Company · CIK 0001679268 · SIC 1389 — Oil & Gas Field Services, NEC · Nasdaq
MAMMOTH ENERGY SERVICES, INC. · TUSK
Insider activity reported against this company. All insider holders · On EDGAR ↗
Reported at this company — common stock
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 16, 2026 PForm 4 → | Sep 17, 4:50 pm EDT | Mark Lawrence PlaumannDirector | 5,000 | $3.00 | $15,000 | 5,000 | — | |
| Jun 26, 2026 JForm 4 → | Jul 1, 4:56 pm EDT | Phillip LancasterDirector | 68,152 | — | — | 159,445 | — | late |
| Jun 17, 2026 JForm 4 → | Jun 22, 4:42 pm EDT | Paul M. JacobiChief Business Officer, Director | 3,211 | — | — | 31,067 | — | |
| Jun 17, 2026 JForm 4 → | Jun 22, 4:32 pm EDT | Arthur H Amron +1Director | 29,450 | — | — | 10,329 | — | |
| Jun 17, 2026 PForm 4 → | Jun 22, 4:26 pm EDT | WEXFORD CAPITAL LP +3Chief Business Officer, Director, 10% Owner | 4,019,574 | $2.60 | $10,468,177 | 10,620,789 | +60.9% | |
| Jun 17, 2026 JForm 4 → | Jun 22, 4:26 pm EDT | WEXFORD CAPITAL LP +3Chief Business Officer, Director, 10% Owner | 7,427,563 | — | — | 6,601,215 | — | |
| Jun 17, 2026 JForm 4 → | Jun 22, 4:18 pm EDT | Charles E Davidson +110% Owner | 6,470,441 | — | — | 4,066,610 | — | |
| Jun 11, 2026 PForm 4 → | Jun 15, 4:28 pm EDT | Arthur H AmronDirector | 4,500 | $3.25 | $14,610 | 67,135 | +7.18% | |
| Jan 25, 2019 AForm 4 → | Jan 29, 5:41 pm EST | Arthur H AmronDirector | 1,549 | — | — | 1,549 | — | plan? |
| Dec 3, 2018 SForm 4 → | Dec 6, 4:05 pm EST | Arthur L SmithDirector | 6,000 | $24.85 | $149,099 | 0 | −100% | plan? |
| Nov 8, 2018 SForm 4 → | Nov 13, 4:12 pm EST | Arty StraehlaChief Executive Officer, Director | 38,841 | $26.68 | $1,036,442 | 185,317 | −17.3% | plan? late |
| Nov 8, 2018 SForm 4 → | Nov 13, 4:09 pm EST | Mark E. LaytonCFO and Secretary | 1,136 | $27.13 | $30,820 | 51,566 | −2.16% | plan? late |
| Jul 30, 2018 SForm 4 → | Aug 1, 7:27 pm EDT | GULFPORT ENERGY CORPDirector, 10% Owner | 118,974 | $38.01 | $4,522,202 | 9,829,548 | −1.20% | plan? |
| Jul 30, 2018 SForm 4 → | Aug 1, 5:10 pm EDT | MEH SUB LLC +4Director, 10% Owner | 266,026 | $38.01 | $10,111,648 | 21,978,893 | −1.20% | plan? |
| Jun 29, 2018 SForm 4 → | Jul 3, 4:22 pm EDT | GULFPORT ENERGY CORPDirector, 10% Owner | 1,235,600 | $38.01 | $46,965,156 | 9,948,522 | −11.0% | plan? |
| Jun 29, 2018 SForm 4 → | Jul 3, 2:43 pm EDT | MEH SUB LLC +4Director, 10% Owner | 2,764,400 | $38.01 | $105,074,844 | 22,244,919 | −11.1% | plan? |
| Jun 7, 2018 AForm 4 → | Jun 11, 6:08 pm EDT | Paul K Heerwagen IVDirector | 2,655 | — | — | 2,655 | — | plan? |
| Jun 7, 2018 AForm 4 → | Jun 11, 6:08 pm EDT | James D PalmDirector | 2,655 | — | — | 19,725 | — | plan? |
| Jun 7, 2018 AForm 4 → | Jun 11, 6:08 pm EDT | Matthew RossDirector | 2,655 | — | — | 12,235 | — | plan? |
| Jun 7, 2018 AForm 4 → | Jun 11, 6:06 pm EDT | Arthur L SmithDirector | 2,655 | — | — | 12,235 | — | plan? |
| Jun 7, 2018 AForm 4 → | Jun 11, 4:33 pm EDT | Marc T McCarthyDirector | 2,655 | — | — | 2,655 | — | plan? |
| Mar 1, 2018 SForm 4 → | Mar 7, 8:35 pm EST | Mark E. LaytonCFO and Secretary | 4,373 | $26.13 | $114,252 | 52,702 | −7.66% | plan? late |
| Feb 2, 2018 AForm 4 → | Feb 6, 6:09 pm EST | Paul K Heerwagen IVDirector | 2,913 | — | — | 2,913 | — | plan? |
| Feb 2, 2018 AForm 4 → | Feb 6, 6:07 pm EST | Matthew RossDirector | 2,913 | — | — | 9,580 | — | plan? |
| Feb 2, 2018 AForm 4 → | Feb 6, 6:06 pm EST | Arthur L SmithDirector | 2,913 | — | — | 9,580 | — | plan? |
| Feb 2, 2018 AForm 4 → | Feb 6, 6:06 pm EST | James D PalmDirector | 4,370 | — | — | 17,070 | — | plan? |
| Feb 2, 2018 AForm 4 → | Feb 6, 5:39 pm EST | Marc T McCarthyDirector | 2,913 | — | — | 2,913 | — | plan? |
| Nov 14, 2017 SForm 4 → | Nov 16, 6:58 pm EST | Mark E. LaytonCFO and Secretary | 925 | $19.01 | $17,587 | 57,075 | −1.59% | plan? |
| Nov 14, 2017 SForm 4 → | Nov 16, 6:58 pm EST | Arty StraehlaChief Executive Officer, Director | 25,842 | $18.45 | $476,762 | 224,158 | −10.3% | plan? |
| Aug 24, 2017 PForm 4 → | Aug 28, 7:58 pm EDT | James D PalmDirector | 6,000 | $12.75 | $76,523 | 12,700 | +89.6% | plan? |
| Jun 9, 2017 PForm 4 → | Jun 13, 5:01 pm EDT | Arthur L SmithDirector | 6,000 | $16.91 | $101,457 | 6,000 | — | plan? |
| Jun 8, 2017 AForm 4 → | Jun 22, 4:47 pm EDT | MEH SUB LLC +4Director, 10% Owner | 4,565,416 | — | — | 25,009,319 | — | plan? late |
| Jun 5, 2017 AForm 5 → | Feb 14, 2018, 8:52 pm EST | GULFPORT ENERGY CORPDirector, 10% Owner | 2,098,137 | — | — | 11,181,467 | — | plan? |
| Feb 28, 2017 PForm 4 → | Mar 2, 6:36 pm EST | Arty StraehlaChief Executive Officer, Director | 460 | $21.76 | $10,008 | 460 | — | plan? |
| Feb 21, 2017 AForm 4 → | Feb 23, 5:57 pm EST | Mark E. LaytonCFO and Secretary | 40,000 | — | — | 58,000 | — | plan? |
| Nov 7, 2016 AForm 4 → | Nov 9, 8:19 pm EST | Matthew RossDirector | 6,667 | — | — | 6,667 | — | plan? |
| Oct 19, 2016 AForm 4 → | Oct 21, 8:45 pm EDT | Aaron GaydosikDirector | 6,667 | — | — | 6,667 | — | plan? |
| Oct 19, 2016 SForm 4 → | Oct 21, 8:38 pm EDT | GULFPORT ENERGY CORPDirector, 10% Owner | 76,250 | $14.06 | $1,072,266 | 9,080,417 | −0.83% | plan? |
| Oct 19, 2016 AForm 4 → | Oct 21, 6:58 pm EDT | Mark E. LaytonCFO and Secretary | 15,000 | — | — | 18,000 | — | plan? |
| Oct 19, 2016 PForm 4 → | Oct 21, 6:58 pm EDT | Mark E. LaytonCFO and Secretary | 3,000 | $15.00 | $45,000 | 3,000 | — | plan? |
| Oct 19, 2016 AForm 4 → | Oct 21, 6:56 pm EDT | Arthur L SmithDirector | 6,667 | — | — | 6,667 | — | plan? |
| Oct 19, 2016 AForm 4 → | Oct 21, 6:55 pm EDT | Arty StraehlaChief Executive Officer, Director | 250,000 | — | — | 251,332 | — | plan? |
| Oct 19, 2016 PForm 4 → | Oct 21, 6:55 pm EDT | Arty StraehlaChief Executive Officer, Director | 1,332 | $15.00 | $19,980 | 1,332 | — | plan? |
| Oct 19, 2016 AForm 4 → | Oct 21, 6:55 pm EDT | Andre WeissDirector | 6,667 | — | — | 6,667 | — | plan? |
| Oct 19, 2016 AForm 4 → | Oct 21, 4:22 pm EDT | Marc T McCarthyDirector | 6,667 | — | — | 6,667 | — | plan? |
| Oct 19, 2016 SForm 4 → | Oct 21, 4:12 pm EDT | Mammoth Energy Holdings LLC +4Director, 10% Owner | 171,797 | $14.06 | $2,415,895 | 20,445,923 | −0.83% | plan? |
| Jan 9, 2016 AForm 4 → | Jan 10, 2017, 6:26 pm EST | Paul K Heerwagen IVDirector | 4,444 | — | — | 4,444 | — | plan? late |
Reported at this company — derivatives (options, RSUs, warrants)
No reported derivative activity in this period.