Mammoth Energy Services, Inc. (TUSK) ownership: Wexford Capital LP 48% · institutions 71% · index and ETF funds 3% (13F 2026-03-31). Insider activity, 90 days: Insiders bought (0 sales, 3 open-market buys). SEC EDGAR first-party data.
| Holder | Shares | Market Value | % Outstanding | Reported |
|---|---|---|---|---|
| Wexford Capital LP | 22068212.00 | $54.07M | 45.8% | 2026-03-31 |
| Adage Capital Partners Gp, L.l.c. | 4575000.00 | $11.21M | 9.5% | 2026-03-31 |
| BlackRock | 1454839.00 | $3.56M | 3.0% | 2026-03-31 |
| Vanguard | 1138170.00 | $2.79M | 2.4% | 2026-03-31 |
| Dimensional Fund Advisors | 686199.00 | $1.68M | 1.4% | 2026-03-31 |
| Peapod Lane Capital LLC | 599805.00 | $1.51M | 1.2% | 2026-03-31 |
| Geode Capital Management | 610926.00 | $1.50M | 1.3% | 2026-03-31 |
| State Street | 421922.00 | $1.03M | 0.9% | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 | |
| Buy | null | 2026-06-17 | |
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 | |
| Sell | null | 2026-06-17 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.