Mammoth Energy ServicesTUSK
13F holders, Q2 2025 (June 30)66holders +1
5new positions
6sold out
3famous investors
$2.80avg. 13F price*
At the end of Q2 2025, 66 institutions reported holding Mammoth Energy Services Inc. (TUSK) in their 13F filings, up 1 from Q1 2025. 5 opened new positions and 6 sold out. The largest holders were Wexford Capital LP ($61.9M), Adage Capital Partners Gp, L.L.C. ($12.8M) and Valueworks LLC ($6.7M). 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 Israel Englander (0.0% of Millennium 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 2025 → Q2 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 5 | $353K |
| Exits | 6 | $517K |
All 13F filers, Q1 2025 → Q2 2025: 1,189,193 shares bought and 2,102,092 shares sold, net −912,899 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 66 holders
| Wexford Capital LP | 17.26% | Add +0.1% | 22,096,068 | $61.9M |
| Adage Capital Partners Gp, L.L.C. | 0.02% | Add +10.2% | 4,575,000 | $12.8M |
| Valueworks LLC | 2.21% | Reduce -14.9% | 2,389,031 | $6.7M |
| BlackRock, Inc. | 0.00% | Add +0.6% | 1,469,099 | $4.1M |
| Dimensional Fund Advisors LP | 0.00% | Reduce -0.7% | 993,914 | $2.8M |
| Vanguard Group Inc. | 0.00% | Add +1.4% | 957,241 | $2.7M |
| Geode Capital Management, LLC | 0.00% | Add +6.5% | 580,659 | $1.6M |
| State Street Corp. | 0.00% | Add +1.6% | 408,763 | $1.1M |
| Bridgeway Capital Management, LLC | 0.02% | Add +4.4% | 350,454 | $981K |
| Northern Trust Corp. | 0.00% | Reduce -4.5% | 193,842 | $543K |
| JPMorgan Chase & Co. | 0.00% | Add +726.7% | 185,761 | $520K |
| Morgan Stanley | 0.00% | Add +103.1% | 185,260 | $519K |
| Empowered Funds, LLC | 0.01% | Add +9.3% | 174,454 | $488K |
| CastleKnight Management LP | 0.03% | No change | 167,433 | $469K |
| Citadel Advisors | 0.00% | Reduce -20.4% | 146,482 | $410K |
| Renaissance Technologies | 0.00% | Reduce -2.3% | 132,172 | $370K |
| Bank of New York Mellon Corp | 0.00% | Add +9.0% | 132,145 | $370K |
| Susquehanna International Group, LLP | 0.00% | Add +31.1% | 122,552 | $343K |
| Wellington Management Group LLP | 0.00% | Add +86.4% | 115,212 | $323K |
| Stifel Financial Corp. | 0.00% | Add +0.3% | 105,869 | $296K |
| Royal Bank of Canada | 0.00% | Add +2132.5% | 87,289 | $244K |
| Charles Schwab Investment Management Inc. | 0.00% | No change | 70,674 | $198K |
| Barclays PLC | 0.00% | Add +34.4% | 66,548 | $186K |
| Marshall Wace, LLP | 0.00% | New | 57,436 | $161K |
| Goldman Sachs Group Inc. | 0.00% | Reduce -19.5% | 53,601 | $150K |
| Lanark Financial, Inc. | 0.01% | Reduce -21.7% | 44,580 | $124K |
| T. Rowe Price Associates Inc. | 0.00% | Add +63.5% | 43,285 | $122K |
| Royce & Associates LP | 0.00% | Reduce -96.8% | 41,154 | $115K |
| Nuveen, LLC | 0.00% | No change | 36,843 | $103K |
| UBS Group AG | 0.00% | Add +21.3% | 36,671 | $103K |
| XTX Topco Ltd | 0.00% | New | 36,662 | $103K |
| Rhumbline Advisers | 0.00% | Add +32.3% | 31,804 | $89K |
| Osaic Holdings, Inc. | 0.00% | Reduce -50.6% | 29,433 | $82K |
| Acadian Asset Management LLC | 0.00% | Add +143.9% | 28,563 | $79K |
| NJ State Employees Deferred Compensation Plan | 0.01% | No change | 24,000 | $67K |
| Millennium Management | 0.00% | Reduce -62.8% | 21,851 | $61K |
| Jane Street Group, LLC | 0.00% | Add +48.3% | 17,268 | $48K |
| Wells Fargo & Company | 0.00% | Add +6.8% | 15,568 | $44K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Reduce -4.3% | 13,970 | $39K |
| BNP Paribas Financial Markets | 0.00% | Add +28.4% | 13,525 | $38K |
| Bank of America Corp. | 0.00% | Reduce -7.8% | 13,069 | $37K |
| Penbrook Management LLC | 0.03% | Reduce -7.1% | 13,000 | $36K |
| Archer Investment Corp | 0.01% | No change | 12,200 | $34K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | New | 12,121 | $34K |
| Intech Investment Management LLC | 0.00% | Reduce -32.4% | 12,080 | $34K |
| FMR LLC | 0.00% | Reduce -18.8% | 10,914 | $31K |
| New York State Common Retirement Fund | 0.00% | No change | 10,696 | $30K |
| Alliancebernstein L.P. | 0.00% | New | 10,190 | $29K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | New | 9,637 | $27K |
| Citigroup Inc. | 0.00% | Reduce -45.4% | 9,458 | $26K |
| Group One Trading LLC | 0.00% | Add +41.0% | 8,164 | $23K |
| Tower Research Capital LLC (TRC) | 0.00% | Add +63.3% | 7,569 | $21K |
| Union Bancaire Privee, UBP SA | 0.00% | No change | 4,230 | $12K |
| PNC Financial Services Group, Inc. | 0.00% | Add +77.4% | 4,087 | $11K |
| Legal & General Group Plc | 0.00% | No change | 2,179 | $6K |
| Simplex Trading, LLC | 0.00% | Reduce -78.2% | 2,419 | $6K |
| Ameritas Investment Partners, Inc. | 0.00% | No change | 1,924 | $5K |
| Nisa Investment Advisors, LLC | 0.00% | Add +1256.0% | 1,817 | $5K |
| California State Teachers Retirement System | 0.00% | No change | 1,761 | $5K |
| Amalgamated Bank | 0.00% | No change | 785 | $2K |
| Cwm, LLC | 0.00% | Reduce -0.6% | 637 | $2K |
| Sterling Capital Management LLC | 0.00% | Add +49.0% | 651 | $2K |
| SBI Securities Co., Ltd. | 0.00% | Add +1.7% | 122 | $342 |
| True Wealth Design, LLC | 0.00% | Add +71.4% | 12 | $34 |
| EverSource Wealth Advisors, LLC | 0.00% | No change | 4 | $11 |
| Essential Partners LLC | 0.00% | — | 3 | $8 |
"% of holder's portfolio" is TUSK's weight in each manager's 13F, not the share of Mammoth Energy Services Inc. the manager owns.