Mammoth Energy ServicesTUSK
13F holders, Q3 2025 (September 30)77holders +11
15new positions
5sold out
3famous investors
$2.29avg. 13F price*
At the end of Q3 2025, 77 institutions reported holding Mammoth Energy Services Inc. (TUSK) in their 13F filings, up 11 from Q2 2025. 15 opened new positions and 5 sold out. The largest holders were Wexford Capital LP ($50.6M), Adage Capital Partners Gp, L.L.C. ($10.5M) and Valueworks LLC ($4.7M). 3 famous investors held it, including Ken Griffin (0.0% of Citadel Advisors's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies'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 Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 15 | $384K |
| Exits | 5 | $160K |
All 13F filers, Q2 2025 → Q3 2025: 417,382 shares bought and 781,892 shares sold, net −364,510 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 77 holders
| Wexford Capital LP | 15.24% | No change | 22,096,068 | $50.6M |
| Adage Capital Partners Gp, L.L.C. | 0.02% | No change | 4,575,000 | $10.5M |
| Valueworks LLC | 1.36% | Reduce -14.7% | 2,038,205 | $4.7M |
| BlackRock, Inc. | 0.00% | Reduce -1.1% | 1,452,463 | $3.3M |
| Vanguard Group Inc. | 0.00% | Reduce -1.2% | 945,630 | $2.2M |
| Dimensional Fund Advisors LP | 0.00% | Reduce -5.8% | 936,414 | $2.1M |
| Geode Capital Management, LLC | 0.00% | Reduce -0.3% | 579,105 | $1.3M |
| State Street Corp. | 0.00% | Reduce -0.5% | 406,916 | $932K |
| Bridgeway Capital Management, LLC | 0.02% | Add +11.3% | 389,964 | $893K |
| Citadel Advisors | 0.00% | Add +83.2% | 268,315 | $614K |
| Empowered Funds, LLC | 0.00% | Add +14.1% | 198,964 | $456K |
| Northern Trust Corp. | 0.00% | Reduce -0.7% | 192,469 | $441K |
| JPMorgan Chase & Co. | 0.00% | Reduce -1.6% | 182,781 | $419K |
| CastleKnight Management LP | 0.02% | No change | 167,433 | $383K |
| Morgan Stanley | 0.00% | Reduce -21.6% | 145,300 | $333K |
| Renaissance Technologies | 0.00% | Add +1.4% | 133,972 | $307K |
| Bank of New York Mellon Corp | 0.00% | Add +1.2% | 133,755 | $306K |
| Stifel Financial Corp. | 0.00% | No change | 105,869 | $242K |
| Royal Bank of Canada | 0.00% | Reduce -3.6% | 84,135 | $193K |
| Susquehanna International Group, LLP | 0.00% | Reduce -40.5% | 72,878 | $167K |
| Deutsche Bank AG | 0.00% | New | 72,183 | $165K |
| Charles Schwab Investment Management Inc. | 0.00% | No change | 70,674 | $162K |
| Barclays PLC | 0.00% | Reduce -10.9% | 59,269 | $136K |
| Wellington Management Group LLP | 0.00% | Reduce -51.0% | 56,398 | $129K |
| Goldman Sachs Group Inc. | 0.00% | Reduce -2.8% | 52,081 | $119K |
| Jane Street Group, LLC | 0.00% | Add +200.0% | 51,803 | $119K |
| Marshall Wace, LLP | 0.00% | Reduce -22.5% | 44,517 | $102K |
| Acadian Asset Management LLC | 0.00% | Add +40.9% | 40,242 | $90K |
| Nuveen, LLC | 0.00% | No change | 36,843 | $84K |
| Lanark Financial, Inc. | 0.01% | Reduce -18.8% | 36,200 | $83K |
| Rhumbline Advisers | 0.00% | Add +9.4% | 34,781 | $80K |
| Osaic Holdings, Inc. | 0.00% | Add +5.7% | 31,103 | $74K |
| NewEdge Advisors, LLC | 0.00% | New | 25,494 | $58K |
| XTX Topco Ltd | 0.00% | Reduce -31.6% | 25,082 | $57K |
| Steinberganna Wealth Management | 0.03% | — | 24,265 | $56K |
| NJ State Employees Deferred Compensation Plan | 0.01% | No change | 24,000 | $55K |
| UBS Group AG | 0.00% | Reduce -44.2% | 20,468 | $47K |
| Wells Fargo & Company | 0.00% | Add +21.4% | 18,903 | $43K |
| Royce & Associates LP | 0.00% | Reduce -56.4% | 17,954 | $41K |
| Franklin Resources Inc. | 0.00% | New | 15,791 | $36K |
| BNP Paribas Financial Markets | 0.00% | Add +14.4% | 15,470 | $35K |
| HRT Financial LP | 0.00% | New | 15,076 | $34K |
| Virtu Financial LLC | 0.00% | New | 14,148 | $32K |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -69.1% | 13,385 | $31K |
| FMR LLC | 0.00% | Add +15.9% | 12,646 | $29K |
| Intech Investment Management LLC | 0.00% | Add +0.8% | 12,175 | $28K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Reduce -14.5% | 11,946 | $27K |
| Bank of America Corp. | 0.00% | Reduce -9.5% | 11,831 | $27K |
| Alliancebernstein L.P. | 0.00% | Add +11.8% | 11,390 | $26K |
| AQR Capital Management | 0.00% | New | 11,299 | $26K |
| Archer Investment Corp | 0.01% | Reduce -8.2% | 11,200 | $26K |
| Invesco Ltd. | 0.00% | New | 10,733 | $25K |
| New York State Common Retirement Fund | 0.00% | No change | 10,696 | $24K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | No change | 9,637 | $22K |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -35.7% | 4,870 | $11K |
| Union Bancaire Privee, UBP SA | 0.00% | No change | 4,230 | $10K |
| PNC Financial Services Group, Inc. | 0.00% | Reduce -8.4% | 3,745 | $9K |
| Legal & General Group Plc | 0.00% | No change | 2,179 | $5K |
| Russell Investments Group, Ltd. | 0.00% | New | 2,091 | $5K |
| Ameritas Investment Partners, Inc. | 0.00% | No change | 1,924 | $4K |
| California State Teachers Retirement System | 0.00% | Add +0.1% | 1,762 | $4K |
| Sterling Capital Management LLC | 0.00% | Add +157.1% | 1,674 | $4K |
| Amalgamated Bank | 0.00% | No change | 785 | $2K |
| Citigroup Inc. | 0.00% | Reduce -92.3% | 727 | $2K |
| Advisory Services Network, LLC | 0.00% | New | 500 | $1K |
| Cwm, LLC | 0.00% | Add +2.5% | 653 | $1K |
| Nisa Investment Advisors, LLC | 0.00% | Reduce -76.3% | 431 | $987 |
| Optiver Holding B.V. | 0.00% | New | 328 | $751 |
| Transamerica Financial Advisors, LLC | 0.00% | New | 156 | $357 |
| SBI Securities Co., Ltd. | 0.00% | Reduce -1.6% | 120 | $275 |
| Arax Advisory Partners | 0.00% | New | 70 | $160 |
| IFP Advisors, Inc | 0.00% | New | 30 | $69 |
| Clearstead Advisors, LLC | 0.00% | New | 11 | $26 |
| True Wealth Design, LLC | 0.00% | Reduce -33.3% | 8 | $19 |
| EverSource Wealth Advisors, LLC | 0.00% | No change | 4 | $9 |
| Essential Partners LLC | 0.00% | Reduce -33.3% | 2 | $5 |
| Allworth Financial LP | 0.00% | New | 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.