
**** 12-2031 **** 0.846
**** 12-2032 **** 0.773
**** 12-2033 **** 0.708
**** 12-2034 **** 0.649
**** 12-2035 **** 0.595
**** S Tot **** 18.688
**** After **** 7.129
**** Total **** 25.818
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 607.640
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 455.317
**** Revenue **** 15.00 **** 368.690
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 312.443
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 272.810
**** 30.00 **** 243.295
API:    CODE:
--- ---
PROPNUM: L8BB136D00 12 Months in first year
50.000 Year Life (01/2071)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 28 YE2020    01/29/2021    15:43:14
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 1

Cawley, Gillespie & Associates, Inc.

LOGO

Table 2

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MILES B, MILES HAYDEN, SOUTHLAND

DEEP ROCK & WALLEN (VARIOUS) FIELD — ANDREWS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.345
**** 12-2022 **** 0.327
**** 12-2023 **** 0.311
**** 12-2024 **** 0.295
**** 12-2025 **** 0.280
**** 12-2026 **** 0.267
**** 12-2027 **** 0.253
**** 12-2028 **** 0.241
**** 12-2029 **** 0.228
**** 12-2030 **** 0.217
**** 12-2031 **** 0.206
**** 12-2032 **** 0.196
**** 12-2033 **** 0.186
**** 12-2034 **** 0.177
**** 12-2035 **** 0.168
**** S Tot **** 3.697
**** After **** 2.574
**** Total **** 6.272
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 127.995
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 88.089
**** Revenue **** 15.00 **** 67.654
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 55.334
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 47.104
**** 30.00 **** 41.214
API:    CODE:
--- ---
PROPNUM: L8BB12HE00 12 Months in first year
47.000 Year Life (01/2068)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 1 YE2020    01/29/2021    15:43:15
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 2

Cawley, Gillespie & Associates, Inc.

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Table 3

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— DOLLARHIDE & N. DOLLARHIDE UNITS

DOLLARHIDE (VARIOUS) FIELD — ANDREWS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 3.810
**** 12-2022 **** 3.620
**** 12-2023 **** 3.438
**** 12-2024 **** 3.266
**** 12-2025 **** 3.103
**** 12-2026 **** 2.948
**** 12-2027 **** 2.801
**** 12-2028 **** 2.661
**** 12-2029 **** 2.528
**** 12-2030 **** 2.402
**** 12-2031 **** 2.281
**** 12-2032 **** 2.167
**** 12-2033 **** 2.059
**** 12-2034 **** 1.956
**** 12-2035 **** 1.858
**** S Tot **** 40.898
**** After **** 27.496
**** Total **** 68.394
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 1,439.687
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 993.034
**** Revenue **** 15.00 **** 762.964
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 624.074
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 531.255
**** 30.00 **** 464.824
API:    CODE:
--- ---
PROPNUM: L8BB13IE00 12 Months in first year
44.417 Year Life (06/2065)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 36 YE2020    01/29/2021    15:43:15
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 3

Cawley, Gillespie & Associates, Inc.

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Table 4

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

OXY USA WTP — FAST DOLLAR

DOLLARHIDE (CLEAR FORK) FIELD — ANDREWS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.114
**** 12-2022 **** 0.074
**** 12-2023 **** 0.052
**** 12-2024 **** 0.038
**** 12-2025 **** 0.028
**** 12-2026 **** 0.015
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.321
**** After **** 0.000
**** Total **** 0.321
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 10.914
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 10.038
**** Revenue **** 15.00 **** 9.307
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 8.689
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 8.160
**** 30.00 **** 7.704
API: 4200347898    CODE:
--- ---
PROPNUM: UBELS8SE46 12 Months in first year
5.667 Year Life (09/2026)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 141 YE2020    01/29/2021    15:43:15
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 4

Cawley, Gillespie & Associates, Inc.

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Table 5

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

OXY USA WTP — QUICK DOLLAR

DOLLARHIDE (CLEAR FORK) FIELD — ANDREWS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.158
**** 12-2022 **** 0.094
**** 12-2023 **** 0.062
**** 12-2024 **** 0.043
**** 12-2025 **** 0.032
**** 12-2026 **** 0.022
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.411
**** After **** 0.000
**** Total **** 0.411
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 14.013
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 12.940
**** Revenue **** 15.00 **** 12.043
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 11.284
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 10.634
**** 30.00 **** 10.072
API: 4200347899    CODE:
--- ---
PROPNUM: UBELSAID56 12 Months in first year
5.917 Year Life (12/2026)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 142 YE2020    01/29/2021    15:43:15
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 5

Cawley, Gillespie & Associates, Inc.

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Table 6

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— FULLERTON CLEARFORK UNIT

FULLERTON (CLEARFORK) FIELD — ANDREWS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 1.855
**** 12-2022 **** 1.716
**** 12-2023 **** 1.587
**** 12-2024 **** 1.468
**** 12-2025 **** 1.358
**** 12-2026 **** 1.257
**** 12-2027 **** 1.163
**** 12-2028 **** 1.075
**** 12-2029 **** 0.994
**** 12-2030 **** 0.920
**** 12-2031 **** 0.851
**** 12-2032 **** 0.787
**** 12-2033 **** 0.728
**** 12-2034 **** 0.673
**** 12-2035 **** 0.623
**** S Tot **** 17.056
**** After **** 5.120
**** Total **** 22.176
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 618.511
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 461.076
**** Revenue **** 15.00 **** 368.674
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 308.779
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 267.011
**** 30.00 **** 236.263
API:    CODE:
--- ---
PROPNUM: L8BB14AD00 12 Months in first year
29.083 Year Life (01/2050)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 57 YE2020    01/29/2021    15:43:15
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 6

Cawley, Gillespie & Associates, Inc.

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Table 7

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

RKG ENGINEERING COMPANY — MOBIL FEE #18-3 TRUST PRIMAL E

FULLERTON (WOLFCAMP) FIELD — ANDREWS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB159D00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 82 YE2020    01/29/2021    15:43:15
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 7

Cawley, Gillespie & Associates, Inc.

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Table 8

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— RALPH 3, 4, 6

FULLERTON (Various) FIELD — ANDREWS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.049
**** 12-2022 **** 0.047
**** 12-2023 **** 0.043
**** 12-2024 **** 0.040
**** 12-2025 **** 0.037
**** 12-2026 **** 0.034
**** 12-2027 **** 0.033
**** 12-2028 **** 0.030
**** 12-2029 **** 0.028
**** 12-2030 **** 0.026
**** 12-2031 **** 0.024
**** 12-2032 **** 0.022
**** 12-2033 **** 0.021
**** 12-2034 **** 0.019
**** 12-2035 **** 0.018
**** S Tot **** 0.471
**** After **** 0.094
**** Total **** 0.565
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 16.771
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 12.707
**** Revenue **** 15.00 **** 10.209
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 8.554
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 7.389
**** 30.00 **** 6.530
API:    CODE:
--- ---
PROPNUM: L8BB12AD00 12 Months in first year
21.917 Year Life (12/2042)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 20 YE2020    01/29/2021    15:43:15
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 8

Cawley, Gillespie & Associates, Inc.

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Table 9

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— WILSON H M ‘A‘ & ‘B‘

FULLERTON (DEVONIAN & ELLENBURG) FIELD — ANDREWS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.145
**** 12-2022 **** 0.139
**** 12-2023 **** 0.133
**** 12-2024 **** 0.127
**** 12-2025 **** 0.122
**** 12-2026 **** 0.115
**** 12-2027 **** 0.111
**** 12-2028 **** 0.106
**** 12-2029 **** 0.100
**** 12-2030 **** 0.096
**** 12-2031 **** 0.092
**** 12-2032 **** 0.088
**** 12-2033 **** 0.084
**** 12-2034 **** 0.080
**** 12-2035 **** 0.077
**** S Tot **** 1.616
**** After **** 1.300
**** Total **** 2.916
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 67.771
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 45.828
**** Revenue **** 15.00 **** 34.891
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 28.390
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 24.085
**** 30.00 **** 21.022
API:    CODE:
--- ---
PROPNUM: L8BB13HE00 12 Months in first year
50.000 Year Life (01/2071)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 35 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 9

Cawley, Gillespie & Associates, Inc.

LOGO

Table 10

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MEANS R M

MEANS (STRAWN, QUEEN, WOLFC) FIELD — ANDREWS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB130D00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 24 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 10

Cawley, Gillespie & Associates, Inc.

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Table 11

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MEANS SAN ANDRES UNIT

MEANS (SAN ANDRES) FIELD — ANDREWS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 3.100
**** 12-2022 **** 2.948
**** 12-2023 **** 2.801
**** 12-2024 **** 2.661
**** 12-2025 **** 2.528
**** 12-2026 **** 2.402
**** 12-2027 **** 2.281
**** 12-2028 **** 2.167
**** 12-2029 **** 2.059
**** 12-2030 **** 1.956
**** 12-2031 **** 1.858
**** 12-2032 **** 1.765
**** 12-2033 **** 1.677
**** 12-2034 **** 1.594
**** 12-2035 **** 1.513
**** S Tot **** 33.309
**** After **** 22.585
**** Total **** 55.894
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 1,147.327
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 790.900
**** Revenue **** 15.00 **** 607.570
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 496.936
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 423.006
**** 30.00 **** 370.095
API:    CODE:
--- ---
PROPNUM: L8BB13VE00 12 Months in first year
45.000 Year Life (01/2066)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 44 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 11

Cawley, Gillespie & Associates, Inc.

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Table 12

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— REINECKE UNIT & HOLBEIN I

REINECKE (Various) FIELD — BORDEN COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.056
**** 12-2022 **** 0.049
**** 12-2023 **** 0.044
**** 12-2024 **** 0.040
**** 12-2025 **** 0.036
**** 12-2026 **** 0.033
**** 12-2027 **** 0.030
**** 12-2028 **** 0.027
**** 12-2029 **** 0.025
**** 12-2030 **** 0.023
**** 12-2031 **** 0.021
**** 12-2032 **** 0.019
**** 12-2033 **** 0.018
**** 12-2034 **** 0.016
**** 12-2035 **** 0.015
**** S Tot **** 0.451
**** After **** 0.055
**** Total **** 0.506
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 20.247
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 15.858
**** Revenue **** 15.00 **** 13.038
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 11.106
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 9.714
**** 30.00 **** 8.667
API:    CODE:
--- ---
PROPNUM: L8BB14DD00 12 Months in first year
19.417 Year Life (06/2040)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 75 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 12

Cawley, Gillespie & Associates, Inc.

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Table 13

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— SNEED H G & GILBERT

HASTINGS EAST FIELD — BRAZORIA COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.031
**** 12-2022 **** 0.027
**** 12-2023 **** 0.025
**** 12-2024 **** 0.022
**** 12-2025 **** 0.020
**** 12-2026 **** 0.018
**** 12-2027 **** 0.016
**** 12-2028 **** 0.015
**** 12-2029 **** 0.013
**** 12-2030 **** 0.011
**** 12-2031 **** 0.006
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.204
**** After **** 0.000
**** Total **** 0.204
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 6.122
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 5.147
**** Revenue **** 15.00 **** 4.429
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 3.884
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 3.461
**** 30.00 **** 3.125
API:    CODE:
--- ---
PROPNUM: L8BB15VE00 12 Months in first year
10.583 Year Life (07/2031)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 97 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 13

Cawley, Gillespie & Associates, Inc.

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Table 14

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— WEST HASTINGS UNIT & SNEED

HASTINGS WEST & EAST FIELD — BRAZORIA COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 3.688
**** 12-2022 **** 3.445
**** 12-2023 **** 3.226
**** 12-2024 **** 3.027
**** 12-2025 **** 2.845
**** 12-2026 **** 2.680
**** 12-2027 **** 2.529
**** 12-2028 **** 2.389
**** 12-2029 **** 2.262
**** 12-2030 **** 2.143
**** 12-2031 **** 2.035
**** 12-2032 **** 1.933
**** 12-2033 **** 1.837
**** 12-2034 **** 1.745
**** 12-2035 **** 1.658
**** S Tot **** 37.441
**** After **** 23.873
**** Total **** 61.314
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 1,284.173
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 894.161
**** Revenue **** 15.00 **** 691.442
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 568.384
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 485.786
**** 30.00 **** 426.445
API:    CODE:
--- ---
PROPNUM: L8BB143D00 12 Months in first year
42.667 Year Life (09/2063)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 52 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 14

Cawley, Gillespie & Associates, Inc.

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Table 15

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MAXWELL MAUDE, FRANK BOYD, OTHER

SHERIFF (VARIOUS) FIELD — CALHOUN COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB15FD00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 86 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 15

Cawley, Gillespie & Associates, Inc.

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Table 16

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

C & E OPERATING INC — TPIC

SHERIFF (GRETA 5700) FIELD — CALHOUN COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API: 420573163100    CODE: 142,02
--- ---
PROPNUM: L8BB174D00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 132 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 16

Cawley, Gillespie & Associates, Inc.

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Table 17

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— COCKRELL RANCH 2, 3, 4

PANHANDLE (WOLFCAMP GRANITEWASH) FIELD — CARSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: PAULJKLE4H 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 140 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 17

Cawley, Gillespie & Associates, Inc.

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Table 18

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— VARIOUS EDWARDS CRANE COUNTY LEA

ARMER & CRAWAR (VARIOUS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.061
**** 12-2022 **** 0.058
**** 12-2023 **** 0.055
**** 12-2024 **** 0.052
**** 12-2025 **** 0.049
**** 12-2026 **** 0.047
**** 12-2027 **** 0.045
**** 12-2028 **** 0.042
**** 12-2029 **** 0.041
**** 12-2030 **** 0.038
**** 12-2031 **** 0.036
**** 12-2032 **** 0.034
**** 12-2033 **** 0.033
**** 12-2034 **** 0.031
**** 12-2035 **** 0.030
**** S Tot **** 0.651
**** After **** 0.358
**** Total **** 1.009
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 26.358
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 18.457
**** Revenue **** 15.00 **** 14.232
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 11.651
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 9.920
**** 30.00 **** 8.680
API:    CODE:
--- ---
PROPNUM: L8BB12CD00 12 Months in first year
34.667 Year Life (09/2055)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 21 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 18

Cawley, Gillespie & Associates, Inc.

LOGO

Table 19

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MCCLINTIC H L ETAL

MCELROY (BEND 8960) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.984
**** 12-2022 **** 0.900
**** 12-2023 **** 0.823
**** 12-2024 **** 0.754
**** 12-2025 **** 0.689
**** 12-2026 **** 0.631
**** 12-2027 **** 0.577
**** 12-2028 **** 0.528
**** 12-2029 **** 0.483
**** 12-2030 **** 0.442
**** 12-2031 **** 0.405
**** 12-2032 **** 0.370
**** 12-2033 **** 0.338
**** 12-2034 **** 0.310
**** 12-2035 **** 0.284
**** S Tot **** 8.518
**** After **** 1.869
**** Total **** 10.388
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 277.958
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 212.097
**** Revenue **** 15.00 **** 171.891
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 145.184
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 126.263
**** 30.00 **** 112.185
API:    CODE:
--- ---
PROPNUM: L8BB127D00 12 Months in first year
25.667 Year Life (09/2046)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 18 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 19

Cawley, Gillespie & Associates, Inc.

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Table 20

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— JUDKINS GAS UNIT 2

SAND HILLS (JUDKINS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 126.723
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 84.280
**** Revenue **** 15.00 **** 63.597
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 51.472
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 43.513
**** 30.00 **** 37.883
API:    CODE:
--- ---
PROPNUM: L8BB12WE00 12 Months in first year
50.000 Year Life (01/2071)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 11 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 20

Cawley, Gillespie & Associates, Inc.

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Table 21

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MCKNIGHT MB & MB A

SAND HILLS (MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 9.697
**** 12-2022 **** 8.426
**** 12-2023 **** 7.409
**** 12-2024 **** 6.578
**** 12-2025 **** 5.892
**** 12-2026 **** 5.301
**** 12-2027 **** 4.771
**** 12-2028 **** 4.294
**** 12-2029 **** 3.865
**** 12-2030 **** 3.478
**** 12-2031 **** 3.131
**** 12-2032 **** 2.817
**** 12-2033 **** 2.536
**** 12-2034 **** 2.282
**** 12-2035 **** 2.054
**** S Tot **** 72.529
**** After **** 8.129
**** Total **** 80.658
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 2,288.170
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 1,813.076
**** Revenue **** 15.00 **** 1,504.708
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 1,291.416
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 1,136.149
**** 30.00 **** 1,018.402
API:    CODE:
--- ---
PROPNUM: L8BB12IE00 12 Months in first year
20.500 Year Life (07/2041)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 2 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 21

Cawley, Gillespie & Associates, Inc.

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Table 22

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MCKNIGHT MB B&C

SAND HILLS (MCKNIGHT) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB151E00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 100 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 22

Cawley, Gillespie & Associates, Inc.

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Table 23

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— TUBB JB VARIOUS AND OTHER TUBB

SAND HILLS (VARIOUS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.341
**** 12-2022 **** 2.106
**** 12-2023 **** 1.896
**** 12-2024 **** 1.706
**** 12-2025 **** 1.535
**** 12-2026 **** 1.382
**** 12-2027 **** 1.244
**** 12-2028 **** 1.119
**** 12-2029 **** 1.007
**** 12-2030 **** 0.907
**** 12-2031 **** 0.816
**** 12-2032 **** 0.734
**** 12-2033 **** 0.661
**** 12-2034 **** 0.595
**** 12-2035 **** 0.536
**** S Tot **** 18.586
**** After **** 2.411
**** Total **** 20.997
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 963.328
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 757.461
**** Revenue **** 15.00 **** 625.194
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 534.320
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 468.471
**** 30.00 **** 418.701
API:    CODE:
--- ---
PROPNUM: L8BB15OE00 12 Months in first year
21.583 Year Life (07/2042)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 101 YE2020    01/29/2021    15:43:16
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 23

Cawley, Gillespie & Associates, Inc.

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Table 24

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— TUBB JBA A & B

SAND HILLS (JUDKINS & TUBB) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.004
**** 12-2022 **** 0.004
**** 12-2023 **** 0.004
**** 12-2024 **** 0.004
**** 12-2025 **** 0.003
**** 12-2026 **** 0.003
**** 12-2027 **** 0.003
**** 12-2028 **** 0.003
**** 12-2029 **** 0.003
**** 12-2030 **** 0.003
**** 12-2031 **** 0.003
**** 12-2032 **** 0.002
**** 12-2033 **** 0.002
**** 12-2034 **** 0.002
**** 12-2035 **** 0.002
**** S Tot **** 0.040
**** After **** 0.026
**** Total **** 0.066
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 11.736
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 8.103
**** Revenue **** 15.00 **** 6.227
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 5.093
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 4.336
**** 30.00 **** 3.794
API:    CODE:
--- ---
PROPNUM: L8BB12DD00 12 Months in first year
43.417 Year Life (06/2064)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 22 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 24

Cawley, Gillespie & Associates, Inc.

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Table 25

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— WADDELL W N (TRUST)

SAND HILLS (VARIOUS) FIELD — CRANE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB15DD00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 102 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 25

Cawley, Gillespie & Associates, Inc.

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Table 26

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— VARIOUS TODD PROPERTIES

TODD, TODD DEEP, DOUBLE R (CRINOIDAL, ELLENBRGR) FIELD — CROCKETT COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.257
**** 12-2022 **** 2.009
**** 12-2023 **** 1.788
**** 12-2024 **** 1.591
**** 12-2025 **** 1.416
**** 12-2026 **** 1.260
**** 12-2027 **** 1.122
**** 12-2028 **** 0.999
**** 12-2029 **** 0.888
**** 12-2030 **** 0.791
**** 12-2031 **** 0.704
**** 12-2032 **** 0.627
**** 12-2033 **** 0.558
**** 12-2034 **** 0.496
**** 12-2035 **** 0.442
**** S Tot **** 16.948
**** After **** 1.395
**** Total **** 18.343
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 514.673
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 411.935
**** Revenue **** 15.00 **** 343.861
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 296.086
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 260.952
**** 30.00 **** 234.118
API:    CODE:
--- ---
PROPNUM: L8BB12FD00 12 Months in first year
19.250 Year Life (04/2040)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 23 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 26

Cawley, Gillespie & Associates, Inc.

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Table 27

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— BLAKENEY BH A,B,C, SUN & SMITH

COWDEN NORTH (DEEP) FIELD — ECTOR COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.112
**** 12-2022 **** 0.105
**** 12-2023 **** 0.098
**** 12-2024 **** 0.092
**** 12-2025 **** 0.085
**** 12-2026 **** 0.080
**** 12-2027 **** 0.075
**** 12-2028 **** 0.071
**** 12-2029 **** 0.065
**** 12-2030 **** 0.062
**** 12-2031 **** 0.057
**** 12-2032 **** 0.054
**** 12-2033 **** 0.050
**** 12-2034 **** 0.047
**** 12-2035 **** 0.044
**** S Tot **** 1.096
**** After **** 0.473
**** Total **** 1.570
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 36.100
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 26.105
**** Revenue **** 15.00 **** 20.548
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 17.051
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 14.655
**** 30.00 **** 12.912
API:    CODE:
--- ---
PROPNUM: L8BB13FD00 12 Months in first year
35.667 Year Life (09/2056)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 34 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 27

Cawley, Gillespie & Associates, Inc.

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Table 28

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— COWDEN JM R/A A B & C

COWDEN NORTH (DEEP) FIELD — ECTOR COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 6.023
**** 12-2022 **** 5.434
**** 12-2023 **** 4.949
**** 12-2024 **** 4.542
**** 12-2025 **** 4.179
**** 12-2026 **** 3.845
**** 12-2027 **** 3.537
**** 12-2028 **** 3.254
**** 12-2029 **** 2.993
**** 12-2030 **** 2.754
**** 12-2031 **** 2.534
**** 12-2032 **** 2.331
**** 12-2033 **** 2.144
**** 12-2034 **** 1.973
**** 12-2035 **** 1.815
**** S Tot **** 52.306
**** After **** 12.928
**** Total **** 65.234
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 1,991.571
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 1,507.888
**** Revenue **** 15.00 **** 1,216.774
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 1,025.197
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 890.321
**** 30.00 **** 790.395
API:    CODE:
--- ---
PROPNUM: L8BB13CD00 12 Months in first year
26.583 Year Life (07/2047)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 32 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 28

Cawley, Gillespie & Associates, Inc.

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Table 29

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— NORTH COWDEN UNIT

COWDEN NORTH (Various) FIELD — ECTOR COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.441
**** 12-2022 **** 1.355
**** 12-2023 **** 1.274
**** 12-2024 **** 1.197
**** 12-2025 **** 1.126
**** 12-2026 **** 1.058
**** 12-2027 **** 0.994
**** 12-2028 **** 0.934
**** 12-2029 **** 0.879
**** 12-2030 **** 0.826
**** 12-2031 **** 0.776
**** 12-2032 **** 0.730
**** 12-2033 **** 0.686
**** 12-2034 **** 0.644
**** 12-2035 **** 0.606
**** S Tot **** 14.525
**** After **** 7.110
**** Total **** 21.635
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 488.203
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 348.337
**** Revenue **** 15.00 **** 272.167
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 224.828
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 192.642
**** 30.00 **** 169.342
API:    CODE:
--- ---
PROPNUM: L8BB13ED00 12 Months in first year
37.333 Year Life (04/2058)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 33 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 29

Cawley, Gillespie & Associates, Inc.

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Table 30

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— FOSTER C & D

FOSTER (GRAYBURG) FIELD — ECTOR COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.456
**** 12-2022 **** 0.412
**** 12-2023 **** 0.374
**** 12-2024 **** 0.338
**** 12-2025 **** 0.306
**** 12-2026 **** 0.277
**** 12-2027 **** 0.250
**** 12-2028 **** 0.227
**** 12-2029 **** 0.205
**** 12-2030 **** 0.186
**** 12-2031 **** 0.168
**** 12-2032 **** 0.152
**** 12-2033 **** 0.137
**** 12-2034 **** 0.124
**** 12-2035 **** 0.113
**** S Tot **** 3.726
**** After **** 0.545
**** Total **** 4.270
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 114.254
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 89.195
**** Revenue **** 15.00 **** 73.265
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 62.405
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 54.580
**** 30.00 **** 48.692
API:    CODE:
--- ---
PROPNUM: L8BB137D00 12 Months in first year
22.083 Year Life (01/2043)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 29 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 30

Cawley, Gillespie & Associates, Inc.

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Table 31

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— GOLDSMITH SAN ANDRES UNIT

GOLDSMITH (SAN ANDRES) FIELD — ECTOR COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.876
**** 12-2022 **** 1.698
**** 12-2023 **** 1.536
**** 12-2024 **** 1.391
**** 12-2025 **** 1.259
**** 12-2026 **** 1.139
**** 12-2027 **** 1.031
**** 12-2028 **** 0.932
**** 12-2029 **** 0.844
**** 12-2030 **** 0.764
**** 12-2031 **** 0.692
**** 12-2032 **** 0.626
**** 12-2033 **** 0.567
**** 12-2034 **** 0.512
**** 12-2035 **** 0.464
**** S Tot **** 15.330
**** After **** 2.414
**** Total **** 17.744
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 520.441
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 405.284
**** Revenue **** 15.00 **** 332.524
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 283.091
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 247.542
**** 30.00 **** 220.814
API:    CODE:
--- ---
PROPNUM: L8BB139D00 12 Months in first year
22.917 Year Life (12/2043)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 30 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 31

Cawley, Gillespie & Associates, Inc.

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Table 32

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— WEST JORDAN UNIT

JORDAN (Various) FIELD — ECTOR COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice OilRevenue GasRevenue Total<br>Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.189
**** 12-2022 **** 0.160
**** 12-2023 **** 0.136
**** 12-2024 **** 0.115
**** 12-2025 **** 0.097
**** 12-2026 **** 0.082
**** 12-2027 **** 0.069
**** 12-2028 **** 0.058
**** 12-2029 **** 0.049
**** 12-2030 **** 0.041
**** 12-2031 **** 0.035
**** 12-2032 **** 0.030
**** 12-2033 **** 0.026
**** 12-2034 **** 0.013
**** 12-2035 **** 0.000
**** S Tot **** 1.101
**** After **** 0.000
**** Total **** 1.101
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 33.645
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 28.427
**** Revenue **** 15.00 **** 24.643
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 21.799
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 19.598
**** 30.00 **** 17.850
API:    CODE:
--- ---
PROPNUM: L8BB134D00 12 Months in first year
13.583 Year Life (07/2034)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 27 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 32

Cawley, Gillespie & Associates, Inc.

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Table 33

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— CONNELL W E VARIOUS

JORDAN, PENWELL (VARIOUS) FIELD — ECTOR COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.019
**** 12-2022 **** 0.018
**** 12-2023 **** 0.017
**** 12-2024 **** 0.015
**** 12-2025 **** 0.014
**** 12-2026 **** 0.013
**** 12-2027 **** 0.012
**** 12-2028 **** 0.011
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.120
**** After **** 0.000
**** Total **** 0.120
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 3.705
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 3.194
**** Revenue **** 15.00 **** 2.799
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 2.487
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 2.237
**** 30.00 **** 2.034
API:     CODE:
--- ---
PROPNUM: L8BB160D00 12 Months in first year
8.000 Year Life (01/2029)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 103 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 33

Cawley, Gillespie & Associates, Inc.

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Table 34

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— PENWELL UNIT

PENWELL (CLEARFORK) FIELD — ECTOR COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.291
**** 12-2022 **** 0.272
**** 12-2023 **** 0.254
**** 12-2024 **** 0.238
**** 12-2025 **** 0.222
**** 12-2026 **** 0.208
**** 12-2027 **** 0.194
**** 12-2028 **** 0.182
**** 12-2029 **** 0.170
**** 12-2030 **** 0.159
**** 12-2031 **** 0.149
**** 12-2032 **** 0.139
**** 12-2033 **** 0.130
**** 12-2034 **** 0.122
**** 12-2035 **** 0.114
**** S Tot **** 2.842
**** After **** 1.162
**** Total **** 4.004
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 93.821
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 68.073
**** Revenue **** 15.00 **** 53.632
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 44.517
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 38.265
**** 30.00 **** 33.712
API:     CODE:
--- ---
PROPNUM: L8BB133D00 12 Months in first year
33.500 Year Life (07/2054)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 26 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 34

Cawley, Gillespie & Associates, Inc.

LOGO

Table 35

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— CEDAR LAKE UNIT & BREMONT

CEDAR LAKE (SILURIAN) FIELD — GAINES COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.463
**** 12-2022 **** 2.327
**** 12-2023 **** 2.199
**** 12-2024 **** 2.077
**** 12-2025 **** 1.964
**** 12-2026 **** 1.855
**** 12-2027 **** 1.754
**** 12-2028 **** 1.657
**** 12-2029 **** 1.566
**** 12-2030 **** 1.480
**** 12-2031 **** 1.399
**** 12-2032 **** 1.321
**** 12-2033 **** 1.249
**** 12-2034 **** 1.180
**** 12-2035 **** 1.115
**** S Tot **** 25.605
**** After **** 14.676
**** Total **** 40.281
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 864.602
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 606.894
**** Revenue **** 15.00 **** 470.302
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 386.622
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 330.211
**** 30.00 **** 289.605
API:     CODE:
--- ---
PROPNUM: L8BB13SE00 12 Months in first year
40.667 Year Life (09/2061)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 42 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 35

Cawley, Gillespie & Associates, Inc.

LOGO

Table 36

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— JENKINS UNIT, PROCTOR, NOLLEY WL

JENKINS, BAKER, NOLLEY (SAN ANDRES & WLFCMP) FIELD — GAINES COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.077
**** 12-2022 **** 1.984
**** 12-2023 **** 1.895
**** 12-2024 **** 1.809
**** 12-2025 **** 1.728
**** 12-2026 **** 1.650
**** 12-2027 **** 1.576
**** 12-2028 **** 1.505
**** 12-2029 **** 1.437
**** 12-2030 **** 1.372
**** 12-2031 **** 1.311
**** 12-2032 **** 1.252
**** 12-2033 **** 1.195
**** 12-2034 **** 1.141
**** 12-2035 **** 1.090
**** S Tot **** 23.024
**** After **** 18.522
**** Total **** 41.546
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 822.417
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 556.136
**** Revenue **** 15.00 **** 423.408
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 344.525
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 292.279
**** 30.00 **** 255.108
API:     CODE:
--- ---
PROPNUM: L8BB13QE00 12 Months in first year
50.000 Year Life (01/2071)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 41 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 36

Cawley, Gillespie & Associates, Inc.

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Table 37

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— AVERITT & RILEY TS

SEMINOLE (SAN ANGELO) FIELD — GAINES COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.253
**** 12-2022 **** 0.241
**** 12-2023 **** 0.228
**** 12-2024 **** 0.217
**** 12-2025 **** 0.206
**** 12-2026 **** 0.196
**** 12-2027 **** 0.186
**** 12-2028 **** 0.177
**** 12-2029 **** 0.168
**** 12-2030 **** 0.160
**** 12-2031 **** 0.152
**** 12-2032 **** 0.144
**** 12-2033 **** 0.137
**** 12-2034 **** 0.130
**** 12-2035 **** 0.123
**** S Tot **** 2.716
**** After **** 1.935
**** Total **** 4.651
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 93.962
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 64.579
**** Revenue **** 15.00 **** 49.588
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 40.557
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 34.524
**** 30.00 **** 30.207
API:    CODE:
--- ---
PROPNUM: L8BB13NE00 12 Months in first year
48.917 Year Life (12/2069)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 39 YE2020    01/29/2021    15:43:17
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 37

Cawley, Gillespie & Associates, Inc.

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Table 38

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— SEMINOLE SAN ANDRES & DEEP UNITS

SEMINOLE (SAN ANDRES & DEEP) FIELD — GAINES COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 6.073
**** 12-2022 **** 5.814
**** 12-2023 **** 5.553
**** 12-2024 **** 5.302
**** 12-2025 **** 5.064
**** 12-2026 **** 4.836
**** 12-2027 **** 4.618
**** 12-2028 **** 4.410
**** 12-2029 **** 4.212
**** 12-2030 **** 4.023
**** 12-2031 **** 3.842
**** 12-2032 **** 3.668
**** 12-2033 **** 3.503
**** 12-2034 **** 3.346
**** 12-2035 **** 3.195
**** S Tot **** 67.459
**** After **** 54.278
**** Total **** 121.737
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 2,374.315
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 1,605.383
**** Revenue **** 15.00 **** 1,222.106
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 994.319
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 843.452
**** 30.00 **** 736.117
API:    CODE:
--- ---
PROPNUM: L8BB13LE00 12 Months in first year
50.000 Year Life (01/2071)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 38 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 38

Cawley, Gillespie & Associates, Inc.

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Table 39

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— VARIOUS SEMINOLE PROPERTIES

SEMINOLE (SADR, WFCMP, DEVON) FIELD — GAINES COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB13PE00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 40 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 39

Cawley, Gillespie & Associates, Inc.

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Table 40

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— W SEMINOLE SA UNIT & VARIOUS PRO

SEMINOLE WEST (VARIOUS) FIELD — GAINES COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 5.924
**** 12-2022 **** 5.245
**** 12-2023 **** 4.701
**** 12-2024 **** 4.254
**** 12-2025 **** 3.882
**** 12-2026 **** 3.568
**** 12-2027 **** 3.298
**** 12-2028 **** 3.065
**** 12-2029 **** 2.861
**** 12-2030 **** 2.682
**** 12-2031 **** 2.522
**** 12-2032 **** 2.381
**** 12-2033 **** 2.253
**** 12-2034 **** 2.137
**** 12-2035 **** 2.031
**** S Tot **** 50.804
**** After **** 25.606
**** Total **** 76.411
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 1,712.423
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 1,234.612
**** Revenue **** 15.00 **** 975.876
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 815.048
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 705.266
**** 30.00 **** 625.319
API:    CODE:
--- ---
PROPNUM: L8BB13KE00 12 Months in first year
36.250 Year Life (04/2057)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 37 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 40

Cawley, Gillespie & Associates, Inc.

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Table 41

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— GAINES WASSON CLEARFORK UNIT & B

WASSON 72 (Various) FIELD — GAINES COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.250
**** 12-2022 **** 2.070
**** 12-2023 **** 1.905
**** 12-2024 **** 1.752
**** 12-2025 **** 1.612
**** 12-2026 **** 1.483
**** 12-2027 **** 1.364
**** 12-2028 **** 1.255
**** 12-2029 **** 1.155
**** 12-2030 **** 1.062
**** 12-2031 **** 0.977
**** 12-2032 **** 0.899
**** 12-2033 **** 0.828
**** 12-2034 **** 0.761
**** 12-2035 **** 0.701
**** S Tot **** 20.075
**** After **** 5.153
**** Total **** 25.228
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 630.926
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 476.075
**** Revenue **** 15.00 **** 383.307
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 322.415
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 279.610
**** 30.00 **** 247.928
API:    CODE:
--- ---
PROPNUM: L8BB13WE00 12 Months in first year
27.250 Year Life (04/2048)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 45 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 41

Cawley, Gillespie & Associates, Inc.

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Table 42

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— WASSON SOUTH CLEARFORK UNIT

WASSON 72 (Various) FIELD — GAINES COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.139
**** 12-2022 **** 1.048
**** 12-2023 **** 0.963
**** 12-2024 **** 0.887
**** 12-2025 **** 0.815
**** 12-2026 **** 0.750
**** 12-2027 **** 0.690
**** 12-2028 **** 0.635
**** 12-2029 **** 0.584
**** 12-2030 **** 0.538
**** 12-2031 **** 0.494
**** 12-2032 **** 0.455
**** 12-2033 **** 0.419
**** 12-2034 **** 0.385
**** 12-2035 **** 0.354
**** S Tot **** 10.157
**** After **** 2.556
**** Total **** 12.713
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 318.555
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 240.608
**** Revenue **** 15.00 **** 193.796
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 163.032
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 141.394
**** 30.00 **** 125.376
API:    CODE:
--- ---
PROPNUM: L8BB13TE00 12 Months in first year
26.833 Year Life (10/2047)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 43 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 42

Cawley, Gillespie & Associates, Inc.

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Table 43

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— WASSON 48 (TRUST)

WASSON SOUTH (WICHITA ALBANY) FIELD — GAINES COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.082
**** 12-2022 **** 0.078
**** 12-2023 **** 0.072
**** 12-2024 **** 0.068
**** 12-2025 **** 0.064
**** 12-2026 **** 0.060
**** 12-2027 **** 0.056
**** 12-2028 **** 0.053
**** 12-2029 **** 0.050
**** 12-2030 **** 0.047
**** 12-2031 **** 0.044
**** 12-2032 **** 0.041
**** 12-2033 **** 0.039
**** 12-2034 **** 0.037
**** 12-2035 **** 0.034
**** S Tot **** 0.826
**** After **** 0.371
**** Total **** 1.197
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 27.252
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 19.562
**** Revenue **** 15.00 **** 15.309
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 12.652
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 10.842
**** 30.00 **** 9.531
API:    CODE:
--- ---
PROPNUM: L8BB161D00 12 Months in first year
33.667 Year Life (09/2054)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 104 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 43

Cawley, Gillespie & Associates, Inc.

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Table 44

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— COMBS, COMBS & WORLEY, OTHER GRA

PANHANDLE GRAY COUNTY FIELD — GRAY COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.842
**** 12-2022 **** 0.787
**** 12-2023 **** 0.736
**** 12-2024 **** 0.688
**** 12-2025 **** 0.643
**** 12-2026 **** 0.601
**** 12-2027 **** 0.562
**** 12-2028 **** 0.526
**** 12-2029 **** 0.492
**** 12-2030 **** 0.460
**** 12-2031 **** 0.430
**** 12-2032 **** 0.402
**** 12-2033 **** 0.375
**** 12-2034 **** 0.352
**** 12-2035 **** 0.329
**** S Tot **** 8.226
**** After **** 3.472
**** Total **** 11.697
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 325.548
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 235.925
**** Revenue **** 15.00 **** 185.867
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 154.308
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 132.661
**** 30.00 **** 116.898
API:    CODE:
--- ---
PROPNUM: L8BB163D00 12 Months in first year
34.750 Year Life (10/2055)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 105 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 44

Cawley, Gillespie & Associates, Inc.

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Table 45

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— PANHANDLE GRAY COUNTY VARIOUS

PANHANDLE GRAY COUNTY (VARIOUS) FIELD — GRAY COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.029
**** 12-2022 **** 0.026
**** 12-2023 **** 0.022
**** 12-2024 **** 0.020
**** 12-2025 **** 0.018
**** 12-2026 **** 0.016
**** 12-2027 **** 0.014
**** 12-2028 **** 0.012
**** 12-2029 **** 0.007
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.164
**** After **** 0.000
**** Total **** 0.164
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 7.377
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 6.365
**** Revenue **** 15.00 **** 5.587
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 4.977
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 4.489
**** 30.00 **** 4.093
API:    CODE:
--- ---
PROPNUM: L8BB130E00 12 Months in first year
8.667 Year Life (09/2029)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 46 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 45

Cawley, Gillespie & Associates, Inc.

LOGO

Table 46

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— BIG MINERAL CREEK UNITS

BIG MINERAL CREEK (VARIOUS) FIELD — GRAYSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.267
**** 12-2022 **** 0.252
**** 12-2023 **** 0.239
**** 12-2024 **** 0.226
**** 12-2025 **** 0.213
**** 12-2026 **** 0.201
**** 12-2027 **** 0.190
**** 12-2028 **** 0.180
**** 12-2029 **** 0.170
**** 12-2030 **** 0.160
**** 12-2031 **** 0.152
**** 12-2032 **** 0.144
**** 12-2033 **** 0.136
**** 12-2034 **** 0.128
**** 12-2035 **** 0.121
**** S Tot **** 2.778
**** After **** 1.518
**** Total **** 4.296
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 100.049
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 70.457
**** Revenue **** 15.00 **** 54.640
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 44.926
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 38.372
**** 30.00 **** 33.654
API:    CODE:
--- ---
PROPNUM: L8BB144D00 12 Months in first year
38.167 Year Life (03/2059)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 53 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 46

Cawley, Gillespie & Associates, Inc.

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Table 47

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— SOUTHLAND UNIT 1H

BIG MINERAL CREEK (WOODFORD) FIELD — GRAYSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.013
**** 12-2022 **** 0.011
**** 12-2023 **** 0.001
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.026
**** After **** 0.000
**** Total **** 0.026
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 1.662
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 1.589
**** Revenue **** 15.00 **** 1.523
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 1.464
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 1.410
**** 30.00 **** 1.361
API: 4218131510    CODE: 14209003
--- ---
PROPNUM: PAULJIHB3H 12 Months in first year
2.083 Year Life (01/2023)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 139 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 47

Cawley, Gillespie & Associates, Inc.

LOGO

Table 48

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— BROWN BETH-KIMBELL-BELL UNITS

SHERMAN EAST (PENN 7100) FIELD — GRAYSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.519
**** 12-2022 **** 0.495
**** 12-2023 **** 0.473
**** 12-2024 **** 0.452
**** 12-2025 **** 0.432
**** 12-2026 **** 0.412
**** 12-2027 **** 0.394
**** 12-2028 **** 0.376
**** 12-2029 **** 0.359
**** 12-2030 **** 0.343
**** 12-2031 **** 0.328
**** 12-2032 **** 0.313
**** 12-2033 **** 0.299
**** 12-2034 **** 0.286
**** 12-2035 **** 0.272
**** S Tot **** 5.754
**** After **** 4.628
**** Total **** 10.382
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 243.873
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 164.912
**** Revenue **** 15.00 **** 125.554
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 102.163
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 86.670
**** 30.00 **** 75.648
API:    CODE:
--- ---
PROPNUM: L8BB146D00 12 Months in first year
50.000 Year Life (01/2071)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 54 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 48

Cawley, Gillespie & Associates, Inc.

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Table 49

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— FOSTER HL & WE JONES

AIRSTRIP (BONE SPRINGS) FIELD — GREGG COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.136
**** 12-2022 **** 0.128
**** 12-2023 **** 0.120
**** 12-2024 **** 0.113
**** 12-2025 **** 0.106
**** 12-2026 **** 0.100
**** 12-2027 **** 0.093
**** 12-2028 **** 0.088
**** 12-2029 **** 0.083
**** 12-2030 **** 0.078
**** 12-2031 **** 0.073
**** 12-2032 **** 0.069
**** 12-2033 **** 0.064
**** 12-2034 **** 0.061
**** 12-2035 **** 0.057
**** S Tot **** 1.368
**** After **** 0.723
**** Total **** 2.091
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 45.644
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 32.409
**** Revenue **** 15.00 **** 25.294
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 20.890
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 17.898
**** 30.00 **** 15.733
API:    CODE:
--- ---
PROPNUM: L8BB13OE00 12 Months in first year
41.750 Year Life (10/2062)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 48 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 49

Cawley, Gillespie & Associates, Inc.

LOGO

Table 50

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— LAWRENCE HM

EAST TEXAS FIELD — GREGG COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.284
**** 12-2022 **** 0.268
**** 12-2023 **** 0.253
**** 12-2024 **** 0.239
**** 12-2025 **** 0.227
**** 12-2026 **** 0.213
**** 12-2027 **** 0.202
**** 12-2028 **** 0.191
**** 12-2029 **** 0.181
**** 12-2030 **** 0.170
**** 12-2031 **** 0.161
**** 12-2032 **** 0.152
**** 12-2033 **** 0.144
**** 12-2034 **** 0.136
**** 12-2035 **** 0.129
**** S Tot **** 2.949
**** After **** 1.647
**** Total **** 4.596
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 105.481
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 74.170
**** Revenue **** 15.00 **** 57.500
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 47.273
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 40.376
**** 30.00 **** 35.411
API:    CODE:
--- ---
PROPNUM: L8BB141D00 12 Months in first year
39.250 Year Life (04/2060)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 51 YE2020    01/29/2021    15:43:18
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 50

Cawley, Gillespie & Associates, Inc.

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Table 51

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MOORE BOSTON

EAST TEXAS FIELD — GREGG COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.048
**** 12-2022 **** 0.041
**** 12-2023 **** 0.035
**** 12-2024 **** 0.031
**** 12-2025 **** 0.027
**** 12-2026 **** 0.024
**** 12-2027 **** 0.021
**** 12-2028 **** 0.019
**** 12-2029 **** 0.018
**** 12-2030 **** 0.016
**** 12-2031 **** 0.014
**** 12-2032 **** 0.013
**** 12-2033 **** 0.012
**** 12-2034 **** 0.011
**** 12-2035 **** 0.004
**** S Tot **** 0.337
**** After **** 0.000
**** Total **** 0.337
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 9.988
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 8.192
**** Revenue **** 15.00 **** 6.944
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 6.041
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 5.363
**** 30.00 **** 4.838
API:    CODE:
--- ---
PROPNUM: L8BB140D00 12 Months in first year
14.417 Year Life (06/2035)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 50 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 51

Cawley, Gillespie & Associates, Inc.

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Table 52

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— VARIOUS EAST TEXAS PROPERTIES

EAST TEXAS & OTHERS (VARIOUS) FIELD — GREGG COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.373
**** 12-2022 **** 0.328
**** 12-2023 **** 0.291
**** 12-2024 **** 0.260
**** 12-2025 **** 0.234
**** 12-2026 **** 0.210
**** 12-2027 **** 0.189
**** 12-2028 **** 0.170
**** 12-2029 **** 0.153
**** 12-2030 **** 0.137
**** 12-2031 **** 0.124
**** 12-2032 **** 0.112
**** 12-2033 **** 0.100
**** 12-2034 **** 0.091
**** 12-2035 **** 0.081
**** S Tot **** 2.853
**** After **** 0.333
**** Total **** 3.186
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 104.375
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 82.487
**** Revenue **** 15.00 **** 68.320
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 58.541
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 51.433
**** 30.00 **** 46.049
API:    CODE:
--- ---
PROPNUM: L8BB131E00 12 Months in first year
20.750 Year Life (10/2041)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 47 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 52

Cawley, Gillespie & Associates, Inc.

LOGO

Table 53

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— DAVIS JD E GAS UNIT

WILLOW SPRINGS (VARIOUS) FIELD — GREGG COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 8.601
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 7.051
**** Revenue **** 15.00 **** 5.980
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 5.205
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 4.622
**** 30.00 **** 4.170
API:    CODE:
--- ---
PROPNUM: L8BB164D00 12 Months in first year
16.250 Year Life (04/2037)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 106 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 53

Cawley, Gillespie & Associates, Inc.

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Table 54

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— ANTON-IRISH CLEARFORK UNIT

ANTON-IRISH (CLEARFORK) FIELD — HALE COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.311
**** 12-2022 **** 1.219
**** 12-2023 **** 1.134
**** 12-2024 **** 1.054
**** 12-2025 **** 0.981
**** 12-2026 **** 0.912
**** 12-2027 **** 0.848
**** 12-2028 **** 0.789
**** 12-2029 **** 0.733
**** 12-2030 **** 0.682
**** 12-2031 **** 0.635
**** 12-2032 **** 0.591
**** 12-2033 **** 0.549
**** 12-2034 **** 0.510
**** 12-2035 **** 0.475
**** S Tot **** 12.423
**** After **** 4.413
**** Total **** 16.836
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 399.646
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 293.823
**** Revenue **** 15.00 **** 233.188
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 194.427
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 167.625
**** 30.00 **** 148.004
API:    CODE:
--- ---
PROPNUM: L8BB147D00 12 Months in first year
31.583 Year Life (07/2052)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 55 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 54

Cawley, Gillespie & Associates, Inc.

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Table 55

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— SUNDOWN UNIT

SLAUGHTER (Various) FIELD — HOCKLEY COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.487
**** 12-2022 **** 0.462
**** 12-2023 **** 0.439
**** 12-2024 **** 0.417
**** 12-2025 **** 0.397
**** 12-2026 **** 0.376
**** 12-2027 **** 0.358
**** 12-2028 **** 0.339
**** 12-2029 **** 0.323
**** 12-2030 **** 0.307
**** 12-2031 **** 0.291
**** 12-2032 **** 0.277
**** 12-2033 **** 0.263
**** 12-2034 **** 0.249
**** 12-2035 **** 0.237
**** S Tot **** 5.220
**** After **** 3.481
**** Total **** 8.701
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 179.613
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 123.961
**** Revenue **** 15.00 **** 95.252
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 77.914
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 66.326
**** 30.00 **** 58.032
API:    CODE:
--- ---
PROPNUM: L8BB149D00 12 Months in first year
43.833 Year Life (10/2064)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 56 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 55

Cawley, Gillespie & Associates, Inc.

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Table 56

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— VARIOUS TL&M A & HELEN

COAHOMA N, IATAN, SNYDER (VARIOUS) FIELD — HOWARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB14NE00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 65 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 56

Cawley, Gillespie & Associates, Inc.

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Table 57

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— CHALK DUNCAN, DORIS, OTIS, OTHER

HOWARD GLASSCOCK (VARIOUS) FIELD — HOWARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.534
**** 12-2022 **** 1.311
**** 12-2023 **** 1.121
**** 12-2024 **** 0.958
**** 12-2025 **** 0.820
**** 12-2026 **** 0.701
**** 12-2027 **** 0.599
**** 12-2028 **** 0.512
**** 12-2029 **** 0.438
**** 12-2030 **** 0.375
**** 12-2031 **** 0.320
**** 12-2032 **** 0.274
**** 12-2033 **** 0.234
**** 12-2034 **** 0.200
**** 12-2035 **** 0.045
**** S Tot **** 9.440
**** After **** 0.000
**** Total **** 9.440
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 280.930
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 235.339
**** Revenue **** 15.00 **** 202.708
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 178.454
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 159.837
**** 30.00 **** 145.153
API:    CODE:
--- ---
PROPNUM: L8BB14ED00 12 Months in first year
14.250 Year Life (04/2035)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 59 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 57

Cawley, Gillespie & Associates, Inc.

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Table 58

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— CHALK H-G GLORIETA, OTHER CHALK

HOWARD GLASSCOCK (GLORIETA) FIELD — HOWARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.262
**** 12-2022 **** 2.024
**** 12-2023 **** 1.811
**** 12-2024 **** 1.621
**** 12-2025 **** 1.451
**** 12-2026 **** 1.298
**** 12-2027 **** 1.163
**** 12-2028 **** 1.040
**** 12-2029 **** 0.931
**** 12-2030 **** 0.833
**** 12-2031 **** 0.746
**** 12-2032 **** 0.667
**** 12-2033 **** 0.598
**** 12-2034 **** 0.535
**** 12-2035 **** 0.479
**** S Tot **** 17.456
**** After **** 1.904
**** Total **** 19.360
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 530.533
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 420.573
**** Revenue **** 15.00 **** 348.968
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 299.307
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 263.082
**** 30.00 **** 235.571
API:    CODE:
--- ---
PROPNUM: L8BB14IE00 12 Months in first year
20.667 Year Life (09/2041)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 62 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 58

Cawley, Gillespie & Associates, Inc.

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Table 59

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— HYMAN-CHALK, CHALK, BOWEN

HOWARD GLASSCOCK (VARIOUS) FIELD — HOWARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.381
**** 12-2022 **** 1.201
**** 12-2023 **** 1.045
**** 12-2024 **** 0.910
**** 12-2025 **** 0.791
**** 12-2026 **** 0.688
**** 12-2027 **** 0.598
**** 12-2028 **** 0.521
**** 12-2029 **** 0.453
**** 12-2030 **** 0.394
**** 12-2031 **** 0.343
**** 12-2032 **** 0.299
**** 12-2033 **** 0.260
**** 12-2034 **** 0.226
**** 12-2035 **** 0.197
**** S Tot **** 9.307
**** After **** 0.184
**** Total **** 9.491
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 281.100
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 231.413
**** Revenue **** 15.00 **** 196.883
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 171.789
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 152.855
**** 30.00 **** 138.118
API:    CODE:
--- ---
PROPNUM: L8BB14HE00 12 Months in first year
16.083 Year Life (01/2037)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 61 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 59

Cawley, Gillespie & Associates, Inc.

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Table 60

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— OVERTON B & OVERTON B ‘A‘

HOWARD GLASSCOCK (Various) FIELD — HOWARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.739
**** 12-2022 **** 1.504
**** 12-2023 **** 1.301
**** 12-2024 **** 1.125
**** 12-2025 **** 0.973
**** 12-2026 **** 0.842
**** 12-2027 **** 0.728
**** 12-2028 **** 0.630
**** 12-2029 **** 0.545
**** 12-2030 **** 0.472
**** 12-2031 **** 0.408
**** 12-2032 **** 0.353
**** 12-2033 **** 0.305
**** 12-2034 **** 0.264
**** 12-2035 **** 0.228
**** S Tot **** 11.415
**** After **** 0.085
**** Total **** 11.501
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 334.249
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 276.871
**** Revenue **** 15.00 **** 236.576
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 207.059
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 184.656
**** 30.00 **** 167.137
API:    CODE:
--- ---
PROPNUM: L8BB14KE00 12 Months in first year
15.417 Year Life (06/2036)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 63 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 60

Cawley, Gillespie & Associates, Inc.

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Table 61

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— REED VARIOUS

HOWARD GLASSCOCK (VARIOUS) FIELD — HOWARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.745
**** 12-2022 **** 1.614
**** 12-2023 **** 1.493
**** 12-2024 **** 1.381
**** 12-2025 **** 1.278
**** 12-2026 **** 1.182
**** 12-2027 **** 1.093
**** 12-2028 **** 1.011
**** 12-2029 **** 0.935
**** 12-2030 **** 0.866
**** 12-2031 **** 0.800
**** 12-2032 **** 0.740
**** 12-2033 **** 0.685
**** 12-2034 **** 0.634
**** 12-2035 **** 0.586
**** S Tot **** 16.043
**** After **** 4.784
**** Total **** 20.827
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 512.250
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 381.999
**** Revenue **** 15.00 **** 305.483
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 255.865
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 221.258
**** 30.00 **** 195.779
API:    CODE:
--- ---
PROPNUM: L8BB14FD00 12 Months in first year
28.917 Year Life (12/2049)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 60 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 61

Cawley, Gillespie & Associates, Inc.

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Table 62

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— SETTLES W R B & SETTLES YATES UN

HOWARD GLASSCOCK (YATES, OTHERS) FIELD — HOWARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.726
**** 12-2022 **** 2.507
**** 12-2023 **** 2.307
**** 12-2024 **** 2.122
**** 12-2025 **** 1.953
**** 12-2026 **** 1.796
**** 12-2027 **** 1.653
**** 12-2028 **** 1.520
**** 12-2029 **** 1.399
**** 12-2030 **** 1.287
**** 12-2031 **** 1.184
**** 12-2032 **** 1.089
**** 12-2033 **** 1.002
**** 12-2034 **** 0.922
**** 12-2035 **** 0.848
**** S Tot **** 24.316
**** After **** 6.218
**** Total **** 30.534
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 764.469
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 576.953
**** Revenue **** 15.00 **** 464.562
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 390.771
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 338.894
**** 30.00 **** 300.496
API:    CODE:
--- ---
PROPNUM: L8BB166D00 12 Months in first year
27.167 Year Life (03/2048)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 107 YE2020    01/29/2021    15:43:19
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 62

Cawley, Gillespie & Associates, Inc.

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Table 63

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— SETTLES YATES UNIT & OTHER SETTL

HOWARD GLASSCOCK (Various) FIELD — HOWARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB14CD00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 58 YE2020    01/29/2021    15:43:20
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 63

Cawley, Gillespie & Associates, Inc.

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Table 64

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— TL&M A-R/A-A

IATAN EAST HOWARD (Various) FIELD — HOWARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.121
**** 12-2022 **** 0.110
**** 12-2023 **** 0.100
**** 12-2024 **** 0.091
**** 12-2025 **** 0.083
**** 12-2026 **** 0.076
**** 12-2027 **** 0.069
**** 12-2028 **** 0.063
**** 12-2029 **** 0.057
**** 12-2030 **** 0.052
**** 12-2031 **** 0.047
**** 12-2032 **** 0.043
**** 12-2033 **** 0.039
**** 12-2034 **** 0.035
**** 12-2035 **** 0.033
**** S Tot **** 1.018
**** After **** 0.215
**** Total **** 1.233
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 39.699
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 30.454
**** Revenue **** 15.00 **** 24.785
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 21.001
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 18.309
**** 30.00 **** 16.298
API:    CODE:
--- ---
PROPNUM: L8BB14PE00 12 Months in first year
26.417 Year Life (06/2047)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 66 YE2020    01/29/2021    15:43:20
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 64

Cawley, Gillespie & Associates, Inc.

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Table 65

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— O‘DANIEL A E, O‘DANIEL B & O‘DAN

SNYDER (Various) FIELD — HOWARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.306
**** 12-2022 **** 0.277
**** 12-2023 **** 0.250
**** 12-2024 **** 0.227
**** 12-2025 **** 0.205
**** 12-2026 **** 0.185
**** 12-2027 **** 0.167
**** 12-2028 **** 0.152
**** 12-2029 **** 0.137
**** 12-2030 **** 0.124
**** 12-2031 **** 0.113
**** 12-2032 **** 0.102
**** 12-2033 **** 0.093
**** 12-2034 **** 0.084
**** 12-2035 **** 0.076
**** S Tot **** 2.498
**** After **** 0.404
**** Total **** 2.901
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 76.307
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 59.367
**** Revenue **** 15.00 **** 48.689
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 41.444
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 36.237
**** 30.00 **** 32.323
API:    CODE:
--- ---
PROPNUM: L8BB167D00 12 Months in first year
23.250 Year Life (04/2044)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 108 YE2020    01/29/2021    15:43:20
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 65

Cawley, Gillespie & Associates, Inc.

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Table 66

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— EAST VEALMOOR UNIT

VEALMOOR EAST (CANYON REEF) FIELD — HOWARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.055
**** 12-2022 **** 0.051
**** 12-2023 **** 0.048
**** 12-2024 **** 0.044
**** 12-2025 **** 0.041
**** 12-2026 **** 0.038
**** 12-2027 **** 0.035
**** 12-2028 **** 0.033
**** 12-2029 **** 0.031
**** 12-2030 **** 0.028
**** 12-2031 **** 0.026
**** 12-2032 **** 0.025
**** 12-2033 **** 0.023
**** 12-2034 **** 0.021
**** 12-2035 **** 0.019
**** S Tot **** 0.517
**** After **** 0.117
**** Total **** 0.635
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 18.416
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 13.874
**** Revenue **** 15.00 **** 11.117
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 9.303
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 8.032
**** 30.00 **** 7.096
API:    CODE:
--- ---
PROPNUM: L8BB14LE00 12 Months in first year
23.167 Year Life (03/2044)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 64 YE2020    01/29/2021    15:43:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 66

Cawley, Gillespie & Associates, Inc.

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Table 67

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— JOHNSON G (TRUST) SA OIL

PANHANDLE FIELD — HUTCHINSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB169D00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 109 YE2020    01/29/2021    15:43:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 67

Cawley, Gillespie & Associates, Inc.

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Table 68

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— TURNER-KENT B & VARIOUS COCKRELL

PANHANDLE & ADOBE WALL FIELD — HUTCHINSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.115
**** 12-2022 **** 0.086
**** 12-2023 **** 0.065
**** 12-2024 **** 0.048
**** 12-2025 **** 0.036
**** 12-2026 **** 0.027
**** 12-2027 **** 0.020
**** 12-2028 **** 0.015
**** 12-2029 **** 0.010
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.424
**** After **** 0.000
**** Total **** 0.424
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 13.639
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 12.200
**** Revenue **** 15.00 **** 11.056
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 10.129
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 9.364
**** 30.00 **** 8.725
API:    CODE:
--- ---
PROPNUM: L8BB14VE00 12 Months in first year
8.833 Year Life (10/2029)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 70 YE2020    01/29/2021    15:43:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 68

Cawley, Gillespie & Associates, Inc.

LOGO

Table 69

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— ANTELOPE CREEK, JOHNSON EB A&C

PANHANDLE HUTCHINSON COUNTY FIELD — HUTCHINSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 12.710
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 10.164
**** Revenue **** 15.00 **** 8.481
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 7.301
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 6.434
**** 30.00 **** 5.772
API:    CODE:
--- ---
PROPNUM: L8BB14QE00 12 Months in first year
19.500 Year Life (07/2040)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 67 YE2020    01/29/2021    15:43:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 69

Cawley, Gillespie & Associates, Inc.

LOGO

Table 70

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— HUTCHINSON COUNTY PROPERTIES

PANHANDLE HUTCHINSON COUNTY FIELD — HUTCHINSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.027
**** 12-2022 **** 0.024
**** 12-2023 **** 0.020
**** 12-2024 **** 0.017
**** 12-2025 **** 0.014
**** 12-2026 **** 0.012
**** 12-2027 **** 0.005
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.120
**** After **** 0.000
**** Total **** 0.120
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
After .0
Total .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 3.874
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 3.456
**** Revenue **** 15.00 **** 3.118
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 2.841
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 2.611
**** 30.00 **** 2.417
API:    CODE:
--- ---
PROPNUM: L8BB17AD00 12 Months in first year
6.500 Year Life (07/2027)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 136 YE2020    01/29/2021    15:43:21
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 70

Cawley, Gillespie & Associates, Inc.

LOGO

Table 71

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— JOHNSON, JOHNSON RANCH & OTHERS

PANHANDLE HUTCHINSON COUNTY (VARIOUS) FIELD — HUTCHINSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.596
**** 12-2022 **** 0.530
**** 12-2023 **** 0.472
**** 12-2024 **** 0.420
**** 12-2025 **** 0.374
**** 12-2026 **** 0.332
**** 12-2027 **** 0.296
**** 12-2028 **** 0.264
**** 12-2029 **** 0.234
**** 12-2030 **** 0.209
**** 12-2031 **** 0.186
**** 12-2032 **** 0.166
**** 12-2033 **** 0.147
**** 12-2034 **** 0.131
**** 12-2035 **** 0.116
**** S Tot **** 4.472
**** After **** 0.379
**** Total **** 4.851
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 281.657
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 225.302
**** Revenue **** 15.00 **** 188.015
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 161.869
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 142.651
**** 30.00 **** 127.977
API:    CODE:
--- ---
PROPNUM: L8BB14SE00 12 Months in first year
19.417 Year Life (06/2040)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 68 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 71

Cawley, Gillespie & Associates, Inc.

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Table 72

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— JON & JON A1, B1 & C

PANHANDLE HUTCHINSON COUNTY (VARIOUS) FIELD — HUTCHINSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB129D00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 19 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 72

Cawley, Gillespie & Associates, Inc.

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Table 73

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— PANHANDLE HUTCHINSON COUNTY VARI

PANHANDLE HUTCHINSON COUNTY (VARIOUS) FIELD — HUTCHINSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.242
**** 12-2022 **** 0.223
**** 12-2023 **** 0.205
**** 12-2024 **** 0.189
**** 12-2025 **** 0.174
**** 12-2026 **** 0.160
**** 12-2027 **** 0.147
**** 12-2028 **** 0.135
**** 12-2029 **** 0.124
**** 12-2030 **** 0.115
**** 12-2031 **** 0.105
**** 12-2032 **** 0.097
**** 12-2033 **** 0.089
**** 12-2034 **** 0.082
**** 12-2035 **** 0.076
**** S Tot **** 2.162
**** After **** 0.555
**** Total **** 2.717
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 360.218
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 271.807
**** Revenue **** 15.00 **** 218.843
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 184.077
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 159.638
**** 30.00 **** 141.550
API:    CODE:
--- ---
PROPNUM: L8BB14TE00 12 Months in first year
27.250 Year Life (04/2048)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 69 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 73

Cawley, Gillespie & Associates, Inc.

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Table 74

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— VARIOUS COCKRELL PROPERTIES

PANHANDLE HUTCHINSON COUNTY (VARIOUS) FIELD — HUTCHINSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.345
**** 12-2022 **** 0.312
**** 12-2023 **** 0.282
**** 12-2024 **** 0.256
**** 12-2025 **** 0.231
**** 12-2026 **** 0.209
**** 12-2027 **** 0.190
**** 12-2028 **** 0.171
**** 12-2029 **** 0.155
**** 12-2030 **** 0.140
**** 12-2031 **** 0.127
**** 12-2032 **** 0.115
**** 12-2033 **** 0.104
**** 12-2034 **** 0.094
**** 12-2035 **** 0.085
**** S Tot **** 2.815
**** After **** 0.391
**** Total **** 3.206
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 94.184
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 73.646
**** Revenue **** 15.00 **** 60.538
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 51.583
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 45.122
**** 30.00 **** 40.257
API:    CODE:
--- ---
PROPNUM: L8BB14WE00 12 Months in first year
21.583 Year Life (07/2042)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 71 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 74

Cawley, Gillespie & Associates, Inc.

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Table 75

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

VARIOUS — MAYER 1R & GERRY 1 - SUMMARY

PANHANDLE WEST (BROWN DOLOMITE) FIELD — HUTCHINSON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 2.228
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 1.844
**** Revenue **** 15.00 **** 1.576
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 1.380
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 1.232
**** 30.00 **** 1.116
API: 42233330480000    CODE: 242,
--- ---
PROPNUM: L8BB179D00 12 Months in first year
16.583 Year Life (07/2037)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 135 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 75

Cawley, Gillespie & Associates, Inc.

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Table 76

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— COLEMAN RANCH UNIT

COLEMAN RANCH (Various) FIELD — MITCHELL COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.790
**** 12-2022 **** 0.718
**** 12-2023 **** 0.654
**** 12-2024 **** 0.595
**** 12-2025 **** 0.542
**** 12-2026 **** 0.493
**** 12-2027 **** 0.449
**** 12-2028 **** 0.408
**** 12-2029 **** 0.371
**** 12-2030 **** 0.338
**** 12-2031 **** 0.308
**** 12-2032 **** 0.280
**** 12-2033 **** 0.255
**** 12-2034 **** 0.232
**** 12-2035 **** 0.211
**** S Tot **** 6.642
**** After **** 1.241
**** Total **** 7.883
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 204.393
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 157.598
**** Revenue **** 15.00 **** 128.526
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 108.992
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 95.049
**** 30.00 **** 84.620
API:    CODE:
--- ---
PROPNUM: L8BB14OE00 12 Months in first year
24.250 Year Life (04/2045)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 74 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 76

Cawley, Gillespie & Associates, Inc.

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Table 77

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— BURCHARD, COLEMAN VARIOUS, COX,

COLEMAN RANCH, WESTBROOK (Various) FIELD — MITCHELL COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.351
**** 12-2022 **** 0.319
**** 12-2023 **** 0.290
**** 12-2024 **** 0.264
**** 12-2025 **** 0.241
**** 12-2026 **** 0.219
**** 12-2027 **** 0.199
**** 12-2028 **** 0.182
**** 12-2029 **** 0.165
**** 12-2030 **** 0.150
**** 12-2031 **** 0.137
**** 12-2032 **** 0.124
**** 12-2033 **** 0.113
**** 12-2034 **** 0.103
**** 12-2035 **** 0.093
**** S Tot **** 2.949
**** After **** 0.502
**** Total **** 3.451
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 90.147
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 69.758
**** Revenue **** 15.00 **** 56.978
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 48.350
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 42.177
**** 30.00 **** 37.554
API:    CODE:
--- ---
PROPNUM: L8BB16AD00 12 Months in first year
23.000 Year Life (01/2044)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 110 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 77

Cawley, Gillespie & Associates, Inc.

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Table 78

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— FOSTER MARY

IATAN & IATAN EAST HOWARD (SADR & CLEARFORK) FIELD — MITCHELL COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.657
**** 12-2022 **** 0.611
**** 12-2023 **** 0.568
**** 12-2024 **** 0.528
**** 12-2025 **** 0.491
**** 12-2026 **** 0.457
**** 12-2027 **** 0.425
**** 12-2028 **** 0.395
**** 12-2029 **** 0.368
**** 12-2030 **** 0.342
**** 12-2031 **** 0.318
**** 12-2032 **** 0.295
**** 12-2033 **** 0.275
**** 12-2034 **** 0.256
**** 12-2035 **** 0.238
**** S Tot **** 6.222
**** After **** 2.139
**** Total **** 8.361
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 199.581
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 147.019
**** Revenue **** 15.00 **** 116.752
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 97.364
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 83.948
**** 30.00 **** 74.123
API:    CODE:
--- ---
PROPNUM: L8BB151D00 12 Months in first year
30.583 Year Life (07/2051)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 77 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 78

Cawley, Gillespie & Associates, Inc.

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Table 79

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— WATSON WWD & WW

IATAN EAST HOWARD (CLEARFORK) FIELD — MITCHELL COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.200
**** 12-2022 **** 0.187
**** 12-2023 **** 0.175
**** 12-2024 **** 0.164
**** 12-2025 **** 0.153
**** 12-2026 **** 0.143
**** 12-2027 **** 0.134
**** 12-2028 **** 0.125
**** 12-2029 **** 0.117
**** 12-2030 **** 0.109
**** 12-2031 **** 0.102
**** 12-2032 **** 0.095
**** 12-2033 **** 0.089
**** 12-2034 **** 0.084
**** 12-2035 **** 0.078
**** S Tot **** 1.957
**** After **** 0.810
**** Total **** 2.767
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 63.807
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 46.257
**** Revenue **** 15.00 **** 36.435
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 30.241
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 25.993
**** 30.00 **** 22.901
API:    CODE:
--- ---
PROPNUM: L8BB150D00 12 Months in first year
34.000 Year Life (01/2055)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 76 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 79

Cawley, Gillespie & Associates, Inc.

LOGO

Table 80

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MCCABE VT VARIOUS, STUBBLEFIELD

JAMESON NORTH (STRAWN & OTHERS) FIELD — MITCHELL COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.013
**** 12-2022 **** 0.011
**** 12-2023 **** 0.005
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.030
**** After **** 0.000
**** Total **** 0.030
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 1.055
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 1.000
**** Revenue **** 15.00 **** 0.951
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 0.907
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 0.868
**** 30.00 **** 0.833
API:    CODE:
--- ---
PROPNUM: L8BB141E00 12 Months in first year
2.500 Year Life (07/2023)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 73 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 80

Cawley, Gillespie & Associates, Inc.

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Table 81

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— NORTH WESTBROOK UNIT

WESTBROOK (CLEARFORK) FIELD — MITCHELL COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.839
**** 12-2022 **** 0.747
**** 12-2023 **** 0.665
**** 12-2024 **** 0.591
**** 12-2025 **** 0.526
**** 12-2026 **** 0.469
**** 12-2027 **** 0.417
**** 12-2028 **** 0.371
**** 12-2029 **** 0.331
**** 12-2030 **** 0.294
**** 12-2031 **** 0.262
**** 12-2032 **** 0.233
**** 12-2033 **** 0.207
**** 12-2034 **** 0.184
**** 12-2035 **** 0.164
**** S Tot **** 6.300
**** After **** 0.519
**** Total **** 6.819
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 188.024
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 150.491
**** Revenue **** 15.00 **** 125.622
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 108.168
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 95.333
**** 30.00 **** 85.530
API:    CODE:
--- ---
PROPNUM: L8BB140E00 12 Months in first year
19.250 Year Life (04/2040)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 72 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 81

Cawley, Gillespie & Associates, Inc.

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Table 82

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— CONROE FIELD UNIT

CONROE FIELD — MONTGOMERY COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.467
**** 12-2022 **** 0.446
**** 12-2023 **** 0.426
**** 12-2024 **** 0.407
**** 12-2025 **** 0.389
**** 12-2026 **** 0.371
**** 12-2027 **** 0.354
**** 12-2028 **** 0.338
**** 12-2029 **** 0.323
**** 12-2030 **** 0.308
**** 12-2031 **** 0.295
**** 12-2032 **** 0.281
**** 12-2033 **** 0.269
**** 12-2034 **** 0.256
**** 12-2035 **** 0.245
**** S Tot **** 5.177
**** After **** 4.057
**** Total **** 9.234
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 197.634
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 133.872
**** Revenue **** 15.00 **** 101.948
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 82.958
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 70.378
**** 30.00 **** 61.428
API:    CODE:
--- ---
PROPNUM: L8BB153D00 12 Months in first year
47.833 Year Life (10/2068)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 78 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 82

Cawley, Gillespie & Associates, Inc.

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Table 83

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— VARIOUS MCCANN PROPERTIES

ARNOLD-DAVIS & LUBY (VARIOUS) FIELD — NUECES COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB154D00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 79 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 83

Cawley, Gillespie & Associates, Inc.

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Table 84

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— WOODWARD 64 & SOUTHLAND ROYALTY

CHENOT (WOLFCAMP) FIELD — PECOS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.049
**** 12-2022 **** 0.042
**** 12-2023 **** 0.037
**** 12-2024 **** 0.032
**** 12-2025 **** 0.027
**** 12-2026 **** 0.023
**** 12-2027 **** 0.020
**** 12-2028 **** 0.018
**** 12-2029 **** 0.015
**** 12-2030 **** 0.012
**** 12-2031 **** 0.011
**** 12-2032 **** 0.010
**** 12-2033 **** 0.008
**** 12-2034 **** 0.007
**** 12-2035 **** 0.005
**** S Tot **** 0.316
**** After **** 0.000
**** Total **** 0.316
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 32.735
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 27.270
**** Revenue **** 15.00 **** 23.396
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 20.537
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 18.355
**** 30.00 **** 16.641
API:    CODE:
--- ---
PROPNUM: L8BB157D00 12 Months in first year
14.833 Year Life (10/2035)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 81 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 84

Cawley, Gillespie & Associates, Inc.

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Table 85

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— YATES FIELD UNIT & SMITH MYRON

YATES (VARIOUS) FIELD — PECOS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 18.298
**** 12-2022 **** 17.658
**** 12-2023 **** 17.040
**** 12-2024 **** 16.444
**** 12-2025 **** 15.868
**** 12-2026 **** 15.313
**** 12-2027 **** 14.777
**** 12-2028 **** 14.260
**** 12-2029 **** 13.761
**** 12-2030 **** 13.279
**** 12-2031 **** 12.814
**** 12-2032 **** 12.366
**** 12-2033 **** 11.933
**** 12-2034 **** 11.515
**** 12-2035 **** 11.112
**** S Tot **** 216.436
**** After **** 218.329
**** Total **** 434.766
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 7,929.618
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 5,181.084
**** Revenue **** 15.00 **** 3,872.897
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 3,117.033
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 2,625.338
**** 30.00 **** 2,279.790
API:    CODE:
--- ---
PROPNUM: L8BB156D00 12 Months in first year
50.000 Year Life (01/2071)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 80 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 85

Cawley, Gillespie & Associates, Inc.

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Table 86

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— CONOCO YATES, YATES IG, OTHER YA

YATES , TOBORG (WOLFCAMP, OTHERS) FIELD — PECOS COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.114
**** 12-2022 **** 0.108
**** 12-2023 **** 0.100
**** 12-2024 **** 0.094
**** 12-2025 **** 0.089
**** 12-2026 **** 0.084
**** 12-2027 **** 0.078
**** 12-2028 **** 0.074
**** 12-2029 **** 0.070
**** 12-2030 **** 0.065
**** 12-2031 **** 0.062
**** 12-2032 **** 0.058
**** 12-2033 **** 0.055
**** 12-2034 **** 0.051
**** 12-2035 **** 0.048
**** S Tot **** 1.149
**** After **** 0.581
**** Total **** 1.730
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 38.249
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 27.234
**** Revenue **** 15.00 **** 21.268
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 17.567
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 15.052
**** 30.00 **** 13.231
ASN=111 PDP
--- ---
API:    CODE: 12 Months in first year
39.000 Year Life (01/2060)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 111 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 86

Cawley, Gillespie & Associates, Inc.

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Table 87

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— LOFTIN & GOULD A

SPRABERRY (TREND AREA) FIELD — REAGAN COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.037
**** 12-2022 **** 0.907
**** 12-2023 **** 0.804
**** 12-2024 **** 0.722
**** 12-2025 **** 0.653
**** 12-2026 **** 0.597
**** 12-2027 **** 0.548
**** 12-2028 **** 0.507
**** 12-2029 **** 0.471
**** 12-2030 **** 0.439
**** 12-2031 **** 0.412
**** 12-2032 **** 0.387
**** 12-2033 **** 0.365
**** 12-2034 **** 0.345
**** 12-2035 **** 0.327
**** S Tot **** 8.520
**** After **** 3.950
**** Total **** 12.470
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 481.549
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 351.005
**** Revenue **** 15.00 **** 279.293
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 234.328
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 203.451
**** 30.00 **** 180.863
API:    CODE:
--- ---
PROPNUM: L8BB15CD00 12 Months in first year
34.667 Year Life (09/2055)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 84 YE2020    01/29/2021    15:43:22
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 87

Cawley, Gillespie & Associates, Inc.

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Table 88

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— PP BOYLES

DIAMOND -M- (CLEARFORK) FIELD — SCURRY COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.060
**** 12-2022 **** 0.056
**** 12-2023 **** 0.051
**** 12-2024 **** 0.047
**** 12-2025 **** 0.043
**** 12-2026 **** 0.040
**** 12-2027 **** 0.036
**** 12-2028 **** 0.033
**** 12-2029 **** 0.031
**** 12-2030 **** 0.028
**** 12-2031 **** 0.026
**** 12-2032 **** 0.024
**** 12-2033 **** 0.022
**** 12-2034 **** 0.020
**** 12-2035 **** 0.019
**** S Tot **** 0.536
**** After **** 0.088
**** Total **** 0.624
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 16.570
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 12.745
**** Revenue **** 15.00 **** 10.348
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 8.735
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 7.587
**** 30.00 **** 6.732
API:    CODE:
--- ---
PROPNUM: L8BB16ED00 12 Months in first year
21.333 Year Life (04/2042)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 112 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 88

Cawley, Gillespie & Associates, Inc.

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Table 89

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— JAP BECK LEASE

KELLY-SNYDER (CISCO) FIELD — SCURRY COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.019
**** 12-2022 **** 0.015
**** 12-2023 **** 0.013
**** 12-2024 **** 0.007
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.054
**** After **** 0.000
**** Total **** 0.054
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 1.823
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 1.695
**** Revenue **** 15.00 **** 1.585
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 1.489
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 1.405
**** 30.00 **** 1.331
API:    CODE:
--- ---
PROPNUM: NEWYE13138 12 Months in first year
3.667 Year Life (09/2024)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 138 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 89

Cawley, Gillespie & Associates, Inc.

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Table 90

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— SACROC, BROWN JW & REVILO GLORIE

KELLY-SNYDER & REVILO (VARIOUS) FIELD — SCURRY COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 25.112
**** 12-2022 **** 22.962
**** 12-2023 **** 20.895
**** 12-2024 **** 19.015
**** 12-2025 **** 17.304
**** 12-2026 **** 15.746
**** 12-2027 **** 14.329
**** 12-2028 **** 13.040
**** 12-2029 **** 11.866
**** 12-2030 **** 10.798
**** 12-2031 **** 9.826
**** 12-2032 **** 8.942
**** 12-2033 **** 8.137
**** 12-2034 **** 7.405
**** 12-2035 **** 6.738
**** S Tot **** 212.117
**** After **** 40.967
**** Total **** 253.084
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 6,546.351
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 5,040.068
**** Revenue **** 15.00 **** 4,107.297
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 3,481.648
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 3,035.433
**** 30.00 **** 2,701.825
API: CODE:
--- ---
PROPNUM: L8BB15ED00 12 Months in first year
24.750 Year Life (10/2045)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 85 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 90

Cawley, Gillespie & Associates, Inc.

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Table 91

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— BOYLES G D (TRUST)

REVILO (GLORIETA) FIELD — SCURRY COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.048
**** 12-2022 **** 0.043
**** 12-2023 **** 0.039
**** 12-2024 **** 0.034
**** 12-2025 **** 0.031
**** 12-2026 **** 0.028
**** 12-2027 **** 0.026
**** 12-2028 **** 0.023
**** 12-2029 **** 0.020
**** 12-2030 **** 0.019
**** 12-2031 **** 0.017
**** 12-2032 **** 0.015
**** 12-2033 **** 0.013
**** 12-2034 **** 0.012
**** 12-2035 **** 0.009
**** S Tot **** 0.376
**** After **** 0.000
**** Total **** 0.376
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 10.677
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 8.664
**** Revenue **** 15.00 **** 7.277
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 6.279
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 5.534
**** 30.00 **** 4.961
API:    CODE:
--- ---
PROPNUM: L8BB16HE00 12 Months in first year
14.833 Year Life (10/2035)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 114 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 91

Cawley, Gillespie & Associates, Inc.

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Table 92

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— BOYD CONGLOMERATE UNIT

BOYD S E (CONGLOMERATE) FIELD — STONEWALL COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.015
**** 12-2022 **** 0.014
**** 12-2023 **** 0.012
**** 12-2024 **** 0.011
**** 12-2025 **** 0.004
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.056
**** After **** 0.000
**** Total **** 0.056
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 1.867
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 1.709
**** Revenue **** 15.00 **** 1.575
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 1.460
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 1.361
**** 30.00 **** 1.276
API:    CODE:
--- ---
PROPNUM: L8BB15HE00 12 Months in first year
4.333 Year Life (04/2025)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 87 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 92

Cawley, Gillespie & Associates, Inc.

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Table 93

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— ADAIR SAN ANDRES & WOLFCAMP UNIT

ADAIR (SAN ANDRES, WOLFCAMP) FIELD — TERRY COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 1.960
**** 12-2022 **** 1.862
**** 12-2023 **** 1.769
**** 12-2024 **** 1.681
**** 12-2025 **** 1.597
**** 12-2026 **** 1.517
**** 12-2027 **** 1.441
**** 12-2028 **** 1.369
**** 12-2029 **** 1.301
**** 12-2030 **** 1.236
**** 12-2031 **** 1.174
**** 12-2032 **** 1.115
**** 12-2033 **** 1.059
**** 12-2034 **** 1.007
**** 12-2035 **** 0.956
**** S Tot **** 21.043
**** After **** 14.248
**** Total **** 35.292
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 724.701
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 499.631
**** Revenue **** 15.00 **** 383.841
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 313.962
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 267.265
**** 30.00 **** 233.845
API:    CODE:
--- ---
PROPNUM: L8BB15IE00 12 Months in first year
44.917 Year Life (12/2065)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 88 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 93

Cawley, Gillespie & Associates, Inc.

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Table 94

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— BLAND & FREE PROPERTIES

EAST TEXAS (VARIOUS) FIELD — UPSHUR COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.157
**** 12-2022 **** 0.144
**** 12-2023 **** 0.131
**** 12-2024 **** 0.121
**** 12-2025 **** 0.110
**** 12-2026 **** 0.100
**** 12-2027 **** 0.093
**** 12-2028 **** 0.085
**** 12-2029 **** 0.078
**** 12-2030 **** 0.071
**** 12-2031 **** 0.064
**** 12-2032 **** 0.059
**** 12-2033 **** 0.054
**** 12-2034 **** 0.049
**** 12-2035 **** 0.045
**** S Tot **** 1.360
**** After **** 0.252
**** Total **** 1.612
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 62.404
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 47.962
**** Revenue **** 15.00 **** 38.989
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 32.973
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 28.691
**** 30.00 **** 25.498
API:    CODE:
--- ---
PROPNUM: L8BB15KE00 12 Months in first year
23.167 Year Life (03/2044)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 89 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 94

Cawley, Gillespie & Associates, Inc.

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Table 95

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— EDWARDS, EDWARDS ETHEL, EDWARDS

EAST TEXAS FIELD — UPSHUR COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.187
**** 12-2022 **** 0.164
**** 12-2023 **** 0.143
**** 12-2024 **** 0.125
**** 12-2025 **** 0.109
**** 12-2026 **** 0.096
**** 12-2027 **** 0.084
**** 12-2028 **** 0.073
**** 12-2029 **** 0.064
**** 12-2030 **** 0.056
**** 12-2031 **** 0.049
**** 12-2032 **** 0.043
**** 12-2033 **** 0.038
**** 12-2034 **** 0.033
**** 12-2035 **** 0.029
**** S Tot **** 1.294
**** After **** 0.049
**** Total **** 1.343
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 53.657
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 43.838
**** Revenue **** 15.00 **** 37.107
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 32.264
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 28.636
**** 30.00 **** 25.828
API:    CODE:
--- ---
PROPNUM: L8BB16KE00 12 Months in first year
17.083 Year Life (01/2038)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 116 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 95

Cawley, Gillespie & Associates, Inc.

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Table 96

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— HAMPTON HOWARD (TRUST) 1

WHITE OAK (COTTON VALLEY) FIELD — UPSHUR COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.100
**** 12-2022 **** 0.094
**** 12-2023 **** 0.089
**** 12-2024 **** 0.085
**** 12-2025 **** 0.080
**** 12-2026 **** 0.076
**** 12-2027 **** 0.071
**** 12-2028 **** 0.067
**** 12-2029 **** 0.063
**** 12-2030 **** 0.060
**** 12-2031 **** 0.057
**** 12-2032 **** 0.054
**** 12-2033 **** 0.051
**** 12-2034 **** 0.048
**** 12-2035 **** 0.045
**** S Tot **** 1.041
**** After **** 0.592
**** Total **** 1.633
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 67.093
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 47.118
**** Revenue **** 15.00 **** 36.517
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 30.020
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 25.640
**** 30.00 **** 22.487
API:    CODE:
--- ---
PROPNUM: L8BB16LE00 12 Months in first year
40.250 Year Life (04/2061)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 117 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 96

Cawley, Gillespie & Associates, Inc.

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Table 97

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— ADAMC BEND UNIT

ADAMC (BEND) FIELD — UPTON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.426
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.395
**** Revenue **** 15.00 **** 0.368
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 0.346
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 0.326
**** 30.00 **** 0.309
API:    CODE:
--- ---
PROPNUM: L8BB15LE00 12 Months in first year
4.750 Year Life (10/2025)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 90 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 97

Cawley, Gillespie & Associates, Inc.

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Table 98

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— CRIER MCELROY (TRUST)

MCELROY FIELD — UPTON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 11.221
**** 12-2022 **** 10.659
**** 12-2023 **** 10.126
**** 12-2024 **** 9.620
**** 12-2025 **** 9.139
**** 12-2026 **** 8.682
**** 12-2027 **** 8.248
**** 12-2028 **** 7.835
**** 12-2029 **** 7.444
**** 12-2030 **** 7.072
**** 12-2031 **** 6.718
**** 12-2032 **** 6.382
**** 12-2033 **** 6.063
**** 12-2034 **** 5.760
**** 12-2035 **** 5.472
**** S Tot **** 120.440
**** After **** 81.168
**** Total **** 201.608
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 4,186.692
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 2,887.352
**** Revenue **** 15.00 **** 2,218.339
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 1,814.507
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 1,544.634
**** 30.00 **** 1,351.486
API:    CODE:
--- ---
PROPNUM: L8BB16NE00 12 Months in first year
44.583 Year Life (07/2065)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 118 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 98

Cawley, Gillespie & Associates, Inc.

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Table 99

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MCCLINTIC (TRUST) 1

MCELROY FIELD — UPTON COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB16PE00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 119 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 99

Cawley, Gillespie & Associates, Inc.

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Table 100

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— JARMAN WT, MORRIS WE, MURPHREE,

VAN FIELD — VAN ZANDT COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.133
**** 12-2022 **** 0.123
**** 12-2023 **** 0.115
**** 12-2024 **** 0.107
**** 12-2025 **** 0.100
**** 12-2026 **** 0.093
**** 12-2027 **** 0.086
**** 12-2028 **** 0.080
**** 12-2029 **** 0.074
**** 12-2030 **** 0.069
**** 12-2031 **** 0.064
**** 12-2032 **** 0.060
**** 12-2033 **** 0.056
**** 12-2034 **** 0.052
**** 12-2035 **** 0.048
**** S Tot **** 1.259
**** After **** 0.494
**** Total **** 1.753
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 42.286
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 30.909
**** Revenue **** 15.00 **** 24.489
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 20.408
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 17.593
**** 30.00 **** 15.533
API:    CODE:
--- ---
PROPNUM: L8BB16SE00 12 Months in first year
35.417 Year Life (06/2056)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 121 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 100

Cawley, Gillespie & Associates, Inc.

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Table 101

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— S V RUC UNIT

VAN (RODESSA) FIELD — VAN ZANDT COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.021
**** 12-2022 **** 0.019
**** 12-2023 **** 0.018
**** 12-2024 **** 0.016
**** 12-2025 **** 0.014
**** 12-2026 **** 0.013
**** 12-2027 **** 0.011
**** 12-2028 **** 0.006
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.119
**** After **** 0.000
**** Total **** 0.119
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 3.793
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 3.302
**** Revenue **** 15.00 **** 2.918
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 2.612
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 2.364
**** 30.00 **** 2.160
API: CODE:
--- ---
PROPNUM: L8BB16WE00 12 Months in first year
7.583 Year Life (07/2028)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 124 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 101

Cawley, Gillespie & Associates, Inc.

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Table 102

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— WELLS R L 46 (TRUST)

VAN FIELD — VAN ZANDT COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API: CODE:
--- ---
PROPNUM: L8BB16VE00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 123 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 102

Cawley, Gillespie & Associates, Inc.

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Table 103

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— CENTRAL VAN WOODBINE UNIT & OTHE

VAN & VAN SW FIELD — VAN ZANDT COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.621
**** 12-2022 **** 0.562
**** 12-2023 **** 0.509
**** 12-2024 **** 0.460
**** 12-2025 **** 0.417
**** 12-2026 **** 0.377
**** 12-2027 **** 0.341
**** 12-2028 **** 0.308
**** 12-2029 **** 0.279
**** 12-2030 **** 0.253
**** 12-2031 **** 0.229
**** 12-2032 **** 0.207
**** 12-2033 **** 0.188
**** 12-2034 **** 0.170
**** 12-2035 **** 0.153
**** S Tot **** 5.076
**** After **** 0.831
**** Total **** 5.907
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 162.360
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 126.260
**** Revenue **** 15.00 **** 103.530
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 88.117
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 77.042
**** 30.00 **** 68.720
API:    CODE:
--- ---
PROPNUM: L8BB15NE00 12 Months in first year
23.417 Year Life (06/2044)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 91 YE2020    01/29/2021    15:43:23
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 103

Cawley, Gillespie & Associates, Inc.

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Table 104

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— CONSOLIDATED & KATY GAS FIELD UN

KATY FIELD — WALLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB15PE00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 92 YE2020    01/29/2021    15:43:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 104

Cawley, Gillespie & Associates, Inc.

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Table 105

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— EDWARDS FEE ETAL & EDWARDS B 1

JANELLE SE (TUBB) FIELD — WARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.913
**** 12-2022 **** 0.827
**** 12-2023 **** 0.748
**** 12-2024 **** 0.677
**** 12-2025 **** 0.613
**** 12-2026 **** 0.554
**** 12-2027 **** 0.501
**** 12-2028 **** 0.454
**** 12-2029 **** 0.411
**** 12-2030 **** 0.372
**** 12-2031 **** 0.337
**** 12-2032 **** 0.305
**** 12-2033 **** 0.276
**** 12-2034 **** 0.249
**** 12-2035 **** 0.226
**** S Tot **** 7.463
**** After **** 1.175
**** Total **** 8.637
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 319.464
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 248.776
**** Revenue **** 15.00 **** 204.114
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 173.771
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 151.949
**** 30.00 **** 135.543
API:    CODE:
--- ---
PROPNUM: L8BB160E00 12 Months in first year
22.917 Year Life (12/2043)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 125 YE2020    01/29/2021    15:43:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 105

Cawley, Gillespie & Associates, Inc.

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Table 106

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— VARIOUS MARTIN PROPERTIES

WARD-ESTES, WARD-ESTES NORTH (Various) FIELD — WARD COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End Gross OilProduction Gross GasProduction Net OilProduction Net GasSales Avg OilPrice Avg GasPrice Oil<br>Revenue Gas<br>Revenue TotalRevenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.122
**** 12-2022 **** 0.109
**** 12-2023 **** 0.099
**** 12-2024 **** 0.089
**** 12-2025 **** 0.080
**** 12-2026 **** 0.071
**** 12-2027 **** 0.064
**** 12-2028 **** 0.058
**** 12-2029 **** 0.052
**** 12-2030 **** 0.047
**** 12-2031 **** 0.042
**** 12-2032 **** 0.038
**** 12-2033 **** 0.034
**** 12-2034 **** 0.031
**** 12-2035 **** 0.028
**** S Tot **** 0.965
**** After **** 0.128
**** Total **** 1.093
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End Production<br>Taxes Ad Valorem<br>Taxes Wells Operating<br>Expense Other<br>Deductions Investment Future Net<br>Cash Flow Cumulative<br>Cash Flow Cum.Cash Flow<br>Disc.@ 10.0%
Net
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 78.436
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 61.643
**** Revenue **** 15.00 **** 50.867
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 43.469
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 38.110
**** 30.00 **** 34.060
API:    CODE:
--- ---
PROPNUM: L8BB15QE00 12 Months in first year
21.750 Year Life (10/2042)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 93 YE2020    01/29/2021    15:43:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 106

Cawley, Gillespie & Associates, Inc.

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Table 107

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

CHEVRON USA INC — EMPEROR 24 1

EMPEROR (SIMPSON) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API: 42495329390000    CODE: 242,
--- ---
PROPNUM: L8BB176D00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 133 YE2020    01/29/2021    15:43:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 107

Cawley, Gillespie & Associates, Inc.

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Table 108

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MCCABE FP

EMPEROR & HALLEY (YATES) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.048
**** 12-2022 **** 0.044
**** 12-2023 **** 0.040
**** 12-2024 **** 0.036
**** 12-2025 **** 0.033
**** 12-2026 **** 0.030
**** 12-2027 **** 0.026
**** 12-2028 **** 0.024
**** 12-2029 **** 0.022
**** 12-2030 **** 0.019
**** 12-2031 **** 0.018
**** 12-2032 **** 0.016
**** 12-2033 **** 0.015
**** 12-2034 **** 0.013
**** 12-2035 **** 0.012
**** S Tot **** 0.397
**** After **** 0.009
**** Total **** 0.406
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 11.565
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 9.290
**** Revenue **** 15.00 **** 7.749
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 6.654
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 5.845
**** 30.00 **** 5.227
API:    CODE:
--- ---
PROPNUM: L8BB12KE00 12 Months in first year
15.833 Year Life (10/2036)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 3 YE2020    01/29/2021    15:43:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 108

Cawley, Gillespie & Associates, Inc.

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Table 109

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— VARIOUS BROWN ALTMAN PROPERTIES

EMPEROR, EMPEROR EAST (VARIOUS) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 6.225
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 5.706
**** Revenue **** 15.00 **** 5.274
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 4.911
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 4.602
**** 30.00 **** 4.336
API:    CODE:
--- ---
PROPNUM: L8BB12NE00 12 Months in first year
6.250 Year Life (04/2027)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 5 YE2020    01/29/2021    15:43:24
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 109

Cawley, Gillespie & Associates, Inc.

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Table 110

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— VARIOUS BROWN-ALTMAN PROPERTIES

EMPEROR, KERMIT, WEINER (VARIOUS) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.800
**** 12-2022 **** 0.761
**** 12-2023 **** 0.723
**** 12-2024 **** 0.687
**** 12-2025 **** 0.652
**** 12-2026 **** 0.620
**** 12-2027 **** 0.589
**** 12-2028 **** 0.559
**** 12-2029 **** 0.531
**** 12-2030 **** 0.505
**** 12-2031 **** 0.479
**** 12-2032 **** 0.456
**** 12-2033 **** 0.433
**** 12-2034 **** 0.411
**** 12-2035 **** 0.390
**** S Tot **** 8.595
**** After **** 5.771
**** Total **** 14.366
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 590.823
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 407.557
**** Revenue **** 15.00 **** 313.137
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 256.134
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 218.039
**** 30.00 **** 190.775
API:    CODE:
--- ---
PROPNUM: L8BB161E00 12 Months in first year
44.333 Year Life (04/2065)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 126 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 110

Cawley, Gillespie & Associates, Inc.

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Table 111

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— HALLEY UNIT & OTHER HALLEY

HALLEY, EMPEROR, WEINER (VARIOUS) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 1.590
**** 12-2022 **** 1.327
**** 12-2023 **** 1.109
**** 12-2024 **** 0.925
**** 12-2025 **** 0.773
**** 12-2026 **** 0.645
**** 12-2027 **** 0.539
**** 12-2028 **** 0.450
**** 12-2029 **** 0.375
**** 12-2030 **** 0.314
**** 12-2031 **** 0.262
**** 12-2032 **** 0.219
**** 12-2033 **** 0.095
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 8.623
**** After **** 0.000
**** Total **** 8.623
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 594.711
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 507.521
**** Revenue **** 15.00 **** 443.174
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 394.168
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 355.822
**** 30.00 **** 325.110
API:    CODE:
--- ---
PROPNUM: L8BB12LE00 12 Months in first year
12.500 Year Life (07/2033)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 4 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 111

Cawley, Gillespie & Associates, Inc.

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Table 112

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— HENDRICK TG & OTHER HENDRICK

HENDRICK (Various) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 2.673
**** 12-2022 **** 2.553
**** 12-2023 **** 2.438
**** 12-2024 **** 2.329
**** 12-2025 **** 2.224
**** 12-2026 **** 2.123
**** 12-2027 **** 2.028
**** 12-2028 **** 1.936
**** 12-2029 **** 1.850
**** 12-2030 **** 1.766
**** 12-2031 **** 1.687
**** 12-2032 **** 1.611
**** 12-2033 **** 1.539
**** 12-2034 **** 1.469
**** 12-2035 **** 1.403
**** S Tot **** 29.630
**** After **** 23.812
**** Total **** 53.441
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 1,080.856
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 731.532
**** Revenue **** 15.00 **** 557.196
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 453.512
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 384.810
**** 30.00 **** 335.916
API:    CODE:
--- ---
PROPNUM: L8BB12OE00 12 Months in first year
49.917 Year Life (12/2070)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 6 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 112

Cawley, Gillespie & Associates, Inc.

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Table 113

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— TB HENDRICK #3 & “A” #2

HENDRICK (Various) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB16OE00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 127 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 113

Cawley, Gillespie & Associates, Inc.

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Table 114

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— JENKINS VARIOUS

KEYSTONE (COLBY, MCKEE, SILUR) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 1.334
**** 12-2022 **** 1.248
**** 12-2023 **** 1.167
**** 12-2024 **** 1.091
**** 12-2025 **** 1.020
**** 12-2026 **** 0.954
**** 12-2027 **** 0.892
**** 12-2028 **** 0.834
**** 12-2029 **** 0.779
**** 12-2030 **** 0.729
**** 12-2031 **** 0.681
**** 12-2032 **** 0.637
**** 12-2033 **** 0.596
**** 12-2034 **** 0.557
**** 12-2035 **** 0.521
**** S Tot **** 13.040
**** After **** 5.449
**** Total **** 18.489
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 473.665
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 343.201
**** Revenue **** 15.00 **** 270.288
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 224.328
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 192.815
**** 30.00 **** 169.874
API:    CODE:
--- ---
PROPNUM: L8BB12SE00 12 Months in first year
34.333 Year Life (04/2055)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 8 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 114

Cawley, Gillespie & Associates, Inc.

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Table 115

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— KEYSTONE HOLT UNIT

KEYSTONE (HOLT) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 1.196
**** 12-2022 **** 1.124
**** 12-2023 **** 1.057
**** 12-2024 **** 0.993
**** 12-2025 **** 0.933
**** 12-2026 **** 0.878
**** 12-2027 **** 0.825
**** 12-2028 **** 0.776
**** 12-2029 **** 0.729
**** 12-2030 **** 0.685
**** 12-2031 **** 0.644
**** 12-2032 **** 0.605
**** 12-2033 **** 0.569
**** 12-2034 **** 0.535
**** 12-2035 **** 0.502
**** S Tot **** 12.052
**** After **** 5.827
**** Total **** 17.878
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 428.259
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 305.816
**** Revenue **** 15.00 **** 238.993
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 197.434
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 169.172
**** 30.00 **** 148.711
API:    CODE:
--- ---
PROPNUM: L8BB12TE00 12 Months in first year
36.750 Year Life (10/2057)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 9 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 115

Cawley, Gillespie & Associates, Inc.

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Table 116

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MCCUTCHEN W A VARIOUS

KEYSTONE (COLBY, MCKEE) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.107
**** 12-2022 **** 0.096
**** 12-2023 **** 0.086
**** 12-2024 **** 0.078
**** 12-2025 **** 0.070
**** 12-2026 **** 0.063
**** 12-2027 **** 0.056
**** 12-2028 **** 0.051
**** 12-2029 **** 0.046
**** 12-2030 **** 0.041
**** 12-2031 **** 0.037
**** 12-2032 **** 0.033
**** 12-2033 **** 0.030
**** 12-2034 **** 0.027
**** 12-2035 **** 0.025
**** S Tot **** 0.846
**** After **** 0.120
**** Total **** 0.966
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 68.879
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 54.015
**** Revenue **** 15.00 **** 44.529
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 38.036
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 33.340
**** 30.00 **** 29.794
API:    CODE:
--- ---
PROPNUM: L8BB16DD00 12 Months in first year
22.500 Year Life (07/2043)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 128 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 116

Cawley, Gillespie & Associates, Inc.

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Table 117

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— SO KEYSTONE ELLENBURGER UNIT

KEYSTONE (ELLENBURGER) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 188.299
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 155.866
**** Revenue **** 15.00 **** 133.128
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 116.490
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 103.872
**** 30.00 **** 94.010
API:    CODE:
--- ---
PROPNUM: L8BB12VE00 12 Months in first year
15.583 Year Life (07/2036)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 10 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 117

Cawley, Gillespie & Associates, Inc.

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Table 118

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— SO KEYSTONE SILURIAN UNIT

KEYSTONE (VARIOUS) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.232
**** 12-2022 **** 0.197
**** 12-2023 **** 0.167
**** 12-2024 **** 0.142
**** 12-2025 **** 0.121
**** 12-2026 **** 0.103
**** 12-2027 **** 0.087
**** 12-2028 **** 0.074
**** 12-2029 **** 0.063
**** 12-2030 **** 0.054
**** 12-2031 **** 0.046
**** 12-2032 **** 0.039
**** 12-2033 **** 0.026
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 1.350
**** After **** 0.000
**** Total **** 1.350
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 42.113
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 35.634
**** Revenue **** 15.00 **** 30.904
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 27.335
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 24.565
**** 30.00 **** 22.362
API:    CODE:
--- ---
PROPNUM: L8BB12QE00 12 Months in first year
12.750 Year Life (10/2033)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 7 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 118

Cawley, Gillespie & Associates, Inc.

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Table 119

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— TALVEZ (7) (TRUST)

KEYSTONE (DEVONIAN, SILURIAN) FIELD — WINKLER COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB170D00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 129 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
GAS PDP
Table 119

Cawley, Gillespie & Associates, Inc.

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Table 120

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— OWNBY SADR & CENTRAL OWNBY UNITS

OWNBY (SAN ANDRES & CLRFK) FIELD — YOAKUM COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.411
**** 12-2022 **** 0.368
**** 12-2023 **** 0.330
**** 12-2024 **** 0.294
**** 12-2025 **** 0.264
**** 12-2026 **** 0.236
**** 12-2027 **** 0.212
**** 12-2028 **** 0.190
**** 12-2029 **** 0.169
**** 12-2030 **** 0.152
**** 12-2031 **** 0.136
**** 12-2032 **** 0.122
**** 12-2033 **** 0.108
**** 12-2034 **** 0.097
**** 12-2035 **** 0.087
**** S Tot **** 3.174
**** After **** 0.360
**** Total **** 3.534
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 95.917
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 75.958
**** Revenue **** 15.00 **** 62.995
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 54.017
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 47.474
**** 30.00 **** 42.508
API:    CODE:
--- ---
PROPNUM: L8BB121D00 12 Months in first year
21.000 Year Life (01/2042)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 14 YE2020     01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 120

Cawley, Gillespie & Associates, Inc.

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Table 121

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— BENNETT RANCH UNIT

WASSON (Various) FIELD — YOAKUM COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 8.488
**** 12-2022 **** 7.958
**** 12-2023 **** 7.441
**** 12-2024 **** 6.957
**** 12-2025 **** 6.505
**** 12-2026 **** 6.082
**** 12-2027 **** 5.687
**** 12-2028 **** 5.317
**** 12-2029 **** 4.972
**** 12-2030 **** 4.648
**** 12-2031 **** 4.346
**** 12-2032 **** 4.064
**** 12-2033 **** 3.800
**** 12-2034 **** 3.553
**** 12-2035 **** 3.322
**** S Tot **** 83.141
**** After **** 34.897
**** Total **** 118.037
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 2,740.341
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 1,984.806
**** Revenue **** 15.00 **** 1,562.849
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 1,296.939
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 1,114.632
**** 30.00 **** 981.918
API:    CODE:
--- ---
PROPNUM: L8BB171D00 12 Months in first year
34.500 Year Life (07/2055)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 130 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 121

Cawley, Gillespie & Associates, Inc.

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Table 122

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— DENVER UNIT

WASSON (Various) FIELD — YOAKUM COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
EndMo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProductionMBBLS Net GasSalesMMCF Avg OilPrice /BBL Avg GasPrice /MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 34.634
**** 12-2022 **** 33.076
**** 12-2023 **** 31.587
**** 12-2024 **** 30.166
**** 12-2025 **** 28.808
**** 12-2026 **** 27.512
**** 12-2027 **** 26.274
**** 12-2028 **** 25.092
**** 12-2029 **** 23.962
**** 12-2030 **** 22.885
**** 12-2031 **** 21.854
**** 12-2032 **** 20.871
**** 12-2033 **** 19.932
**** 12-2034 **** 19.035
**** 12-2035 **** 18.178
**** S Tot **** 383.865
**** After **** 307.897
**** Total **** 691.762
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 13,916.913
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 9,412.626
**** Revenue **** 15.00 **** 7,166.377
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 5,831.271
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 4,946.987
**** 30.00 **** 4,317.850
API:    CODE:
--- ---
PROPNUM: L8BB121E00 12 Months in first year
49.750 Year Life (10/2070)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 13 YE2020    01/29/2021    15:43:25
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 122

Cawley, Gillespie & Associates, Inc.

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Table 123

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— WOOTEN H

WASSON (Various) FIELD — YOAKUM COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.000
**** 12-2022 **** 0.000
**** 12-2023 **** 0.000
**** 12-2024 **** 0.000
**** 12-2025 **** 0.000
**** 12-2026 **** 0.000
**** 12-2027 **** 0.000
**** 12-2028 **** 0.000
**** 12-2029 **** 0.000
**** 12-2030 **** 0.000
**** 12-2031 **** 0.000
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.000
**** After **** 0.000
**** Total **** 0.000
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 0.000
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 0.000
**** Revenue **** 15.00 **** 0.000
**** Oil **** 0.0000 **** 0.0000 **** 20.00 **** 0.000
**** Gas **** 0.0000 **** 0.0000 **** 25.00 **** 0.000
**** 30.00 **** 0.000
API:    CODE:
--- ---
PROPNUM: L8BB173D00 12 Months in first year
0.000 Year Life (01/2021)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 131 YE2020    01/29/2021    15:43:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 123

Cawley, Gillespie & Associates, Inc.

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Table 124

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— WASSON NORTH CLFK UNIT

WASSON & WASSON NORTHEAST (Various) FIELD — YOAKUM COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 1.192
**** 12-2022 **** 1.115
**** 12-2023 **** 1.043
**** 12-2024 **** 0.975
**** 12-2025 **** 0.911
**** 12-2026 **** 0.852
**** 12-2027 **** 0.797
**** 12-2028 **** 0.745
**** 12-2029 **** 0.696
**** 12-2030 **** 0.651
**** 12-2031 **** 0.609
**** 12-2032 **** 0.569
**** 12-2033 **** 0.532
**** 12-2034 **** 0.498
**** 12-2035 **** 0.465
**** S Tot **** 11.652
**** After **** 4.807
**** Total **** 16.459
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 380.051
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 275.595
**** Revenue **** 15.00 **** 217.095
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 180.192
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 154.882
**** 30.00 **** 136.455
API:    CODE:
--- ---
PROPNUM: L8BB123D00 12 Months in first year
33.833 Year Life (10/2054)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 15 YE2020    01/29/2021    15:43:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 124

Cawley, Gillespie & Associates, Inc.

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Table 125

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— MILLER ANNIE, STEVENS SUE & SMAR

WASSON (WICHITA ALBANY) FIELD — YOAKUM COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 0.722
**** 12-2022 **** 0.671
**** 12-2023 **** 0.624
**** 12-2024 **** 0.580
**** 12-2025 **** 0.539
**** 12-2026 **** 0.502
**** 12-2027 **** 0.467
**** 12-2028 **** 0.435
**** 12-2029 **** 0.404
**** 12-2030 **** 0.375
**** 12-2031 **** 0.349
**** 12-2032 **** 0.324
**** 12-2033 **** 0.302
**** 12-2034 **** 0.281
**** 12-2035 **** 0.261
**** S Tot **** 6.836
**** After **** 2.454
**** Total **** 9.290
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 220.819
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 162.250
**** Revenue **** 15.00 **** 128.743
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 107.337
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 92.538
**** 30.00 **** 81.706
API:    CODE:
--- ---
PROPNUM: L8BB124D00 12 Months in first year
31.917 Year Life (12/2052)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 16 YE2020    01/29/2021    15:43:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 125

Cawley, Gillespie & Associates, Inc.

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Table 126

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— YOAKUM WASSON CLEARFORK UNIT

WASSON 72 (Various) FIELD — YOAKUM COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
Gross Oil Gross Gas Net Oil Net Gas Avg Oil Avg Gas Oil Gas Total
End Production Production Production Sales Price Price Revenue Revenue Revenue
Mo-Year MBBLS MMCF MBBLS MMCF /BBL /MCF M M M
**** 12-2021 **** 2.902
**** 12-2022 **** 2.535
**** 12-2023 **** 2.233
**** 12-2024 **** 1.982
**** 12-2025 **** 1.772
**** 12-2026 **** 1.593
**** 12-2027 **** 1.439
**** 12-2028 **** 1.307
**** 12-2029 **** 1.192
**** 12-2030 **** 1.093
**** 12-2031 **** 1.005
**** 12-2032 **** 0.926
**** 12-2033 **** 0.858
**** 12-2034 **** 0.796
**** 12-2035 **** 0.740
**** S Tot **** 22.373
**** After **** 6.594
**** Total **** 28.968
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
Production Ad Valorem Wells Operating Other Future Net Cumulative Cum.Cash Flow
End Taxes Taxes Gross Net Expense Deductions Investment Cash Flow Cash Flow Disc.@ 10.0%
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 **** .0
**** 12-2022 **** .0 **** .0
**** 12-2023 **** .0 **** .0
**** 12-2024 **** .0 **** .0
**** 12-2025 **** .0 **** .0
**** 12-2026 **** .0 **** .0
**** 12-2027 **** .0 **** .0
**** 12-2028 **** .0 **** .0
**** 12-2029 **** .0 **** .0
**** 12-2030 **** .0 **** .0
**** 12-2031 **** .0 **** .0
**** 12-2032 **** .0 **** .0
**** 12-2033 **** .0 **** .0
**** 12-2034 **** .0 **** .0
**** 12-2035 **** .0 **** .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 720.549
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 546.574
**** Revenue **** 15.00 **** 443.989
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 376.939
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 329.710
**** 30.00 **** 294.579
API:    CODE:
--- ---
PROPNUM: L8BB126D00 12 Months in first year
28.583 Year Life (07/2049)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 17 YE2020    01/29/2021    15:43:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 126

Cawley, Gillespie & Associates, Inc.

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Table 127

Reserve Estimates and Economic Forecasts as of December 31, 2020

Permian Basin Royalty Trust Interests - Texas Royalty Properties

Proved Developed Producing Reserves

— EAST WASSON CLEARFORK UNIT

WASSON NORTHEAST (CLEARFORK) FIELD — YOAKUM COUNTY, TEXAS

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
End<br>Mo-Year Gross OilProductionMBBLS Gross GasProductionMMCF Net OilProduction<br>MBBLS Net GasSalesMMCF Avg OilPrice/BBL Avg GasPrice/MCF OilRevenueM GasRevenueM TotalRevenueM
**** 12-2021 **** 0.045
**** 12-2022 **** 0.039
**** 12-2023 **** 0.033
**** 12-2024 **** 0.028
**** 12-2025 **** 0.025
**** 12-2026 **** 0.021
**** 12-2027 **** 0.019
**** 12-2028 **** 0.016
**** 12-2029 **** 0.013
**** 12-2030 **** 0.011
**** 12-2031 **** 0.001
**** 12-2032 **** 0.000
**** 12-2033 **** 0.000
**** 12-2034 **** 0.000
**** 12-2035 **** 0.000
**** S Tot **** 0.251
**** After **** 0.000
**** Total **** 0.251
**** Cum
**** Ult
(11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
End Production<br>Taxes Ad Valorem<br>Taxes Wells Operating<br>Expense Other<br>Deductions Investment Future Net<br>Cash Flow Cumulative<br>Cash Flow Cum.Cash Flow<br>Disc.@ 10.0%
Net
Mo-Year M M Count M M M M M M
**** 12-2021 **** .0 .0
**** 12-2022 **** .0 .0
**** 12-2023 **** .0 .0
**** 12-2024 **** .0 .0
**** 12-2025 **** .0 .0
**** 12-2026 **** .0 .0
**** 12-2027 **** .0 .0
**** 12-2028 **** .0 .0
**** 12-2029 **** .0 .0
**** 12-2030 **** .0 .0
**** 12-2031 **** .0 .0
**** 12-2032 **** .0 .0
**** 12-2033 **** .0 .0
**** 12-2034 **** .0 .0
**** 12-2035 **** .0 .0
**** S Tot **** .0
**** After **** .0
**** Total **** .0

All values are in US Dollars.

Percent Interests Percent Cum. Disc.
Initial Final 5.00 7.625
**** Expense **** 0.0000 **** 0.0000 **** 10.00 **** 6.541
**** Revenue **** 15.00 **** 5.723
**** Oil **** 100.0000 **** 100.0000 **** 20.00 **** 5.090
**** Gas **** 100.0000 **** 100.0000 **** 25.00 **** 4.589
**** 30.00 **** 4.186
API:    CODE:
--- ---
PROPNUM: L8BB17CD00 12 Months in first year
10.083 Year Life (01/2031)
THESE DATA ARE PART OF A CG&A REPORT AND ARE SUBJECT TO THE CONDITIONS IN THE TEXT OF THE REPORT. ASN 137 YE2020    01/29/2021    15:43:26
--- --- ---
TEXAS REGISTERED ENGINEERING FIRM F-693.
OIL PDP
Table 127

Cawley, Gillespie & Associates, Inc.

WADDELL RANCH PROPERTIES

PERMIAN BASIN ROYALTY TRUST INTEREST COMPUTATION

On November 1, 1980, Southland Royalty Company transferred to the Trust a net overriding royalty equivalent to a 75 percent net profit interest of the Total Controlled Interests in Waddell Ranch. Production and revenue for the Trust are calculated from the projection of estimated reserves and income for the Total Controlled Interests. Production attributable to the Trust is computed by allocating a part of the Total Controlled Interests’ net production on a year by year basis. The allocation factor is given by:

Allocation Factor = 0.75 x Net Profit
Gross Profit

where

Net Profit = Revenue - Taxes* - Operating Costs - Investment

Gross Profit = Revenue - Taxes*

* Taxes include the Windfall Profit Tax and severance, but no ad valorem taxes. Ad valorem taxes are included in<br>operating costs.

The Trust allocation factor is determined separately for oil and gas. Cost and investments divisions are made using the same ratio as the oil and gas divisions. Production and revenue (due to oil or gas) attributable to the Trust are calculated by multiplying the Total Controlled Interests’ net production by the respective Trust allocation factor for the particular year.

TEXAS ROYALTY PROPERTIES

PERMIAN BASIN ROYALTY TRUST INTEREST COMPUTATION

On November 1, 1980, Southland Royalty Company transferred to the Trust a net overriding royalty equivalent to a 95 percent net profit interest of the Total Controlled Interests in Texas Royalty Properties. Production and revenue for the Trust are calculated from the projection of estimated reserves and income for the Total Controlled Interests. Production attributable to the Trust is computed by allocating a part of the Total Controlled Interests’ net production on a year by year basis. The allocation factor is given by:

Allocation Factor = 0.95 x Net Profit
Gross Profit

where

Net Profit = Revenue - Windfall Profit Taxes - Severance Taxes - Ad Valorem Taxes

Gross Profit = Revenue - Windfall Profit Taxes - Severance Taxes

The Trust allocation factor is determined separately for oil and gas. Ad valorem tax divisions are made using the same ratio as the oil and gas divisions. Production and revenue (due to oil or gas) attributable to the Trust are calculated by multiplying the Total Controlled Interests’ net production by the respective Trust allocation factor for the particular year.

APPENDIX

Explanatory Comments for Summary Tables

HEADINGS

Table I

Description of Table Information

Identity of Interest Evaluated

Reserve Classification and Development Status

Property Description – Location

Effective Date of Evaluation

FORECAST

(Columns)
(1) (11) Calendar or Fiscal years/months commencing on effective date.
(2) (3) Gross Production (8/8th) for the years/months which are economical. These are expressed as thousands of barrels (Mbbl) and millions of cubic feet (MMcf) of gas at standard conditions. Total future production, cumulative<br>production to effective date, and ultimate recovery at the effective date are shown following the annual/monthly forecasts.
(4) (5) Net Production accruable to evaluated interest is calculated by multiplying the revenue interest times the gross production. These values take into account changes in interest and gas shrinkage.
(6) Average (volume weighted) gross liquid price per barrel before deducting production-severance taxes.
(7) Average (volume weighted) gross gas price per Mcf before deducting production-severance taxes.
(8) Revenue derived from oil sales — column (4) times column (6).
(9) Revenue derived from gas sales — column (5) times column (7).
(10) Total Revenue — column (8) plus column (9) plus other miscellaneous revenue.
(12) Production-severance taxes deducted from gross oil and gas revenue.
(13) Ad valorem taxes.
(14) Average gross wells.
(15) Average net wells are gross wells times working interest.
(16) Operating Expenses are direct operating expenses to the evaluated working interest, but may also include items noted below in “Other Deductions”. In addition, ad valorem taxes can also be included in this<br>column.
(17) Other Deductions include operator’s overhead, compression-gathering expenses, transportation costs, water disposal costs and net profits burdens. These are the share of costs payable by the evaluated expense interests<br>and take into account any changes in interests.
(18) Investments, if any, include work-overs, future drilling costs, pumping units, etc. and may be included either tangible or intangible or both, and the costs for plugging and the salvage value of equipment at abandonment<br>may be shown as negative investments at end of life.
(19) (20) Future Net Cash Flow is column (10) less columns (12), (13), (16), (17) and (18). The data in column (19) are accumulated in column (20). Federal income taxes have not been considered.
(21) Cumulative Discounted Cash Flow is calculated by discounting monthly cash flows at the specified annual rates.
MISCELLANEOUS
DCF Profile •   The cash flow discounted at six different rates are shown at the<br>bottom of columns (20-21). Interest has been compounded once per year.
Life •   The economic life of the appraised property is noted in the lower<br>right-hand corner of the table.
Footnotes •   Comments regarding the evaluation may be shown in the lower<br>left-hand footnotes.
Cawley, Gillespie & Associates, Inc. Appendix<br><br><br>Page 1
--- ---

APPENDIX

Methods Employed in the Estimation of Reserves

The four methods customarily employed in the estimation of reserves are (1)production performance, (2)material balance, (3)volumetric and (4)analogy. Most estimates, although based primarily on one method, utilize other methods depending on the nature and extent of the data available and the characteristics of the reservoirs.

Basic information includes production, pressure, geological and laboratory data. However, a large variation exists in the quality, quantity and types of information available on individual properties. Operators are generally required by regulatory authorities to file monthly production reports and may be required to measure and report periodically such data as well pressures, gas-oil ratios, well tests, etc. As a general rule, an operator has complete discretion in obtaining and/or making available geological and engineering data. The resulting lack of uniformity in data renders impossible the application of identical methods to all properties, and may result in significant differences in the accuracy and reliability of estimates.

A brief discussion of each method, its basis, data requirements, applicability and generalization as to its relative degree of accuracy follows:

Production performance. This method employs graphical analyses of production data on the premise that all factors which have controlled the performance to date will continue to control and that historical trends can be extrapolated to predict future performance. The only information required is production history. Capacity production can usually be analyzed from graphs of rates versus time or cumulative production. This procedure is referred to as “decline curve” analysis. Both capacity and restricted production can, in some cases, be analyzed from graphs of producing rate relationships of the various production components. Reserve estimates obtained by this method are generally considered to have a relatively high degree of accuracy with the degree of accuracy increasing as production history accumulates.

Material balance. This method employs the analysis of the relationship of production and pressure performance on the premise that the reservoir volume and its initial hydrocarbon content are fixed and that this initial hydrocarbon volume and recoveries therefrom can be estimated by analyzing changes in pressure with respect to production relationships. This method requires reliable pressure and temperature data, production data, fluid analyses and knowledge of the nature of the reservoir. The material balance method is applicable to all reservoirs, but the time and expense required for its use is dependent on the nature of the reservoir and its fluids. Reserves for depletion type reservoirs can be estimated from graphs of pressures corrected for compressibility versus cumulative production, requiring only data that are usually available. Estimates for other reservoir types require extensive data and involve complex calculations most suited to computer models which makes this method generally applicable only to reservoirs where there is economic justification for its use. Reserve estimates obtained by this method are generally considered to have a degree of accuracy that is directly related to the complexity of the reservoir and the quality and quantity of data available.

Volumetric. This method employs analyses of physical measurements of rock and fluid properties to calculate the volume of hydrocarbons in-place. The data required are well information sufficient to determine reservoir subsurface datum, thickness, storage volume, fluid content and location. The volumetric method is most applicable to reservoirs which are not susceptible to analysis by production performance or material balance methods. These are most commonly newly developed and/or no-pressure depleting reservoirs. The amount of hydrocarbons in-place that can be recovered is not an integral part of the volumetric calculations but is an estimate inferred by other methods and a knowledge of the nature of the reservoir. Reserve estimates obtained by this method are generally considered to have a low degree of accuracy; but the degree of accuracy can be relatively high where rock quality and subsurface control is good and the nature of the reservoir is uncomplicated.

Analogy. This method which employs experience and judgment to estimate reserves, is based on observations of similar situations and includes consideration of theoretical performance. The analogy method is applicable where the data are insufficient or so inconclusive that reliable reserve estimates cannot be made by other methods. Reserve estimates obtained by this method are generally considered to have a relatively low degree of accuracy.

Much of the information used in the estimation of reserves is itself arrived at by the use of estimates. These estimates are subject to continuing change as additional information becomes available. Reserve estimates which presently appear to be correct may be found to contain substantial errors as time passes and new information is obtained about well and reservoir performance.

Cawley, Gillespie & Associates, Inc. Appendix<br><br><br>Page 2

APPENDIX

Reserve Definitions and Classifications

The Securities and Exchange Commission, in SX Reg. 210.4-10 dated November 18, 1981, as amended on September 19, 1989 and January 1, 2010, requires adherence to the following definitions of oil and gas reserves:

“(22) Proved oil and gas reserves. Proved oil and gas reserves are those quantities of oil and gas, which, by analysis of geoscience and engineering data, can be estimated with reasonable certainty to be economically producible—from a given date forward, from known reservoirs, and under existing economic conditions, operating methods, and government regulations— prior to the time at which contracts providing the right to operate expire, unless evidence indicates that renewal is reasonably certain, regardless of whether deterministic or probabilistic methods are used for the estimation. The project to extract the hydrocarbons must have commenced or the operator must be reasonably certain that it will commence the project within a reasonable time.

“(i) The area of a reservoir considered as proved includes: (A) The area identified by drilling and limited by fluid contacts, if any, and (B) Adjacent undrilled portions of the reservoir that can, with reasonable certainty, be judged to be continuous with it and to contain economically producible oil or gas on the basis of available geoscience and engineering data.

“(ii) In the absence of data on fluid contacts, proved quantities in a reservoir are limited by the lowest known hydrocarbons (LKH) as seen in a well penetration unless geoscience, engineering, or performance data and reliable technology establishes a lower contact with reasonable certainty.

“(iii) Where direct observation from well penetrations has defined a highest known oil (HKO) elevation and the potential exists for an associated gas cap, proved oil reserves may be assigned in the structurally higher portions of the reservoir only if geoscience, engineering, or performance data and reliable technology establish the higher contact with reasonable certainty. “(iv) Reserves which can be produced economically through application of improved recovery techniques (including, but not limited to, fluid injection) are included in the proved classification when: (A) Successful testing by a pilot project in an area of the reservoir with properties no more favorable than in the reservoir as a whole, the operation of an installed program in the reservoir or an analogous reservoir, or other evidence using reliable technology establishes the reasonable certainty of the engineering analysis on which the project or program was based; and (B) The project has been approved for development by all necessary parties and entities, including governmental entities.

“(v) Existing economic conditions include prices and costs at which economic producibility from a reservoir is to be determined. The price shall be the average price during the 12-month period prior to the ending date of the period covered by the report, determined as an unweighted arithmetic average of the first-day-of-the-month price for each month within such period, unless prices are defined by contractual arrangements, excluding escalations based upon future conditions.

“(6) Developed oil and gas reserves. Developed oil and gas reserves are reserves of any category that can be expected to be recovered:

“(i) Through existing wells with existing equipment and operating methods or in which the cost of the required equipment is relatively minor compared to the cost of a new well; and

“(ii) Through installed extraction equipment and infrastructure operational at the time of the reserves estimate if the extraction is by means not involving a well.

“(31) Undeveloped oil and gas reserves. Undeveloped oil and gas reserves are reserves of any category that are expected to be recovered from new wells on undrilled acreage, or from existing wells where a relatively major expenditure is required for recompletion.

“(i) Reserves on undrilled acreage shall be limited to those directly offsetting development spacing areas that are reasonably certain of production when drilled, unless evidence using reliable technology exists that establishes reasonable certainty of economic producibility at greater distances.

“(ii) Undrilled locations can be classified as having undeveloped reserves only if a development plan has been adopted indicating that they are scheduled to be drilled within five years, unless the specific circumstances, justify a longer time.

“(iii) Under no circumstances shall estimates for undeveloped reserves be attributable to any acreage for which an application of fluid injection or other improved recovery technique is contemplated, unless such techniques have been proved effective by actual projects in the same reservoir or an analogous reservoir, as defined in paragraph (a)(2) of this section, or by other evidence using reliable technology establishing reasonable certainty.

Cawley, Gillespie & Associates, Inc. Appendix<br><br><br>Page 3

“(18) Probable reserves. Probable reserves are those additional reserves that are less certain to be recovered than proved reserves but which, together with proved reserves, are as likely as not to be recovered.

“(i) When deterministic methods are used, it is as likely as not that actual remaining quantities recovered will exceed the sum of estimated proved plus probable reserves. When probabilistic methods are used, there should be at least a 50% probability that the actual quantities recovered will equal or exceed the proved plus probable reserves estimates.

“(ii) Probable reserves may be assigned to areas of a reservoir adjacent to proved reserves where data control or interpretations of available data are less certain, even if the interpreted reservoir continuity of structure or productivity does not meet the reasonable certainty criterion. Probable reserves may be assigned to areas that are structurally higher than the proved area if these areas are in communication with the proved reservoir.

“(iii) Probable reserves estimates also include potential incremental quantities associated with a greater percentage recovery of the hydrocarbons in place than assumed for proved reserves.

“(iv) See also guidelines in paragraphs (17)(iv) and (17)(vi) of this section (below).

“(17) Possible reserves. Possible reserves are those additional reserves that are less certain to be recovered than probable reserves.

“(i) When deterministic methods are used, the total quantities ultimately recovered from a project have a low probability of exceeding proved plus probable plus possible reserves. When probabilistic methods are used, there should be at least a 10% probability that the total quantities ultimately recovered will equal or exceed the proved plus probable plus possible reserves estimates.

“(ii) Possible reserves may be assigned to areas of a reservoir adjacent to probable reserves where data control and interpretations of available data are progressively less certain. Frequently, this will be in areas where geoscience and engineering data are unable to define clearly the area and vertical limits of commercial production from the reservoir by a defined project.

“(iii) Possible reserves also include incremental quantities associated with a greater percentage recovery of the hydrocarbons in place than the recovery quantities assumed for probable reserves.

“(iv) The proved plus probable and proved plus probable plus possible reserves estimates must be based on reasonable alternative technical and commercial interpretations within the reservoir or subject project that are clearly documented, including comparisons to results in successful similar projects.

“(v) Possible reserves may be assigned where geoscience and engineering data identify directly adjacent portions of a reservoir within the same accumulation that may be separated from proved areas by faults with displacement less than formation thickness or other geological discontinuities and that have not been penetrated by a wellbore, and the registrant believes that such adjacent portions are in communication with the known (proved) reservoir. Possible reserves may be assigned to areas that are structurally higher or lower than the proved area if these areas are in communication with the proved reservoir.

“(vi) Pursuant to paragraph (22)(iii) of this section (above), where direct observation has defined a highest known oil (HKO) elevation and the potential exists for an associated gas cap, proved oil reserves should be assigned in the structurally higher portions of the reservoir above the HKO only if the higher contact can be established with reasonable certainty through reliable technology. Portions of the reservoir that do not meet this reasonable certainty criterion may be assigned as probable and possible oil or gas based on reservoir fluid properties and pressure gradient interpretations.”

Instruction 4 of Item 2(b) of Securities and Exchange Commission Regulation S-K was revised January 1, 2010 to state that “a registrant engaged in oil and gas producing activities shall provide the information required by Subpart 1200 of Regulation S–K.” This is relevant in that Instruction 2 to paragraph (a)(2) states: “The registrant is permitted, but not required, to disclose probable or possible reserves pursuant to paragraphs (a)(2)(iv) through (a)(2)(vii) of this Item.”

“(26) Reserves. Reserves are estimated remaining quantities of oil and gas and related substances anticipated to be economically producible, as of a given date, by application of development projects to known accumulations. In addition, there must exist, or there must be a reasonable expectation that there will exist, the legal right to produce or a revenue interest in the production, installed means of delivering oil and gas or related substances to market, and all permits and financing required to implement the project.

“Note to paragraph (26): Reserves should not be assigned to adjacent reservoirs isolated by major, potentially sealing, faults until those reservoirs are penetrated and evaluated as economically producible. Reserves should not be assigned to areas that are clearly separated from a known accumulation by a non-productive reservoir (i.e., absence of reservoir, structurally low reservoir, or negative test results). Such areas may contain prospective resources (i.e., potentially recoverable resources from undiscovered accumulations).”

Cawley, Gillespie & Associates, Inc. Appendix<br><br><br>Page 4