11 insiders reported 31 Form 4 transactions for MAMMOTH ENERGY SERVICES, INC. (TUSK) over the past 18 months (most recent 2026-09-17). Recent activity: Plaumann Mark Lawrence (Director) Buy 5,000 shares, Lancaster Phillip (Director) Buy 68,152 shares, DAVIDSON CHARLES E (10% Owner) Buy 2.4M shares, CD Holding Company, LLC (10% Owner) Buy 2.4M shares, DAVIDSON CHARLES E (10% Owner) Buy 4.1M shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-17 | Plaumann Mark Lawrence | Director | Buy | 5,000 | $15,000 |
| 2026-07-01 | Lancaster Phillip | Director | Buy | 68,152 | $0 |
| 2026-06-22 | DAVIDSON CHARLES E | 10% Owner | Buy | 2.4M | $0 |
| 2026-06-22 | CD Holding Company, LLC | 10% Owner | Buy | 2.4M | $0 |
| 2026-06-22 | DAVIDSON CHARLES E | 10% Owner | Buy | 4.1M | $0 |
| 2026-06-22 | CD Holding Company, LLC | 10% Owner | Buy | 4.1M | $0 |
| 2026-06-22 | Jacobi Paul M. | Chief Business Officer | Buy | 3,211 | $0 |
| 2026-06-22 | Amron Arthur H | Director | Buy | 19,121 | $0 |
| 2026-06-22 | Amron Holdings LLC | Director | Buy | 19,121 | $0 |
| 2026-06-22 | Amron Arthur H | Director | Buy | 10,329 | $0 |
| 2026-06-22 | Amron Holdings LLC | Director | Buy | 10,329 | $0 |
| 2026-06-22 | DAVIDSON CHARLES E | Chief Business Officer | Buy | 1.1M | $0 |
| 2026-06-22 | JACOBS JOSEPH | Chief Business Officer | Buy | 1.1M | $0 |
| 2026-06-22 | Wexford GP LLC | Chief Business Officer | Buy | 1.1M | $0 |
| 2026-06-22 | DAVIDSON CHARLES E | Chief Business Officer | Buy | 6.4M | $0 |
| 2026-06-22 | WEXFORD CAPITAL LP | Chief Business Officer | Buy | 6.4M | $0 |
| 2026-06-22 | JACOBS JOSEPH | Chief Business Officer | Buy | 6.4M | $0 |
| 2026-06-22 | Wexford GP LLC | Chief Business Officer | Buy | 6.4M | $0 |
| 2026-06-22 | DAVIDSON CHARLES E | Chief Business Officer | Buy | 4.0M | $10.5M |
| 2026-06-22 | WEXFORD CAPITAL LP | Chief Business Officer | Buy | 4.0M | $10.5M |
| 2026-06-22 | JACOBS JOSEPH | Chief Business Officer | Buy | 4.0M | $10.5M |
| 2026-06-22 | Wexford GP LLC | Chief Business Officer | Buy | 4.0M | $10.5M |
| 2026-06-22 | WEXFORD CAPITAL LP | Chief Business Officer | Buy | 1.1M | $0 |
| 2026-06-15 | Amron Arthur H | Director | Buy | 2,000 | $6,560 |
| 2026-06-15 | Amron Arthur H | Director | Buy | 2,500 | $8,050 |
Source: SEC Form 4 filings · as of 2026-09-17