TUSK (Mammoth Energy Services, Inc. Common Stock)
Insider Trading Activity
Every open-market purchase and sale reported by TUSK officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-07-01 | Phillip Lancaster | Director | J | — | — |
| 2026-06-22 | Paul M. Jacobi | Chief Business Officer | J | — | — |
| 2026-06-22 | CD Holding Company, LLC | 10%+ Owner | J | — | — |
| 2026-06-22 | Amron Holdings LLC | Director | J | — | — |
| 2026-06-22 | JOSEPH JACOBS | Chief Business Officer | MIXED | — | — |
| 2026-06-15 | Arthur H Amron | Director | Buy | — | — |
| 2026-05-28 | Arthur H Amron | Director | Buy | — | — |
| 2025-12-15 | Arthur H Amron | Director | Buy | — | — |
| 2025-05-27 | ARTHUR L SMITH | Director | Sell | — | — |
| 2025-05-21 | ARTHUR L SMITH | Director | Sell | — | — |
| 2024-12-16 | Arthur H Amron | Director | Buy | — | — |
| 2024-11-26 | Corey J. Booker | Director | Sell | — | — |
| 2024-11-22 | Corey J. Booker | Director | Sell | — | — |
| 2024-11-15 | Corey J. Booker | Director | Sell | — | — |
| 2024-11-12 | Corey J. Booker | Director | Sell | — | — |
| 2024-06-14 | Paul M. Jacobi | Director | A | — | — |
| 2024-06-14 | James D Palm | Director | A | — | — |
| 2024-06-14 | Corey J. Booker | Director | A | — | — |
| 2024-06-14 | Arthur H Amron | Director | A | — | — |
| 2024-06-14 | ARTHUR L SMITH | Director | A | — | — |
| 2024-05-30 | Arthur H Amron | Director | Buy | — | — |
| 2024-03-14 | Arthur H Amron | Director | Buy | — | — |
| 2024-03-14 | JOSEPH JACOBS | Director | J | — | — |
| 2023-12-19 | Arty Straehla | Chief Executive Officer | Sell | — | — |
| 2023-12-15 | Arty Straehla | Chief Executive Officer | Sell | — | — |
| 2023-06-08 | James D Palm | Director | A | — | — |
| 2023-06-08 | Arthur H Amron | Director | A | — | — |
| 2023-06-08 | Paul M. Jacobi | Director | A | — | — |
| 2023-06-08 | Corey J. Booker | Director | A | — | — |
| 2023-06-08 | ARTHUR L SMITH | Director | A | — | — |
| 2023-03-07 | Mark E. Layton | CFO and Secretary | F | — | — |
| 2023-03-07 | Arty Straehla | Chief Executive Officer | F | — | — |
| 2022-11-14 | ARTHUR L SMITH | Director | Sell | — | — |
| 2022-06-30 | Arthur H Amron | Director | A | — | — |
| 2022-06-30 | James D Palm | Director | A | — | — |
| 2022-06-30 | Corey J. Booker | Director | A | — | — |
| 2022-06-30 | Paul M. Jacobi | Director | A | — | — |
| 2022-06-30 | ARTHUR L SMITH | Director | A | — | — |
| 2022-06-21 | WEXFORD CAPITAL LP | Director | Buy | — | — |
| 2022-06-15 | JOSEPH JACOBS | Director | Buy | — | — |
| 2022-06-10 | Wexford GP LLC | Director | Buy | — | — |
| 2022-03-11 | Mark E. Layton | CFO and Secretary | Sell | — | — |
| 2021-12-14 | ARTHUR L SMITH | Director | Buy | — | — |
| 2021-06-04 | Paul M. Jacobi | Director | A | — | — |
| 2021-06-04 | James D Palm | Director | A | — | — |
| 2021-06-04 | ARTHUR L SMITH | Director | A | — | — |
| 2021-06-04 | ARTHUR H AMRON | Director | A | — | — |
| 2021-06-04 | Corey J. Booker | Director | A | — | — |
| 2021-03-11 | Mark E. Layton | CFO and Secretary | Sell | — | — |
| 2021-03-11 | Arty Straehla | Chief Executive Officer | Sell | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | Director | 47,443,444 | — |
| — | Director | 44,024,166 | — |
| — | Director | 22,337,941 | — |
| — | Chief Business Officer | 12,071,823 | — |
| — | Director | 9,836,215 | — |
| — | 10%+ Owner | 6,470,441 | — |
| — | Chief Executive Officer | 1,053,899 | — |
| — | CFO and Secretary | 418,985 | — |
| — | Director | 240,144 | — |
| — | Director | 159,445 | — |
| — | Director | 140,488 | — |
| — | Director | 130,034 | — |
| — | Director | 96,585 | — |
| — | Director | 67,135 | — |
| — | Director | 36,674 | — |
| — | Chief Business Officer | 31,067 | — |
| — | Director | 19,815 | — |
| — | Director | 10,493 | — |
| — | Director | 10,493 | — |
| — | Director | 6,667 | — |
| — | Director | 6,667 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the TUSK quote page; the site-wide leaderboard is on the insider transactions hub.