MNTK
Montauk Renewables, Inc.
$1.69
+0.06 (+3.68%)
At close · Jul 2
Market Cap
$240.56M
Shares
142,341,139
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 93
Total Value: $23,483,137
Total Shares: 20,420,173
Institutional Ownership Trend
21 quarters
Holder Concentration
Across 93 13F filers · Δ vs Dec 31, 2025Top Holder
20.7%
−1.1 pts
Top 5
57.0%
−6.2 pts
Top 10
75.4%
−3.8 pts
HHI
881
Broadly held−171
Quarterly Activity
vs Dec 31, 2025
New
20
Increased
29
Decreased
30
Sold Out
10
Unchanged
14
Holder count:
+10
Institutional value:
-29.3%
Shares held:
+2.6%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega BARCLAYS PLC | +929,541 | 1,038,917 | |
| Mega MILLENNIUM MANAGEMENT LLC | +181,204 | 206,854 | |
| Mega GOLDMAN SACHS GROUP INC | +135,157 | 331,189 | |
| Mid GSA CAPITAL PARTNERS LLP | +47,248 | 289,894 | |
| Large ACADIAN ASSET MANAGEMENT LLC | +44,174 | 56,106 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega BlackRock, Inc. | −105,289 | 4,218,997 | |
| Mega DIMENSIONAL FUND ADVISORS LP | −95,950 | 736,584 | |
| Mega JANE STREET GROUP, LLC | −95,111 | 35,576 | |
| Mega D. E. Shaw & Co., Inc. | −74,092 | 118,256 | |
| Mega MORGAN STANLEY | −67,264 | 261,398 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 2,688,714 | $3,092,021 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 432,268 | $497,108 | |
| Large MARSHALL WACE, LLP | 204,636 | $235,331 | |
| Small J. Derek Lewis & Associates Inc. | 85,000 | $97,750 | |
| Large Squarepoint Ops LLC | 35,893 | $41,276 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD GROUP INC | 3,528,926 | $5,893,305 | |
| Mega CITADEL ADVISORS LLC | 200,021 | $334,034 | |
| Micro Andina Capital Management, LLC | 41,572 | $69,425 | |
| Small R Squared Ltd | 28,945 | $48,338 | |
| Large HRT FINANCIAL LP | 26,353 | $44,009 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. | $4,851,844 | 20.66% | 4,218,997 | Shares | Sole | 2026-05-13 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $3,092,021 | 13.17% | 2,688,714 | Shares | Defined | 2026-05-15 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $2,023,169 | 8.62% | 1,759,278 | Shares | Defined | 2026-05-15 | ||||
| Mid Baader Bank Aktiengesellschaft Bank | $1,845,750 | 7.86% | 1,605,000 | Shares | Sole | 2026-05-08 | ||||
| Mega STATE STREET CORP | $1,570,293 | 6.69% | 1,365,473 | Shares | Defined | 2026-05-15 | ||||
| Mega BARCLAYS PLC | $1,194,753 | 5.09% | 1,038,917 | Shares | Defined | 2026-05-15 | ||||
| Mega AMERICAN CENTURY COMPANIES INC | $1,097,638 | 4.67% | 954,468 | Shares | Defined | 2026-05-15 | ||||
| Mega DIMENSIONAL FUND ADVISORS LP | $847,069 | 3.61% | 736,584 | Shares | Sole | 2026-05-07 | ||||
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $598,702 | 2.55% | 520,611 | Shares | Sole | 2026-05-15 | ||||
| Mega NORTHERN TRUST CORP Bank | $581,179 | 2.47% | 505,374 | Shares | Defined | 2026-05-14 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $497,108 | 2.12% | 432,268 | Shares | Defined | 2026-05-08 | ||||
| Mid Hosking Partners LLP | $456,471 | 1.94% | 396,932 | Shares | Sole | 2026-04-21 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $407,790 | 1.74% | 354,600 | Shares | Sole | 2026-05-14 | ||||
| Mega GOLDMAN SACHS GROUP INC | $380,866 | 1.62% | 331,189 | Shares | Defined | 2026-05-15 | ||||
| Mega FIRST TRUST ADVISORS LP | $358,742 | 1.53% | 311,950 | Shares | Sole | 2026-05-13 | ||||
| Mid GSA CAPITAL PARTNERS LLP | $333,378 | 1.42% | 289,894 | Shares | Sole | 2026-05-08 | ||||
| Mega MORGAN STANLEY | $300,605 | 1.28% | 261,398 | Shares | Defined | 2026-05-15 | ||||
| Mega MILLENNIUM MANAGEMENT LLC | $237,882 | 1.01% | 206,854 | Shares | Sole | 2026-05-15 | ||||
| Large MARSHALL WACE, LLP | $235,331 | 1.00% | 204,636 | Shares | Other | 2026-05-15 | ||||
| Mid JTC Employer Solutions Trustee Ltd | $227,537 | 0.97% | 197,859 | Shares | Sole | 2026-05-19 | ||||
| Mega Bank of New York Mellon Corp Bank | $225,292 | 0.96% | 195,907 | Shares | Defined | 2026-05-05 | ||||
| Mega JPMORGAN CHASE & CO | $186,589 | 0.79% | 162,252 | Shares | Defined | 2026-05-13 | ||||
| Mega Nuveen, LLC | $160,548 | 0.68% | 139,608 | Shares | Defined | 2026-04-30 | ||||
| Mega D. E. Shaw & Co., Inc. | $135,994 | 0.58% | 118,256 | Shares | Defined | 2026-05-15 | ||||
| Large Rathbones Group PLC | $117,300 | 0.50% | 102,000 | Shares | Sole | 2026-05-12 | ||||
| Mega ALLIANCEBERNSTEIN L.P. | $112,148 | 0.48% | 97,520 | Shares | Defined | 2026-05-15 | ||||
| Mega RHUMBLINE ADVISERS | $107,039 | 0.46% | 93,078 | Shares | Sole | 2026-05-12 | ||||
| Small J. Derek Lewis & Associates Inc. | $97,750 | 0.42% | 85,000 | Shares | Sole | 2026-05-21 | ||||
| Large STOREBRAND ASSET MANAGEMENT AS | $94,501 | 0.40% | 82,175 | Shares | Sole | 2026-05-05 | ||||
| Mega BANK OF AMERICA CORP /DE/ Bank | $69,813 | 0.30% | 60,707 | Shares | Defined | 2026-05-18 | ||||
| Large ACADIAN ASSET MANAGEMENT LLC | $64,521 | 0.27% | 56,106 | Shares | Defined | 2026-05-13 | ||||
| Mega DEUTSCHE BANK AG\ Bank | $54,057 | 0.23% | 47,007 | Shares | Defined | 2026-05-06 | ||||
| Mega UBS Group AG | $48,147 | 0.21% | 41,867 | Shares | Defined | 2026-05-05 | ||||
| Large STRS OHIO | $46,000 | 0.20% | 40,000 | Shares | Sole | 2026-04-24 | ||||
| Mega AQR CAPITAL MANAGEMENT LLC | $44,100 | 0.19% | 38,351 | Shares | Defined | 2026-05-15 | ||||
| Mega Invesco Ltd. | $42,938 | 0.18% | 37,339 | Shares | Defined | 2026-05-12 | ||||
| Large Squarepoint Ops LLC | $41,276 | 0.18% | 35,893 | Shares | Defined | 2026-05-15 | ||||
| Mega JANE STREET GROUP, LLC | $40,911 | 0.17% | 35,576 | Shares | Defined | 2026-05-12 | ||||
| Mega PRICE T ROWE ASSOCIATES INC /MD/ | $38,957 | 0.17% | 33,876 | Shares | Defined | 2026-05-15 | ||||
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund | $37,825 | 0.16% | 32,892 | Shares | Defined | 2026-05-15 | ||||
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $37,131 | 0.16% | 32,288 | Shares | Defined | 2026-05-14 | ||||
| Large Russell Investments Group, Ltd. | $35,985 | 0.15% | 31,293 | Shares | Other | 2026-05-08 | ||||
| Large LOS ANGELES CAPITAL MANAGEMENT LLC | $33,585 | 0.14% | 29,205 | Shares | Sole | 2026-05-08 | ||||
| Mid Quadrature Capital Ltd | $30,967 | 0.13% | 26,928 | Shares | Other | 2026-05-15 | ||||
| Mega WELLS FARGO & COMPANY/MN | $28,996 | 0.12% | 25,214 | Shares | Defined | 2026-05-11 | ||||
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $28,169 | 0.12% | 24,495 | Shares | Other | 2026-05-15 | ||||
| Mega Vanguard Global Advisers, LLC | $27,430 | 0.12% | 23,853 | Shares | Defined | 2026-05-08 | ||||
| Micro Boyer Financial Services, Inc. | $26,438 | 0.11% | 22,990 | Shares | Sole | 2026-04-10 | ||||
| Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE Insurance | $21,812 | 0.09% | 18,967 | Shares | Defined | 2026-05-15 | ||||
| Mid Engineers Gate Manager LP | $21,422 | 0.09% | 18,628 | Shares | Sole | 2026-05-15 | ||||
| Mid INTECH INVESTMENT MANAGEMENT LLC | $20,410 | 0.09% | 17,748 | Shares | Sole | 2026-05-08 | ||||
| Mid Tower Research Capital LLC (TRC) | $19,817 | 0.08% | 17,233 | Shares | Defined | 2026-05-15 | ||||
| Mega NEUBERGER BERMAN GROUP LLC | $19,255 | 0.08% | 16,744 | Shares | Defined | 2026-05-14 | ||||
| Small TWO SIGMA SECURITIES, LLC Broker-Dealer | $18,939 | 0.08% | 16,469 | Shares | Sole | 2026-05-15 | ||||
| Large Police & Firemen's Retirement System of New Jersey Pension | $18,774 | 0.08% | 16,326 | Shares | Defined | 2026-04-29 | ||||
| Mega CITIGROUP INC | $18,147 | 0.08% | 15,781 | Shares | Defined | 2026-05-11 | ||||
| Large PRUDENTIAL FINANCIAL INC | $17,031 | 0.07% | 14,810 | Shares | Defined | 2026-05-13 | ||||
| Mega BNP PARIBAS ARBITRAGE, SA | $16,906 | 0.07% | 14,701 | Shares | Defined | 2026-05-12 | ||||
| Mid XTX Topco Ltd | $16,298 | 0.07% | 14,173 | Shares | Defined | 2026-05-15 | ||||
| Large VOYA INVESTMENT MANAGEMENT LLC | $15,748 | 0.07% | 13,694 | Shares | Defined | 2026-05-12 | ||||
| Large Tidal Investments LLC | $13,498 | 0.06% | 11,738 | Shares | Sole | 2026-05-15 | ||||
| Large Point72 Asset Management, L.P. | $12,501 | 0.05% | 10,871 | Shares | Defined | 2026-05-15 | ||||
| Small N.E.W. Advisory Services LLC | $11,500 | 0.05% | 10,000 | Shares | Sole | 2026-05-05 | ||||
| Large JONES FINANCIAL COMPANIES LLLP | $10,647 | 0.05% | 9,259 | Shares | Sole | 2026-05-15 | ||||
| Large Zurcher Kantonalbank (Zurich Cantonalbank) Bank | $9,029 | 0.04% | 7,852 | Shares | Sole | 2026-05-15 | ||||
| Mid Ameritas Investment Partners, Inc. | $7,618 | 0.03% | 6,625 | Shares | Other | 2026-05-13 | ||||
| Mega Legal & General Group Plc | $6,636 | 0.03% | 5,771 | Shares | Defined | 2026-05-08 | ||||
| Mid SIMPLEX TRADING, LLC | $5,652 | 0.02% | 4,915 | Shares | Sole | 2026-05-14 | ||||
| Large OSAIC HOLDINGS, INC. | $4,600 | 0.02% | 4,000 | Shares | Defined | 2026-05-15 | ||||
| Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension | $4,187 | 0.02% | 3,641 | Shares | Sole | 2026-05-18 | ||||
| Large NEW YORK STATE COMMON RETIREMENT FUND Pension | $3,869 | 0.02% | 3,365 | Shares | Sole | 2026-05-06 | ||||
| Mid Ninety One SA (Pty) Ltd | $3,576 | 0.02% | 3,110 | Shares | Sole | 2026-04-24 | ||||
| Mega ROYAL BANK OF CANADA Bank | $3,458 | 0.01% | 3,008 | Shares | Defined | 2026-05-15 | ||||
| Large CWM, LLC | $2,615 | 0.01% | 2,274 | Shares | Sole | 2026-05-14 | ||||
| Mid Sterling Capital Management LLC | $2,122 | 0.01% | 1,846 | Shares | Sole | 2026-04-22 | ||||
| Small TOWARZYSTWO FUNDUSZY INWESTYCYJNYCH PZU SA | $1,380 | 0.01% | 1,200 | Shares | Sole | 2026-05-15 | ||||
| Mega FMR LLC | $931 | 0.00% | 810 | Shares | Defined | 2026-05-15 | ||||
| Mid Optiver Holding B.V. | $731 | 0.00% | 636 | Shares | Defined | 2026-05-15 | ||||
| Mid GAMMA Investing LLC | $389 | 0.00% | 339 | Shares | Defined | 2026-04-06 | ||||
| Mid IFP Advisors, Inc | $216 | 0.00% | 188 | Shares | Sole | 2026-04-13 | ||||
| Small Essential Partners LLC | $215 | 0.00% | 187 | Shares | Sole | 2026-05-21 | ||||
| Mega PNC FINANCIAL SERVICES GROUP, INC. | $152 | 0.00% | 133 | Shares | Defined | 2026-05-08 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $133 | 0.00% | 116 | Shares | Defined | 2026-04-28 | ||||
| Mid Farther Finance Advisors, LLC | $94 | 0.00% | 82 | Shares | Sole | 2026-04-07 | ||||
| Mid EverSource Wealth Advisors, LLC | $78 | 0.00% | 69 | Shares | Sole | 2026-05-18 | ||||
| Small Covestor Ltd | $73 | 0.00% | 64 | Shares | Sole | 2026-05-05 | ||||
| Micro True Wealth Design, LLC | $65 | 0.00% | 57 | Shares | Sole | 2026-04-13 | ||||
| Mid ROTHSCHILD INVESTMENT LLC | $28 | 0.00% | 25 | Shares | Sole | 2026-05-07 | ||||
| Mid MAI Capital Management | $24 | 0.00% | 21 | Shares | Sole | 2026-05-15 | ||||
| Small Sunbelt Securities, Inc. Broker-Dealer | $14 | 0.00% | 13 | Shares | Sole | 2026-05-18 | ||||
| Mid Allworth Financial LP | $5 | 0.00% | 5 | Shares | Sole | 2026-05-15 | ||||
| Mid Arax Advisory Partners | $5 | 0.00% | 5 | Shares | Sole | 2026-05-13 | ||||
| Small Caitong International Asset Management Co., Ltd | $2 | 0.00% | 2 | Shares | Sole | 2026-05-11 | ||||
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