Over the 90-day window ending February 19, 2026, Mammoth Energy Services's three dominant insider ownership positions are held by Director Capital Lp Wexford (21.69Mn shares), Chief Executive Officer Arty Straehla (1.01Mn shares), Cfo And Secretary Mark E. Layton (418.99K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Capital Lp Wexford | 21,690,075 | 14 Mar, 2024 | |
| Arty Straehla | Chief Executive Officer | 1,012,107 | 19 Dec, 2023 |
| Mark E. Layton | Cfo And Secretary | 418,985 | 07 Mar, 2023 |
| James D Palm | 240,144 | 14 Jun, 2024 | |
| Arthur L Smith | 130,034 | 27 May, 2025 | |
| Corey J. Booker | 125,488 | 26 Nov, 2024 | |
| Arthur H Amron | 57,135 | 15 Dec, 2025 | |
| Paul M. Jacobi | 27,856 | 14 Jun, 2024 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 11 Dec, 2025 | Arthur H Amron | Common Stock | A | 10,000 | $1.89 | 57,135 | D | P |
| 22 May, 2025 | Arthur L Smith | Common Stock | D | 20,000 | $2.51 | 130,034 | D | S |
| 20 May, 2025 | Arthur L Smith | Common Stock | D | 50,000 | $2.51 | 150,034 | D | S |
| 20 May, 2025 | Arthur L Smith | - | - | 150,034 | D | |||
| 19 May, 2025 | Arthur L Smith | - | - | 200,034 | D | |||
| 19 May, 2025 | Arthur L Smith | Common Stock | D | 15,000 | $2.49 | 200,034 | D | S |
| 12 Dec, 2024 | Arthur H Amron | - | - | 47,135 | D | |||
| 12 Dec, 2024 | Arthur H Amron | Common Stock | A | 1,000 | $2.97 | 47,135 | D | P |
| 25 Nov, 2024 | Corey J. Booker | Common Stock | D | 15,000 | $3.47 | 125,488 | D | S |
| 22 Nov, 2024 | Corey J. Booker | - | - | 140,488 | D | |||
| 22 Nov, 2024 | Corey J. Booker | Common Stock | D | 10,000 | $3.43 | 140,488 | D | S |
| 21 Nov, 2024 | Corey J. Booker | Common Stock | D | 6,709 | $3.25 | 150,488 | D | S |
| 20 Nov, 2024 | Corey J. Booker | Common Stock | D | 5,000 | $3.21 | 157,197 | D | S |
| 14 Nov, 2024 | Corey J. Booker | Common Stock | D | 3,607 | $3.50 | 162,197 | D | S |
| 14 Nov, 2024 | Corey J. Booker | - | - | 162,197 | D | |||
| 13 Nov, 2024 | Corey J. Booker | Common Stock | D | 7,100 | $3.68 | 165,804 | D | S |
| 11 Nov, 2024 | Corey J. Booker | - | - | 172,904 | D | |||
| 11 Nov, 2024 | Corey J. Booker | Common Stock | D | 3,494 | $3.61 | 172,904 | D | S |
| 08 Nov, 2024 | Corey J. Booker | Common Stock | D | 24 | $3.76 | 176,398 | D | S |
| 07 Nov, 2024 | Corey J. Booker | Common Stock | D | 165 | $3.90 | 176,422 | D | S |