Mammoth Energy ServicesTUSK
13F holders, Q2 2026 (June 30)93holders +3
27new positions
23sold out
5famous investors
$3.25avg. 13F price*
At the end of Q2 2026, 93 institutions reported holding Mammoth Energy Services Inc. (TUSK) in their 13F filings, up 3 from Q1 2026. 27 opened new positions and 23 sold out. The largest holders were Wexford Capital LP ($39.2M), Adage Capital Partners Gp, L.L.C. ($14.9M) and Vanguard Capital Management LLC ($3.4M). 5 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Ken Griffin (0.0% of Citadel Advisors's portfolio) and Steve Cohen (0.0% of Point72 Asset Management's portfolio).
- Company
- Mammoth Energy Services Inc.
- CUSIP
- 56155L108
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 27 | $7.0M |
| Exits | 23 | $1.4M |
All 13F filers, Q1 2026 → Q2 2026: 4,014,152 shares bought and 13,003,756 shares sold, net −8,989,604 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 93 holders
| Wexford Capital LP | 5.38% | Reduce -45.3% | 12,071,823 | $39.2M |
| Adage Capital Partners Gp, L.L.C. | 0.02% | No change | 4,575,000 | $14.9M |
| Vanguard Capital Management LLC | 0.00% | Add +29.4% | 1,059,603 | $3.4M |
| Peapod Lane Capital LLC | 1.77% | Add +34.7% | 807,804 | $2.6M |
| Dimensional Fund Advisors LP | 0.00% | Add +0.8% | 691,667 | $2.2M |
| Jane Street Group, LLC | 0.00% | Add +2116.9% | 506,662 | $1.6M |
| Citadel Advisors | 0.00% | Add +36.5% | 452,163 | $1.5M |
| BlackRock, Inc. | 0.00% | Reduce -72.0% | 407,976 | $1.3M |
| Marshall Wace, LLP | 0.00% | New | 395,583 | $1.3M |
| Johns Hopkins University | 0.08% | New | 387,359 | $1.3M |
| Bridgeway Capital Management, LLC | 0.02% | No change | 332,313 | $1.1M |
| Russell Investments Group, Ltd. | 0.00% | Add +384.8% | 329,821 | $1.1M |
| Geode Capital Management, LLC | 0.00% | Reduce -49.9% | 306,028 | $996K |
| Renaissance Technologies | 0.00% | Add +26.0% | 292,280 | $950K |
| Arrowstreet Capital, Limited Partnership | 0.00% | New | 290,096 | $943K |
| Empowered Funds, LLC | 0.00% | No change | 241,313 | $784K |
| AQR Capital Management | 0.00% | Add +166.5% | 177,824 | $578K |
| Vanguard Fiduciary Trust Co. | 0.00% | Reduce -4.9% | 161,791 | $526K |
| Round Rock Advisors LLC | 0.06% | New | 152,841 | $497K |
| Morgan Stanley | 0.00% | Reduce -12.6% | 133,560 | $434K |
| Centiva Capital, LP | 0.01% | Add +17.8% | 130,870 | $425K |
| Gsa Capital Partners LLP | 0.03% | Add +831.4% | 129,547 | $421K |
| Millennium Management | 0.00% | New | 124,186 | $404K |
| Acadian Asset Management LLC | 0.00% | Reduce -40.2% | 122,050 | $396K |
| Marquette Asset Management, LLC | 0.05% | New | 109,826 | $357K |
| Stifel Financial Corp. | 0.00% | No change | 105,572 | $343K |
| State Street Corp. | 0.00% | Reduce -75.9% | 101,864 | $331K |
| Bank of America Corp. | 0.00% | Add +279.3% | 97,046 | $315K |
| BNP Paribas Financial Markets | 0.00% | Add +455.1% | 92,964 | $302K |
| FNY Investment Advisers, LLC | 0.09% | New | 76,481 | $248K |
| Point72 Asset Management | 0.00% | New | 72,091 | $234K |
| Boston Partners | 0.00% | Reduce -55.4% | 68,935 | $224K |
| Aster Capital Management (DIFC) Ltd | 0.05% | New | 67,570 | $220K |
| Bank of New York Mellon Corp | 0.00% | Reduce -53.2% | 62,007 | $202K |
| Qube Research & Technologies Ltd | 0.00% | New | 58,859 | $191K |
| Two Sigma Investments, LP | 0.00% | New | 58,538 | $190K |
| Northern Trust Corp. | 0.00% | Reduce -69.4% | 57,180 | $186K |
| Goldman Sachs Group Inc. | 0.00% | Reduce -75.4% | 54,928 | $179K |
| Susquehanna International Group, LLP | 0.00% | Add +37.5% | 49,920 | $162K |
| XTX Topco Ltd | 0.00% | New | 49,261 | $160K |
| Walleye Capital LLC | 0.00% | New | 49,141 | $160K |
| Wellington Management Group LLP | 0.00% | Reduce -30.6% | 47,486 | $154K |
| Algert Global LLC | 0.00% | New | 45,997 | $149K |
| Quadrature Capital Ltd | 0.00% | New | 44,015 | $143K |
| HSBC Holdings PLC | 0.00% | New | 33,706 | $108K |
| HRT Financial LP | 0.00% | New | 30,632 | $99K |
| UBS Group AG | 0.00% | Add +285.0% | 29,518 | $96K |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | Add +97.0% | 28,581 | $93K |
| Captrust Financial Advisors | 0.00% | New | 26,799 | $87K |
| Barclays PLC | 0.00% | Add +357.9% | 25,553 | $83K |
| Ieq Capital, LLC | 0.00% | New | 24,392 | $79K |
| Pathstone Holdings, LLC | 0.00% | New | 22,336 | $73K |
| Schonfeld Strategic Advisors LLC | 0.00% | Reduce -8.0% | 16,864 | $55K |
| Rhumbline Advisers | 0.00% | Reduce -49.5% | 16,609 | $54K |
| Axq Capital, LP | 0.00% | New | 13,903 | $45K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +7.6% | 13,477 | $44K |
| Creative Planning | 0.00% | Reduce -21.4% | 13,317 | $43K |
| Mariner, LLC | 0.00% | Reduce -50.6% | 13,287 | $43K |
| Virtu Financial LLC | 0.00% | New | 12,793 | $42K |
| FMR LLC | 0.00% | Add +3.2% | 12,531 | $41K |
| Steinberganna Wealth Management | 0.02% | Reduce -37.0% | 11,560 | $38K |
| JPMorgan Chase & Co. | 0.00% | Add +20.5% | 12,385 | $36K |
| Prelude Capital Management, LLC | 0.00% | New | 10,800 | $35K |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -81.8% | 10,739 | $35K |
| Vanguard Global Advisers, LLC | 0.00% | No change | 8,774 | $29K |
| Archer Investment Corp | 0.01% | Reduce -26.8% | 8,200 | $27K |
| PNC Financial Services Group, Inc. | 0.00% | Add +26.2% | 7,217 | $23K |
| Royal Bank of Canada | 0.00% | Add +453600.0% | 4,537 | $14K |
| Simplex Trading, LLC | 0.00% | Reduce -37.6% | 3,457 | $11K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | No change | 1,416 | $5K |
| Arax Advisory Partners | 0.00% | Add +4858.8% | 843 | $3K |
| Allworth Financial LP | 0.00% | Add +315.8% | 840 | $3K |
| Allianz SE | 0.00% | No change | 800 | $3K |
| Group One Trading LLC | 0.00% | New | 777 | $3K |
| Wells Fargo & Company | 0.00% | Reduce -96.8% | 300 | $975 |
| EverSource Wealth Advisors, LLC | 0.00% | Add +228.6% | 276 | $898 |
| Rothschild Investment LLC | 0.00% | Add +79.7% | 239 | $777 |
| Essential Partners LLC | 0.00% | Add +960.0% | 212 | $689 |
| McGuire Capital Advisors Inc. | 0.00% | New | 200 | $650 |
| Westside Investment Management, Inc. | 0.00% | No change | 187 | $608 |
| Osaic Holdings, Inc. | 0.00% | Reduce -99.8% | 150 | $487 |
| Farther Finance Advisors, LLC | 0.00% | Add +664.3% | 107 | $343 |
| Basecamp Wealth Advisors LLC | 0.00% | Add +38.6% | 79 | $257 |
| True Wealth Design, LLC | 0.00% | Add +48.0% | 37 | $121 |
| Transamerica Financial Advisors, LLC | 0.00% | No change | 31 | $100 |
| SJS Investment Consulting Inc. | 0.00% | Add +76.5% | 30 | $98 |
| IFP Advisors, Inc | 0.00% | Add +440.0% | 27 | $88 |
| Wealth Enhancement Trust Services, Inc. | 0.00% | New | 17 | $55 |
| Caitong International Asset Management Co., Ltd | 0.00% | Add +400.0% | 10 | $32 |
| JPL Wealth Management, LLC | 0.00% | No change | 9 | $30 |
| Fortitude Family Office, LLC | 0.00% | New | 7 | $23 |
| Citigroup Inc. | 0.00% | Reduce -99.9% | 1 | $3 |
| SBI Securities Co., Ltd. | 0.00% | Reduce -99.0% | 1 | $3 |
"% of holder's portfolio" is TUSK's weight in each manager's 13F, not the share of Mammoth Energy Services Inc. the manager owns.