Mammoth Energy Services, Inc.
TUSK- Exchange
- Nasdaq
- Industry
- Oil & Gas Field Services, NEC
- SEC CIK
- 0001679268
In the last 90 days, Mammoth Energy Services, Inc. insiders filed 1 open-market purchase and 0 sales; 93 institutions reported holding it in 13F filings for Q2 2026, worth $84.7M in total; no superinvestor holds it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Mammoth Energy Services, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 1 filing
- 1 insider, $15.0K in total
- Open-market sells
- 0 filings
- Insiders trading
- 1
- Net value
- +$15.0K
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Mammoth Energy Services, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Plaumann Mark Lawrence | Director | 5,000 | Sep 17, 2026 | 1 |
| Lancaster Phillip | Director | 159,445 | Jul 1, 2026 | 1 |
| Amron Arthur H | Director | 10,329Indirect | Jun 22, 2026 | 4 |
| Amron Holdings LLC | Director | 10,329Indirect | Jun 22, 2026 | 1 |
| Davidson Charles E | Chief Business Officer | 10,620,789Indirect | Jun 22, 2026 | 2 |
| Wexford Capital LP | Chief Business Officer | 10,620,789Indirect | Jun 22, 2026 | 1 |
| Jacobs Joseph | Chief Business Officer | 10,620,789Indirect | Jun 22, 2026 | 1 |
| Wexford GP LLC | Chief Business Officer | 10,620,789Indirect | Jun 22, 2026 | 1 |
| CD Holding Company, LLC | 10% Owner | 4,066,610Indirect | Jun 22, 2026 | 1 |
| Jacobi Paul M. | Chief Business Officer | 31,067 | Jun 22, 2026 | 1 |
| Smith Arthur L | Director | 130,034 | May 27, 2025 | 0 |
| Booker Corey J. | Director | 125,488 | Nov 26, 2024 | 0 |
| Palm James D | Director | 240,144 | Jun 14, 2024 | 0 |
| Straehla Arty | Chief Executive Officer | 1,012,107 | Dec 19, 2023 | 0 |
| Layton Mark E. | CFO and Secretary | 418,985 | Mar 7, 2023 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Sep 17, 2026 (view filing)4:50 PM ET | Sep 16 | 1 day | Plaumann Mark LawrenceDirector | PPurchase | +5.00K | $3.00 | +$15.0K | New position5.00K after | |
| Jun 22, 2026 (view filing)4:26 PM ET | Jun 17 | 5 days | Davidson Charles E and 3 othersChief Business Officer | PPurchase | +4.02M | $2.60 | +$10.5M | +60.9%10.6M after | |
| Jun 15, 2026 (view filing) | Jun 11-12 | 4 days | Amron Arthur HDirector | PPurchase | +4.50K | $3.25 | +$14.6K | +7.2%67.1K after | 2 lots |
| May 28, 2026 (view filing) | May 26-28 | 2 days | Amron Arthur HDirector | PPurchase | +5.50K | $3.25 | +$17.9K | +9.6%62.6K after | 2 lots |
| Dec 15, 2025 (view filing) | Dec 11 | 4 days | Amron Arthur HDirector | PPurchase | +10.0K | $1.89 | +$18.9K | +21.2%57.1K after | |
| May 27, 2025 (view filing) | May 22 | 5 days | Smith Arthur LDirector | SSale | −20.0K | $2.51 | −$50.2K | −13.3%130.0K after | |
| May 21, 2025 (view filing) | May 19-20 | 2 days | Smith Arthur LDirector | SSale | −65.0K | $2.51 | −$162.8K | −30.2%150.0K after | 2 lots |
| Dec 16, 2024 (view filing) | Dec 12 | 4 days | Amron Arthur HDirector | PPurchase | +1.00K | $2.97 | +$2.97K | +2.2%47.1K after | |
| Nov 26, 2024 (view filing) | Nov 22-25 | 4 days | Booker Corey J.Director | SSale | −25.0K | $3.45 | −$86.3K | −16.6%125.5K after | 2 lots |
| Nov 22, 2024 (view filing) | Nov 20-21 | 2 days | Booker Corey J.Director | SSale | −11.7K | $3.23 | −$37.9K | −7.2%150.5K after | 2 lots |
| Nov 15, 2024 (view filing) | Nov 13-14 | 2 days | Booker Corey J.Director | SSale | −10.7K | $3.62 | −$38.8K | −6.2%162.2K after | 2 lots |
| Nov 12, 2024 (view filing) | Nov 7-11 | 5 days | Booker Corey J.Director | SSale | −3.68K | $3.62 | −$13.3K | −2.1%172.9K after | 3 lots |
| May 30, 2024 (view filing) | May 28-30 | 2 days | Amron Arthur HDirector | PPurchase | +5.00K | $3.62 | +$18.1K | +37.7%18.3K after | 2 lots |
| Mar 14, 2024 (view filing) | Mar 12 | 2 days | Amron Arthur HDirector | PPurchase | +3.00K | $3.72 | +$11.2K | +29.2%13.3K after | |
| Dec 19, 2023 (view filing) | Dec 18-19 | 1 day | Straehla ArtyChief Executive Officer | SSale | −70.0K | $4.36 | −$305.4K | −6.5%1.01M after | 2 lots |
| Dec 15, 2023 (view filing) | Dec 13-15 | 2 days | Straehla ArtyChief Executive Officer | SSale | −120.0K | $4.40 | −$528.4K | −10.0%1.08M after | 3 lots |
| Nov 14, 2022 (view filing) | Nov 11 | 3 days | Smith Arthur LDirector | SSale | −20.0K | $7.07 | −$141.4K | −10.9%163.4K after | |
| Jun 21, 2022 (view filing)4:32 PM ET | Jun 16-17 | 5 days | Davidson Charles E and 3 othersDirector, 10% Owner | PPurchase | +45.4K | $2.14 | +$97.0K | +0.2%22.4M after | 2 lots |
| Jun 15, 2022 (view filing)4:37 PM ET | Jun 13-15 | 2 days | Davidson Charles E and 3 othersDirector, 10% Owner | PPurchase | +50.8K | $2.31 | +$117.3K | +0.2%22.4M after | 3 lots |
| Jun 10, 2022 (view filing)4:34 PM ET | Jun 8-10 | 2 days | Davidson Charles E and 3 othersDirector, 10% Owner | PPurchase | +97.8K | $2.47 | +$241.4K | +0.4%22.3M after | 3 lots |
| Mar 11, 2022 (view filing) | Mar 10 | 1 day | Layton Mark E.CFO and Secretary | SSale | −40.4K | $2.04 | −$82.5K | −8.2%455.4K after | |
| Dec 14, 2021 (view filing) | Dec 13 | 1 day | Smith Arthur LDirector | PPurchase | +25.0K | $2.00 | +$50.0K | +16.1%180.3K after |