Mammoth Energy ServicesTUSK
13F holders, Q1 2026 (March 31)90holders +18
28new positions
13sold out
3famous investors
$2.45avg. 13F price*
At the end of Q1 2026, 90 institutions reported holding Mammoth Energy Services Inc. (TUSK) in their 13F filings, up 18 from Q4 2025. 28 opened new positions and 13 sold out. The largest holders were Wexford Capital LP ($54.1M), Adage Capital Partners Gp, L.L.C. ($11.2M) and BlackRock, Inc. ($3.6M). 3 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 Cliff Asness (0.0% of AQR Capital Management's portfolio).
- Company
- Mammoth Energy Services Inc.
- CUSIP
- 56155L108
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 28 | $2.8M |
| Exits | 13 | $834K |
All 13F filers, Q4 2025 → Q1 2026: 1,768,718 shares bought and 1,189,190 shares sold, net +579,528 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 90 holders
| Wexford Capital LP | 8.91% | Reduce -0.1% | 22,068,212 | $54.1M |
| Adage Capital Partners Gp, L.L.C. | 0.02% | No change | 4,575,000 | $11.2M |
| BlackRock, Inc. | 0.00% | Reduce -1.2% | 1,454,839 | $3.6M |
| Vanguard Capital Management LLC | 0.00% | — | 819,120 | $2.0M |
| Dimensional Fund Advisors LP | 0.00% | Reduce -1.9% | 686,199 | $1.7M |
| Peapod Lane Capital LLC | 1.24% | New | 599,805 | $1.5M |
| Geode Capital Management, LLC | 0.00% | Add +4.3% | 610,926 | $1.5M |
| State Street Corp. | 0.00% | Add +3.3% | 421,922 | $1.0M |
| Bridgeway Capital Management, LLC | 0.02% | Reduce -18.9% | 332,313 | $814K |
| Citadel Advisors | 0.00% | Add +50.5% | 331,367 | $812K |
| Empowered Funds, LLC | 0.00% | Add +10.2% | 241,313 | $591K |
| Renaissance Technologies | 0.00% | Add +24.7% | 231,972 | $568K |
| Goldman Sachs Group Inc. | 0.00% | Add +148.5% | 223,489 | $548K |
| Acadian Asset Management LLC | 0.00% | Add +91.0% | 204,105 | $498K |
| Northern Trust Corp. | 0.00% | Add +11.5% | 187,128 | $458K |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 170,131 | $417K |
| Los Angeles Capital Management LLC | 0.00% | New | 163,259 | $400K |
| Boston Partners | 0.00% | New | 154,388 | $378K |
| Morgan Stanley | 0.00% | Reduce -47.8% | 152,723 | $374K |
| Vanguard Portfolio Management LLC | 0.00% | — | 140,145 | $343K |
| Bank of New York Mellon Corp | 0.00% | Reduce -0.1% | 132,539 | $325K |
| Centiva Capital, LP | 0.01% | Add +168.9% | 111,108 | $272K |
| Stifel Financial Corp. | 0.00% | No change | 105,572 | $259K |
| Osaic Holdings, Inc. | 0.00% | Reduce -9.1% | 72,419 | $177K |
| Wellington Management Group LLP | 0.00% | Add +21.3% | 68,415 | $168K |
| Russell Investments Group, Ltd. | 0.00% | Reduce -72.5% | 68,030 | $167K |
| AQR Capital Management | 0.00% | Add +492.9% | 66,731 | $163K |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -16.7% | 58,861 | $144K |
| Squarepoint Ops LLC | 0.00% | Reduce -32.2% | 51,620 | $126K |
| Nuveen, LLC | 0.00% | No change | 36,843 | $90K |
| Susquehanna International Group, LLP | 0.00% | Add +253.7% | 36,299 | $89K |
| Occudo Quantitative Strategies LP | 0.00% | New | 29,336 | $84K |
| Rhumbline Advisers | 0.00% | Add +0.7% | 32,863 | $81K |
| Mariner, LLC | 0.00% | New | 26,873 | $66K |
| Bank of America Corp. | 0.00% | Add +15.9% | 25,589 | $63K |
| Levin Capital Strategies, L.P. | 0.00% | New | 25,000 | $61K |
| Jane Street Group, LLC | 0.00% | Reduce -42.4% | 22,854 | $56K |
| Verdad Advisers, LP | 0.06% | New | 22,729 | $56K |
| Steinberganna Wealth Management | 0.02% | Add +34.9% | 18,360 | $45K |
| Schonfeld Strategic Advisors LLC | 0.00% | New | 18,325 | $45K |
| Creative Planning | 0.00% | Add +40.0% | 16,950 | $42K |
| BNP Paribas Financial Markets | 0.00% | Reduce -1.6% | 16,747 | $41K |
| Sanctuary Advisors, LLC | 0.00% | New | 16,676 | $41K |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | New | 14,510 | $36K |
| Gsa Capital Partners LLP | 0.00% | New | 13,909 | $34K |
| Sei Investments Co. | 0.00% | New | 13,579 | $33K |
| T. Rowe Price Associates Inc. | 0.00% | No change | 13,385 | $33K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Add +2.2% | 12,570 | $31K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +125.6% | 12,522 | $31K |
| FMR LLC | 0.00% | Add +9.3% | 12,142 | $30K |
| Archer Investment Corp | 0.01% | No change | 11,200 | $27K |
| JPMorgan Chase & Co. | 0.00% | Reduce -93.8% | 10,275 | $27K |
| Valueworks LLC | 0.01% | Reduce -16.1% | 10,720 | $26K |
| New York State Common Retirement Fund | 0.00% | No change | 10,696 | $26K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | No change | 9,637 | $24K |
| Wells Fargo & Company | 0.00% | Reduce -65.6% | 9,469 | $23K |
| Vanguard Global Advisers, LLC | 0.00% | — | 8,774 | $21K |
| Alliancebernstein L.P. | 0.00% | Reduce -3.9% | 10,950 | $20K |
| UBS Group AG | 0.00% | Reduce -56.5% | 7,667 | $19K |
| Cwm, LLC | 0.00% | Add +2086.0% | 5,793 | $14K |
| PNC Financial Services Group, Inc. | 0.00% | Add +57.9% | 5,720 | $14K |
| Barclays PLC | 0.00% | Reduce -85.3% | 5,581 | $14K |
| Simplex Trading, LLC | 0.00% | New | 5,538 | $14K |
| Legal & General Group Plc | 0.00% | No change | 2,179 | $5K |
| Ameritas Investment Partners, Inc. | 0.00% | No change | 1,924 | $5K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | New | 1,416 | $3K |
| Citigroup Inc. | 0.00% | Add +105.3% | 1,127 | $3K |
| Sterling Capital Management LLC | 0.00% | Reduce -52.0% | 803 | $2K |
| Allianz SE | 0.00% | New | 800 | $2K |
| Advisory Services Network, LLC | 0.00% | New | 500 | $1K |
| Allworth Financial LP | 0.00% | New | 202 | $495 |
| Optiver Holding B.V. | 0.00% | Reduce -39.0% | 200 | $490 |
| Westside Investment Management, Inc. | 0.00% | No change | 187 | $458 |
| MAI Capital Management | 0.00% | New | 168 | $412 |
| Rothschild Investment LLC | 0.00% | New | 133 | $326 |
| SBI Securities Co., Ltd. | 0.00% | Reduce -15.8% | 101 | $247 |
| EverSource Wealth Advisors, LLC | 0.00% | Add +950.0% | 84 | $205 |
| Basecamp Wealth Advisors LLC | 0.00% | New | 57 | $140 |
| Root Financial Partners, LLC | 0.00% | New | 32 | $78 |
| Transamerica Financial Advisors, LLC | 0.00% | No change | 31 | $75 |
| True Wealth Design, LLC | 0.00% | Add +525.0% | 25 | $62 |
| Essential Partners LLC | 0.00% | New | 20 | $49 |
| Arax Advisory Partners | 0.00% | New | 17 | $42 |
| SJS Investment Consulting Inc. | 0.00% | New | 17 | $42 |
| Wealth Preservation Advisors, LLC | 0.00% | New | 15 | $37 |
| Farther Finance Advisors, LLC | 0.00% | New | 14 | $33 |
| JPL Wealth Management, LLC | 0.00% | New | 9 | $23 |
| IFP Advisors, Inc | 0.00% | Reduce -83.9% | 5 | $12 |
| Caitong International Asset Management Co., Ltd | 0.00% | New | 2 | $5 |
| Royal Bank of Canada | 0.00% | Reduce -99.9% | 1 | $0 |
"% of holder's portfolio" is TUSK's weight in each manager's 13F, not the share of Mammoth Energy Services Inc. the manager owns.