10 insiders reported 26 Form 4 transactions for MAMMOTH ENERGY SERVICES, INC. (TUSK) over the past 18 months (most recent 2026-07-01). Recent activity: Lancaster Phillip (Director) Buy 68,152 shares, Amron Arthur H (Director) Buy 10,329 shares, DAVIDSON CHARLES E (Chief Business Officer) Buy 1.1M shares, WEXFORD CAPITAL LP (Chief Business Officer) Buy 1.1M shares, JACOBS JOSEPH (Chief Business Officer) Buy 1.1M shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-07-01 | Lancaster Phillip | Director | Buy | 68,152 | $0 |
| 2026-06-22 | Amron Arthur H | Director | Buy | 10,329 | $0 |
| 2026-06-22 | DAVIDSON CHARLES E | Chief Business Officer | Buy | 1.1M | $0 |
| 2026-06-22 | WEXFORD CAPITAL LP | Chief Business Officer | Buy | 1.1M | $0 |
| 2026-06-22 | JACOBS JOSEPH | Chief Business Officer | Buy | 1.1M | $0 |
| 2026-06-22 | Amron Arthur H | Director | Buy | 19,121 | $0 |
| 2026-06-22 | Wexford GP LLC | Chief Business Officer | Buy | 1.1M | $0 |
| 2026-06-22 | Jacobi Paul M. | Chief Business Officer | Buy | 3,211 | $0 |
| 2026-06-22 | Amron Holdings LLC | Director | Buy | 19,121 | $0 |
| 2026-06-22 | CD Holding Company, LLC | Insider | Buy | 2.4M | $0 |
| 2026-06-22 | DAVIDSON CHARLES E | Insider | Buy | 4.1M | $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 | Amron Holdings LLC | Director | Buy | 10,329 | $0 |
| 2026-06-22 | CD Holding Company, LLC | Insider | Buy | 4.1M | $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 | DAVIDSON CHARLES E | Insider | Buy | 2.4M | $0 |
| 2025-12-15 | Amron Arthur H | Director | Buy | 10,000 | $18,900 |
| 2025-05-27 | SMITH ARTHUR L | Director | Sell | 20,000 | $50,200 |
| 2025-05-21 | SMITH ARTHUR L | Director | Sell | 15,000 | $37,350 |
Source: SEC Form 4 filings · as of 2026-07-01