Mammoth Energy Services, Inc. (TUSK) — insider trading
Energy · NASDAQ
Mammoth Energy Services, Inc. (TUSK) has 21 reported SEC Form 4 insider transactions in our data, including 8 open-market purchases and 5 open-market sales among the most recent 21 (latest 2026-09-16).
Recent Form 4 transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-16 | Plaumann Mark Lawrence | Director | Open-market purchase | 5,000 | $3.00 | $15.0K | Form 4 |
| 2026-06-26 | Lancaster Phillip | Director | Other acquisition or disposition | 68,152 | — | $0 | Form 4 |
| 2026-06-17 | DAVIDSON CHARLES E; CD Holding Company, LLC | 10% owner | Other acquisition or disposition | 4,066,610 | — | $0 | Form 4 |
| 2026-06-17 | DAVIDSON CHARLES E; CD Holding Company, LLC | 10% owner | Other acquisition or disposition | 2,403,831 | — | $0 | Form 4 |
| 2026-06-17 | WEXFORD CAPITAL LP; Wexford GP LLC; DAVIDSON CHARLES E; JACOBS JOSEPH | Director, Officer (Chief Business Officer), 10% owner | Open-market purchase | 4,019,574 | $2.60 | $10.47M | Form 4 |
| 2026-06-17 | WEXFORD CAPITAL LP; Wexford GP LLC; DAVIDSON CHARLES E; JACOBS JOSEPH | Director, Officer (Chief Business Officer), 10% owner | Other acquisition or disposition | 6,354,667 | — | $0 | Form 4 |
| 2026-06-17 | WEXFORD CAPITAL LP; Wexford GP LLC; DAVIDSON CHARLES E; JACOBS JOSEPH | Director, Officer (Chief Business Officer), 10% owner | Other acquisition or disposition | 1,072,896 | — | $0 | Form 4 |
| 2026-06-17 | Amron Arthur H; Amron Holdings LLC | Director | Other acquisition or disposition | 10,329 | — | $0 | Form 4 |
| 2026-06-17 | Amron Arthur H; Amron Holdings LLC | Director | Other acquisition or disposition | 19,121 | — | $0 | Form 4 |
| 2026-06-17 | Jacobi Paul M. | Director, Officer (Chief Business Officer) | Other acquisition or disposition | 3,211 | — | $0 | Form 4 |
| 2026-06-12 | Amron Arthur H | Director | Open-market purchase | 2,000 | $3.28 | $6.6K | Form 4 |
| 2026-06-11 | Amron Arthur H | Director | Open-market purchase | 2,500 | $3.22 | $8.0K | Form 4 |
| 2026-05-28 | Amron Arthur H | Director | Open-market purchase | 3,000 | $3.25 | $9.8K | Form 4 |
| 2026-05-26 | Amron Arthur H | Director | Open-market purchase | 2,500 | $3.24 | $8.1K | Form 4 |
| 2025-12-11 | Amron Arthur H | Director | Open-market purchase | 10,000 | $1.89 | $18.9K | Form 4 |
| 2025-05-22 | SMITH ARTHUR L | Director | Open-market sale | 20,000 | $2.51 | $50.2K | Form 4 |
| 2025-05-20 | SMITH ARTHUR L | Director | Open-market sale | 50,000 | $2.51 | $125.5K | Form 4 |
| 2025-05-19 | SMITH ARTHUR L | Director | Open-market sale | 15,000 | $2.49 | $37.4K | Form 4 |
| 2024-12-12 | Amron Arthur H | Director | Open-market purchase | 1,000 | $2.97 | $3.0K | Form 4 |
| 2024-11-25 | Booker Corey J. | Director | Open-market sale | 15,000 | $3.47 | $52.0K | Form 4 |
| 2024-11-22 | Booker Corey J. | Director | Open-market sale | 10,000 | $3.43 | $34.3K | Form 4 |
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Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: Mammoth Energy Services, Inc. (TUSK).
Last updated 2026-09-16 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.