Mammoth Energy Services, Inc. (TUSK) · Insider trading
What Mammoth Energy Services's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.
Bought, 12 months
$10.52M
3 insiders, 7 trades
Sold, 12 months
$0
0 insiders
Net, 12 months
+$10.52M
bought less sold
Latest filing
2026-09-17
filings read to 2026-10-19
Who traded, two years
| Insider | Bought | Sold | Trades | Last trade | Holds after |
|---|---|---|---|---|---|
| Davidson Charles eDirector, Chief Business Officer, 10% owner | $10.45M | – | 1 | 2026-06-17 | – |
| Smith Arthur LDirector | – | $213,050 | 3 | 2025-05-22 | 130,034 |
| Booker Corey J.Director | – | $176,304 | 9 | 2024-11-25 | 125,488 |
| Amron Arthur HDirector | $54,330 | – | 6 | 2026-06-12 | 67,135 |
| Plaumann Mark LawrenceDirector | $15,000 | – | 1 | 2026-09-16 | 5,000 |
Open-market purchases and sales
Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.
| Date | Insider | Trade | Shares | Price | Value | Holds after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-16 | Plaumann Mark LawrenceDirector | Buy | 5,000 | 3.00 | $15,000 | 5,000 | Form 4 |
| 2026-06-17 | Davidson Charles eDirector, Chief Business Officer, 10% ownerwith Wexford Capital LP, Jacobs Joseph, Wexford GP LLC | Buyindirect | 4,019,574 | 2.60 | $10.45M | 10,620,789 | Form 4 |
| 2026-06-12 | Amron Arthur HDirector | Buy | 2,000 | 3.28 | $6,560 | 67,135 | Form 4 |
| 2026-06-11 | Amron Arthur HDirector | Buy | 2,500 | 3.22 | $8,050 | 65,135 | Form 4 |
| 2026-05-28 | Amron Arthur HDirector | Buy | 3,000 | 3.25 | $9,750 | 62,635 | Form 4 |
| 2026-05-26 | Amron Arthur HDirector | Buy | 2,500 | 3.24 | $8,100 | 59,635 | Form 4 |
| 2025-12-11 | Amron Arthur HDirector | Buy | 10,000 | 1.89 | $18,900 | 57,135 | Form 4 |
| 2025-05-22 | Smith Arthur LDirector | Sale | 20,000 | 2.51 | $50,200 | 130,034 | Form 4 |
| 2025-05-20 | Smith Arthur LDirector | Sale | 50,000 | 2.51 | $125,500 | 150,034 | Form 4 |
| 2025-05-19 | Smith Arthur LDirector | Sale | 15,000 | 2.49 | $37,350 | 200,034 | Form 4 |
| 2024-12-12 | Amron Arthur HDirector | Buy | 1,000 | 2.97 | $2,970 | 47,135 | Form 4 |
| 2024-11-25 | Booker Corey J.Director | Sale | 15,000 | 3.47 | $52,050 | 125,488 | Form 4 |
| 2024-11-22 | Booker Corey J.Director | Sale | 10,000 | 3.43 | $34,300 | 140,488 | Form 4 |
| 2024-11-21 | Booker Corey J.Director | Sale | 6,709 | 3.25 | $21,804 | 150,488 | Form 4 |
| 2024-11-20 | Booker Corey J.Director | Sale | 5,000 | 3.21 | $16,050 | 157,197 | Form 4 |
| 2024-11-14 | Booker Corey J.Director | Sale | 3,607 | 3.50 | $12,624 | 162,197 | Form 4 |
| 2024-11-13 | Booker Corey J.Director | Sale | 7,100 | 3.68 | $26,128 | 165,804 | Form 4 |
| 2024-11-11 | Booker Corey J.Director | Sale | 3,494 | 3.61 | $12,613 | 172,904 | Form 4 |
| 2024-11-08 | Booker Corey J.Director | Sale | 24 | 3.76 | $90 | 176,398 | Form 4 |
| 2024-11-07 | Booker Corey J.Director | Sale | 165 | 3.90 | $644 | 176,422 | Form 4 |
Grants, exercises and other transactions
Pay, tax and paperwork rather than a choice to trade at the market price. Two years.
8 × other
Show them
| Date | Insider | What | Shares | Price | Holds after | Filing |
|---|---|---|---|---|---|---|
| 2026-06-26 | Lancaster PhillipDirector | Other J | +68,152 | – | 159,445 | Form 4 |
| 2026-06-17 | Davidson Charles e10% owner | Other J | +2,403,831 | – | 2,403,831 | Form 4 |
| 2026-06-17 | Davidson Charles e10% owner | Other J | +4,066,610 | – | 4,066,610 | Form 4 |
| 2026-06-17 | Davidson Charles eDirector, Chief Business Officer, 10% owner | Other J | +1,072,896 | – | 1,451,034 | Form 4 |
| 2026-06-17 | Davidson Charles eDirector, Chief Business Officer, 10% owner | Other J | +6,354,667 | – | 6,601,215 | Form 4 |
| 2026-06-17 | Amron Arthur HDirector | Other J | +19,121 | – | 86,256 | Form 4 |
| 2026-06-17 | Amron Arthur HDirector | Other J | +10,329 | – | 10,329 | Form 4 |
| 2026-06-17 | Jacobi Paul M.Director, Chief Business Officer | Other J | +3,211 | – | 31,067 | Form 4 |
How to read it
- Buy, sale
- Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
- Plan
- A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
- Holds after
- The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
- Value
- Shares times the price the form reports, which is often an average over several fills on the day.
Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.