8-K

MACH NATURAL RESOURCES LP (MNR)

8-K 2025-12-10 For: 2025-12-10
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Added on April 04, 2026

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549


FORM 8-K


Current ReportPursuant to Section 13 or 15(d)of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported):December 10, 2025

Mach Natural Resources LP

(Exact name of registrant as specified in itscharter)

Delaware 001-41849 93-1757616
(State or other jurisdictionof incorporation) (Commission File Number) (IRS EmployerIdentification No.)
14201 Wireless Way, Suite 300, Oklahoma City, Oklahoma 73134
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(Address of principal executive offices) (Zip Code)

(405) 252-8100

Registrant’s telephone number, includingarea code


Not applicable.

(Former name or former address, if changed sincelast 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:

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 CFR 240.14a-12)
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Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
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Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
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Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol Name of exchange on which registered
Common units representing limited partner interests MNR 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. ☐

EXPLANATORY NOTE


As previously disclosed, on September 16, 2025, Mach Natural Resources LP (the “Company”) completed the acquisition of (i) certain rights, title and interests in oil and gas properties, rights and related assets located in certain designated lands in the Permian Basin from Sabinal Energy Operating, LLC, Sabinal Resources, LLC and Sabinal CBP, LLC and (ii) 100% of the membership interests in SIMCOE LLC and Simlog LLC from VEPU Inc. and Simlog Inc. The Company is filing this Current Report on Form 8-K to provide certain unaudited pro forma financial information regarding the acquisitions in connection with the Registration Statement on Form S-3 filed by the Company with the U.S. Securities and Exchange Commission on September 22, 2025.


Item 9.01. Financial Statements and Exhibits.


(b) Pro forma financial information.

The unaudited pro forma condensed combined statements of operations for the nine months ended September 30, 2025 are filed herewith and attached hereto as Exhibit 99.1, and are incorporated herein by reference.


(d) Exhibits.


Exhibit No. Description
99.1 Unaudited Pro Forma Condensed Combined Financial Statements of Mach Natural Resources LP for the nine months ended September 30, 2025.
104 Cover Page Interactive Data File (formatted as Inline XBRL).
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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 hereunto duly authorized.

Mach Natural Resources LP
By: Mach Natural Resources GP LLC,
its general partner
Dated: December 10, 2025 By: /s/ Tom L. Ward
Name: Tom L. Ward
Title: Chief Executive Officer
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Exhibit 99.1


MACH NATURAL RESOURCES LP

Unaudited Pro Forma Condensed CombinedFinancial Statements


Introduction

Mach Natural Resources LP (the “Company”) is a limited partnership focused on the acquisition, development and production of oil, natural gas and natural gas liquid (“NGL”) reserves in the Anadarko Basin region of Western Oklahoma, Southern Kansas and the panhandle of Texas; the San Juan Basin region of New Mexico and Colorado; and the Permian Basin region of West Texas.

On July 9, 2025, the Company entered into a membership interest purchase agreement (the “IKAV Purchase Agreement”) with VEPU Inc. and Simlog Inc. (collectively, the “IKAV Sellers”), pursuant to which the Company would acquire one hundred percent (100%) of the IKAV Sellers’ membership interests in certain rights, titles and interests in oil and gas properties, rights and related assets located in certain designated lands in the San Juan Basin of New Mexico and Colorado. Specifically, the Company acquired 100% of the membership interests of SIMCOE LLC (“SIMCOE”) and Simlog LLC from VEPU Inc. and Simlog Inc, respectively. Simlog LLC owns 100% of the issued and outstanding equity interests of SJ INVESTMENT OPPS LLC (“SJ” and together with SIMCOE, the “IKAV Companies”), which represents substantially all of Simlog LLC. On September 16, 2025, the Company entered into that certain First Amendment to the IKAV Purchase Agreement (the “IKAV Purchase Agreement Amendment” and together with the IKAV Purchase Agreement, the “IKAV MIPA”).

On September 16, 2025, the Company acquired the IKAV Companies, pursuant to the IKAV MIPA, for consideration of approximately $759.6 million comprising (i) $349.8 million in cash and (ii) 30.6 million common units of the Company (the “IKAV Unit Consideration”), subject to certain customary post-close adjustments (such transaction, the “IKAV Acquisition”). The IKAV Unit Consideration has a value of approximately $409.9 million.

On July 9, 2025, the Company entered into a Purchase and Sale Agreement (the “Sabinal PSA”) with Sabinal Energy Operating, LLC, Sabinal Resources, LLC and Sabinal CBP, LLC (collectively, the “Sabinal Sellers”), pursuant to which the Company would acquire certain oil and gas assets located in certain designated lands in the Permian Basin (the “Sabinal Assets”).

On September 16, 2025, the Company acquired the Sabinal Assets, pursuant to the Sabinal PSA, for consideration of approximately $456.2 million comprising (i) $199.3 million in cash and (ii) 19.2 million common units (the “Sabinal Unit Consideration”), subject to certain customary post-close adjustments (such transaction, the “Sabinal Acquisition” and together with the IKAV Acquisition, the “Transactions”). The Sabinal Unit Consideration has a value of approximately $256.9 million.

The unaudited pro forma condensed combined financial statements (the “pro forma financial statements”) have been prepared in accordance with Article 11 of Regulation S-X, Pro Forma Financial Information, using assumptions set forth in the notes to the unaudited pro forma financial statements. The following unaudited pro forma condensed combined financial statements (the “pro forma financial statements”) reflect the historical results of the Company, SIMCOE, SJ, and Sabinal Energy Operating, LLC and subsidiaries (“Sabinal”) on a pro forma basis to give effect to the Transactions, which are described in further detail below, as if they had occurred on January 1, 2024 for the unaudited condensed combined pro forma statements of operations (the “pro forma statements of operations”):

1. The consummation of the IKAV Acquisition pursuant to the<br>terms of the IKAV MIPA.
2. The consummation of the Sabinal Acquisition pursuant to the terms of the Sabinal PSA.
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3. The entrance into the First Amendment to the Company’s credit agreement as further described in “Note 1 – Basis<br>of Pro Forma Presentation” included elsewhere in these pro forma financial statements.
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The pro forma adjustments are based on currently available information which is considered preliminary and is based on certain estimates and assumptions. Therefore, the actual adjustments may differ from the pro forma adjustments. However, management believes that the assumptions provide a reasonable basis for presenting the significant effects of the Transactions as contemplated and the pro forma adjustments give appropriate effect to those assumptions and are properly applied in the pro forma financial statements. The Company has not included any adjustments depicting synergies or dis-synergies of the IKAV Acquisition or the Sabinal Acquisition.

The pro forma financial statements and related notes are presented for illustrative purposes only. If the IKAV Acquisition and the Sabinal Acquisition had occurred in the past, the Company’s operating results might have been materially different from those presented in the pro forma financial statements. The pro forma financial statements should not be relied upon as an indication of operating results that the Company would have achieved if the IKAV Acquisition and the Sabinal Acquisition had taken place on the dates specified in the pro forma financial statements. In addition, future results may vary significantly from the results reflected in the pro forma financial statements of operations and should not be relied upon as an indication of the future results the Company.

MACHNATURAL RESOURCES LP

Unaudited Pro Forma Condensed CombinedStatement of Operations

For the Nine Months Ended September30, 2025


(in thousands, except per unit data)

Mach Natural Resources LP <br> (Historical) IKAV Companies <br> As Adjusted<br> (See Note 4) Sabinal Assets <br> As Adjusted<br> (See Note 5) Transaction Accounting Adjustments <br> (Pro Forma) Mach Natural Resources LP<br> Combined <br> (Pro Forma)
Revenue
Oil, natural gas, and NGL sales $ 706,651 $ 197,153 $ 171,865 $ $ 1,075,669
(Loss) gain on oil and natural gas derivatives 39,639 676 40,315
Midstream revenue 18,958 11,366 30,324
Product sales 22,599 22,599
Gas off-take agreement amortization 14,654 (14,654 ) (a)
Other revenues 337 337
Total revenues 787,847 224,186 171,865 (14,654 ) 1,169,244
Operating expenses
Gathering and processing 93,116 38,094 131,210
Lease operating expense 157,317 78,361 66,700 302,378
Production taxes 33,643 17,937 13,501 65,081
Midstream operating expense 10,275 10,275
Cost of product sales 20,308 20,308
Depreciation, depletion, amortization and accretion – oil and natural gas 188,356 63,031 18,967 (b) 270,354
Depreciation and amortization – other 7,905 1,382 2,888 (c) 12,175
General and administrative 37,178 27,507 (13,204 ) (g) 51,481
General and administrative – related party 5,550 5,550
Impairment of oil and gas properties 90,430 90,430
Total operating expenses 644,078 226,312 80,201 8,651 959,242
Income (loss) from operations 143,769 (2,126 ) 91,664 (23,305 ) 210,002
Other (expense) income
Interest expense (46,953 ) (13,642 ) (22,809 ) (d) (83,404 )
Loss on debt extinguishment (18,540 ) (18,540 )
Other income (expense), net (8,383 ) 25 (8,358 )
Total other expense (73,876 ) (13,617 ) (22,809 ) (110,302 )
Net income (loss) $ 69,893 $ (15,743 ) $ 91,664 $ (46,114 ) $ 99,700
Net income per common unit:
Basic $ 0.59 $ (f) $ 0.59
Diluted $ 0.59 $ (f) $ 0.59
Weighted average common units outstanding:
Basic 119,025 49,799 (e) 168,824
Diluted 119,141 49,799 (e) 168,940

The accompanying notes are an integral partof these unaudited pro forma condensed combined financial statements.

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MACH NATURAL RESOURCES LP

NOTES TO UNAUDITED PRO FORMA CONDENSEDCOMBINED FINANCIAL STATEMENTS


Note 1 – Basis of Pro Forma Presentation

The historical financial information included herein is derived from the financial statements of the Company, the IKAV Companies and Sabinal. For purposes of the pro forma statements of operations, it is assumed that each of the Transactions took place on January 1, 2024.

The pro forma financial statements reflect i) the consummation of the IKAV Acquisition pursuant to the terms of the IKAV MIPA, ii) the consummation of the Sabinal Acquisition pursuant to the terms of the Sabinal PSA and iii) the entrance in the First Amendment to the Company’s credit agreement.

In conjunction with the closing of the Transactions, the First Amendment to the Company’s credit agreement provided for an increase to the in the borrowing base of $700.0 million and established an aggregate term loan commitment amount of $450.0 million, which was fully funded in connection with the closing of the Transactions. The Company’s term loan bears interest at a rate equal to Term SOFR plus a margin of 4.00% per annum.

The pro forma financial statements reflect pro forma adjustments that are based on available information and certain assumptions that management believes are reasonable. However, actual results may differ from those reflected in these statements. In management’s opinion, all adjustments known to date that are necessary to fairly present the pro forma information have been made. The pro forma financial statements do not purport to represent what the combined entity’s results of operations would have been if the Transactions had actually occurred on January 1, 2024, nor are they indicative of the Company’s future results of operations.

These pro forma financial statements should be read in conjunction with the historical financial statements for the three and nine months ended September 30, 2025 and for the year ended December 31, 2024 included in the Company’s Quarterly Report on Form 10-Q and Annual Report on Form 10-K, respectively, as well as the historical financial statements of the IKAV Companies and Sabinal included in previous 8-K filings.


Note 2 – Purchase Price Allocations

The IKAV Acquisition was accounted for as a business combination, under the acquisition method, as the Company is obtaining control of a business by obtaining the legal right to use and develop the oil and natural gas properties included in the IKAV MIPA, as well as additional oil and gas related assets that can be used to enhance the value of the business. The allocation of the purchase price for the IKAV Acquisition was based upon management’s estimates of and assumptions related to the fair value of assets acquired and liabilities assumed using available information.

The table below reflects the fair value estimates of the assets acquired and liabilities assumed as of the acquisition date. Below is a reconciliation of the assets acquired and liabilities assumed (in thousands, except unit data):

IKAV<br> Acquisition
Consideration transferred:
Common units issued 30,611,264
Closing price of common units on September 15, 2025 $ 13.39
Equity consideration $ 409,885
Cash consideration 349,763
Total acquisition consideration $ 759,648
Assets acquired:
Proved oil and natural gas properties $ 736,390
Accounts receivable 66,232
Short-term derivative assets 5,470
Inventories 18,141
Other current assets 15,319
Other property, plant and equipment 113,867
Other assets 11,430
Total assets acquired 966,849
Liabilities assumed:
Outstanding checks in excess of bank balance 1,574
Accounts payable and accrued liabilities 90,679
Revenue payable 14,519
Other current liabilities 331
Asset retirement obligations 86,948
Long-term derivative liabilities 2,187
Other long-term liabilities 10,963
Total liabilities assumed 207,201
Net assets acquired $ 759,648
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The Sabinal Acquisition was accounted for as an asset acquisition as substantially all of the gross fair value of the Sabinal Assets was concentrated in proved oil and natural gas properties, which were considered to be a group of similar identifiable assets. The allocation of the purchase price for the Sabinal Acquisition was based upon management’s estimates of and assumptions related to the fair value of assets acquired and liabilities assumed using available information.

The table below reflects the fair value estimates of the assets acquired and liabilities assumed as of the acquisition date. Below is a reconciliation of the assets acquired and liabilities assumed (in thousands, except unit data):

Sabinal<br> Acquisition
Consideration transferred:
Common units issued 19,187,581
Closing price of common units on September 15, 2025 $ 13.39
Equity consideration $ 256,922
Cash consideration 195,711
Capitalized transaction costs 3,589
Less: purchase price adjustment receivable (11,780 )
Total acquisition consideration $ 444,442
Assets acquired:
Proved oil and natural gas properties $ 489,681
Inventories 6,123
Other assets 144
Short-term derivative assets 5,793
Long-term derivative assets 3,933
Total assets acquired 505,674
Liabilities assumed:
Accrued liabilities 2,876
Revenue payable 1,336
Asset retirement obligations 57,020
Total liabilities assumed 61,232
Net assets acquired $ 444,442

Note 3 – Pro Forma Adjustments and Assumptions

The pro forma financial statements have been prepared to illustrate the effect of the Transactions and have been prepared for informational purposes only.

The preceding pro forma financial statements have been prepared in accordance with Article 11 of Regulation S-X as amended by the final rule, Release No. 33-10786 “Amendments to Financial Disclosures about Acquired and Disposed Businesses.” Release No. 33-10786 replaced the previous pro forma adjustment criteria with simplified requirements to depict the accounting for the Transactions (“Transaction Accounting Adjustments”) and allows for supplemental disclosure of the reasonably estimable synergies and other transaction effects that have occurred or are reasonably expected to occur (“Management Adjustments”). Management has elected not to disclose Management Adjustments.

The Company made the following adjustments and assumptions in preparation of the pro forma statements of operations:

a) Adjustment reflects elimination of the amortization as a result<br>of removing the gas off-take liability as it is now included within the preliminary fair value of oil and gas properties.
b) Adjustments reflect changes to depreciation, depletion and amortization<br>expense that would have been incurred as a result of the preliminary fair value of acquired oil and natural gas properties under the<br>full cost method of accounting.
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c) Adjustments reflect changes to depreciation and amortization<br>of other assets that would have been incurred based on the preliminary fair value of acquired other property and equipment.
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d) Adjustments reflect the elimination of interest expense for the<br>IKAV Companies and Sabinal and the additional interest expense related to the Company’s amended credit facility. The increase to<br>the Company’s credit facility is made up of a $450.0 million term loan bearing interest at 8.2% and a $99.1 million increase to<br>its revolver bearing interest at 7.9%. The impact on interest expense of a 1% (or 100 basis points) increase or decrease in the assumed<br>weighted average interest rate on our increase in variable interest debt would be approximately $5.5 million per year.
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e) Adjustments reflect the common units issued as consideration<br>transferred for the Transactions on a pro forma basis assuming the common units issued on September 16, 2025 were outstanding from January<br>1, 2024.
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f) Adjustments reflect the pro forma impact of the Transactions,<br>including the issuance of additional common units of the Company, on the calculation of net income per common unit.
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g) Adjustment reflects the removal of expense for transaction costs<br>associated with the acquisitions that would’ve occurred during 2024.
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Note 4 –Historical Financial Statements of the IKAV Companies

The following table presents pro forma adjustments to the historical financial statements of the IKAV Companies. Certain reclassification adjustments were made to the financial statement presentation of the IKAV Companies in order to conform with the Company’s financial statement presentation.

The historical statements of operations for the IKAV Companies for the nine months ended September 30, 2025 and related adjustments are presented below (in thousands):

SIMCOE LLC<br> <br>(Historical)^1^ SJ INVESTMENT OPPS LLC<br> <br>(Historical)^1^ SIMCOE LLC<br> <br>(Historical)^2^ SJ INVESTMENT OPPS LLC<br> <br>(Historical)^2^ Reclassification Adjustments IKAV Companies <br> As Adjusted
Revenue
Oil, gas and plant products $ 120,219 $ $ 54,074 $ $ (174,293 ) $
Natural gas 16,287 6,573 (22,860 )
Oil, natural gas, and NGL sales 197,153 197,153
Gain on oil and natural gas derivatives 676 676
Midstream revenue 6,976 4,103 287 11,366
Gas off-take agreement amortization 10,466 4,188 14,654
Saltwater disposal revenues 220 67 (287 )
Rental revenue 87 48 (135 )
Other revenues 202 135 337
Total revenues 138,170 16,287 62,480 6,573 676 224,186
Operating expenses
Gathering and processing 21,394 4,489 10,508 1,703 38,094
Workover 6,647 158 4,410 184 (11,399 )
Lease operating expense 42,482 2,202 21,077 1,201 11,399 78,361
Production taxes 10,100 1,663 5,355 819 17,937
Midstream operating expense
Accretion expense 2,674 9 900 4 (3,587 )
Depreciation, depletion and amortization 37,715 7,119 13,709 2,283 (60,826 )
Depreciation, depletion, amortization and accretion – oil and natural gas 63,031 63,031
Depreciation and amortization – other 1,382 1,382
General and administrative 2,097 448 10,592 1,548 12,822 27,507
General and administrative – related party 10,362 2,460 (12,822 )
Total operating expenses 133,471 18,548 66,551 7,742 226,312
Income (loss) from operations 4,699 (2,261 ) (4,071 ) (1,169 ) 676 (2,126 )
Other (expense) income
Interest expense (5,688 ) (2,838 ) (3,794 ) (1,322 ) (13,642 )
Foreign currency gain 27 (2 ) (25 )
(Loss) gain on derivatives, net (494 ) (6,371 ) 2,992 4,549 (676 )
Other income (expense), net 25 25
Total other expense (6,155 ) (9,209 ) (804 ) 3,227 (676 ) (13,617 )
Net loss $ (1,456 ) $ (11,470 ) $ (4,875 ) $ 2,058 $ $ (15,743 )
^1^ Reflects the historical operations of the IKAV Companies for the six months ended June 30, 2025.
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^2^ Reflects the historical operations of the IKAV Companies for the period from July 1, 2025 through September 16, 2025, t/he date the IKAV Acquisition was closed.

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Note 5 –Historical Financial Statements of Sabinal

The following table presents pro forma adjustments to the historical financial statements of Sabinal. In addition to carve-out adjustments for certain oil and natural gas properties and activities that were not acquired from Sabinal as part of the Sabinal Acquisition, certain reclassification adjustments were made to the financial statement presentation of Sabinal in order to conform with the Company’s financial statement presentation.

The Company made adjustments to Sabinal’s historical statements of operations for the nine months ended September 30, 2025 as shown below in (a) to reflect the carve-out of revenues and operating expenses for certain oil and natural gas properties that were not acquired from Sabinal as part of the Sabinal Acquisition. The historical statement of operations for Sabinal for the nine months ended September 30, 2025 and related adjustments are presented below (in thousands):

Sabinal Energy Operating, LLC<br> <br>(Historical)^1^ Sabinal Assets<br><br>Carve-out Adjustments (a) Sabinal Energy Operating, LLC<br> <br>(Historical)^2^ Reclassification Adjustments Sabinal Assets<br> As Adjusted
Revenue
Oil sales $ 132,463 $ (11,258 ) $ 47,992 $ (169,197 ) $
Natural gas sales 493 (218 ) 79 (354 )
Natural gas liquids sales 2,038 (245 ) 521 (2,314 )
Oil, natural gas, and NGL sales 171,865 171,865
Total revenues 134,994 (11,721 ) 48,592 171,865
Operating expenses
Workover expenses 10,761 (156 ) 5,745 (16,350 )
Lease operating expense 33,898 (935 ) 17,387 16,350 66,700
Production taxes 12,050 (823 ) 2,274 13,501
Accretion expense 2,706 (2,706 )
Depreciation, depletion and amortization 26,516 (26,516 )
Exploration and abandonment expense 437 (437 )
General and administrative 7,461 (7,461 )
Total operating expenses 93,829 (39,034 ) 25,406 80,201
Income from operations 41,165 27,313 23,186 91,664
Other (expense) income
Interest expense (8,374 ) 8,374
Gain on derivatives, net 17,851 (17,851 )
Other income (expense), net 3,374 (3,374 )
Total other expense 12,851 (12,851 )
Income before taxes 54,016 14,462 23,186 91,664
Tax expense 400 (400 )
Net income $ 53,616 $ 14,862 $ 23,186 $ $ 91,664
^1^ Reflects the historical operations of Sabinal for the six months ended June 30, 2025.
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^2^ Reflects the revenues and direct operating expenses of the acquired Sabinal Assets for the period from July 1, 2025 through September 16, 2025, the date the Sabinal Acquisition was closed. Historical information for Sabinal is not available for this stub period.
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