Insider holders · CIK 0001679268
MAMMOTH ENERGY SERVICES, INC. · TUSK
Every insider with a reported Table I holding at this company, ranked by their last-reported share count. A balance is only as fresh as its filing — the report date sits next to every row on purpose. ← Back to activity
| Insider | Direct shares | Indirect shares | Total reported | Last report (ET) | From |
|---|---|---|---|---|---|
| MEH SUB LLCDirector | 21,978,893 | 12,235 | 21,991,128 | Aug 1, 2018 · 5:10 pm EDT | Form 4 |
| Mammoth Energy Holdings LLCDirector | 20,445,923 | 6,667 | 20,452,590 | Oct 21, 2016 · 4:12 pm EDT | Form 4 |
| Wexford GP LLCChief Business Officer | 1,451,034 | 10,620,789 | 12,071,823 | Jun 22, 2026 · 4:26 pm EDT | Form 4 |
| Joseph JacobsChief Business Officer | 1,451,034 | 10,620,789 | 12,071,823 | Jun 22, 2026 · 4:26 pm EDT | Form 4 |
| WEXFORD CAPITAL LPChief Business Officer | 1,451,034 | 10,620,789 | 12,071,823 | Jun 22, 2026 · 4:26 pm EDT | Form 4 |
| Charles E DavidsonChief Business Officer | 1,451,034 | 10,620,789 | 12,071,823 | Jun 22, 2026 · 4:26 pm EDT | Form 4 |
| GULFPORT ENERGY CORPDirector | 9,829,548 | 6,667 | 9,836,215 | Aug 1, 2018 · 7:27 pm EDT | Form 4 |
| CD Holding Company, LLC10% Owner | 2,403,831 | 4,066,610 | 6,470,441 | Jun 22, 2026 · 4:18 pm EDT | Form 4 |
| Arty StraehlaChief Executive Officer | 185,317 | 1,792 | 187,109 | Nov 13, 2018 · 4:12 pm EST | Form 4 |
| Phillip LancasterDirector | 159,445 | — | 159,445 | Jul 1, 2026 · 4:56 pm EDT | Form 4 |
| Amron Holdings LLCDirector | 86,256 | 10,329 | 96,585 | Jun 22, 2026 · 4:32 pm EDT | Form 4 |
| Arthur H AmronDirector | 86,256 | 10,329 | 96,585 | Jun 22, 2026 · 4:32 pm EDT | Form 4 |
| Mark E. LaytonCFO and Secretary | 51,566 | — | 51,566 | Nov 13, 2018 · 4:09 pm EST | Form 4 |
| Paul M. JacobiChief Business Officer | 31,067 | — | 31,067 | Jun 22, 2026 · 4:42 pm EDT | Form 4 |
| Rusty Neal LaForgeVP, Gen. Couns., Asst. Sec. | 20,000 | — | 20,000 | Aug 9, 2018 · 3:12 pm EDT | Form 3 |
| James D PalmDirector | 19,725 | — | 19,725 | Jun 11, 2018 · 6:08 pm EDT | Form 4 |
| Matthew RossDirector | 12,235 | — | 12,235 | Jun 11, 2018 · 6:08 pm EDT | Form 4 |
| Arthur L SmithDirector | 12,235 | 0 | 12,235 | Dec 6, 2018 · 4:05 pm EST | Form 4 |
| Andre WeissDirector | 6,667 | — | 6,667 | Oct 21, 2016 · 6:55 pm EDT | Form 4 |
| Aaron GaydosikDirector | 6,667 | — | 6,667 | Oct 21, 2016 · 8:45 pm EDT | Form 4 |
| Mark Lawrence PlaumannDirector | 5,000 | — | 5,000 | Sep 17, 2026 · 4:50 pm EDT | Form 4 |
| Paul K Heerwagen IVDirector | 2,655 | — | 2,655 | Jun 11, 2018 · 6:08 pm EDT | Form 4 |
| Marc T McCarthyDirector | 2,655 | — | 2,655 | Jun 11, 2018 · 4:33 pm EDT | Form 4 |
Balances come from each insider’s most recent filing that reports a Table I holding; an insider who left the company years ago still appears with their last-known figure and its date. Indirect totals collapse multiple vehicles (trusts, LLCs) into one number — open the filing for the breakdown. Shares as filed, not split-adjusted.