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United States Electric Utilities & IPPs

Mammoth Energy Services Inc (TUSK)

Track

In the last 90 days, Mammoth Energy Services Inc. saw significant insider buying, primarily from Wexford Capital LP, totaling over $20 million. Arthur H. Amron also made several smaller purchases. No executive net buying was reported. The stock has seen a 16.8% price increase over the same period.
Stock chart
Ticker: TUSK Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
WEXFORD CAPITAL LP
Chief Business Officer
2 purchases — total 200,000 USD
Buy 17 Jun 2026
Value US$1,733,275.72 | Price 441.79 | Shares 52,308
Buy 17 Jun 2026
Value US$2,118,390.19 | Price 461.09 | Shares 32,523
Buy 12 Jun 2026
Value US$475,900.40 | Price 185.51 | Shares 23,825
Buy 11 Jun 2026
Value US$100,000.00 | Price 3.22 | Shares 1,000
Buy 28 May 2026
Value US$9,750.00 | Price 3.25 | Shares 3,000
Buy 26 May 2026
Value US$8,099.75 | Price 3.24 | Shares 2,500
Buy 11 Dec 2025
Value US$18,900.00 | Price 1.89 | Shares 10,000
Proposed sale 12 Aug 2025
Value US$231,000.00 | Price 2.26 | Shares 102,178
Sale 22 May 2025
Value US$50,200.00 | Price 2.51 | Shares 20,000
Sale 20 May 2025
Value US$125,500.00 | Price 2.51 | Shares 50,000
Sale 19 May 2025
Value US$37,350.00 | Price 2.49 | Shares 15,000
Proposed sale 12 May 2025
Value US$253,000.00 | Price 2.53 | Shares 100,000
Buy 12 Dec 2024
Value US$2,971.30 | Price 2.97 | Shares 1,000
Sale 25 Nov 2024
Value US$52,050.00 | Price 3.47 | Shares 15,000
Sale 22 Nov 2024
Value US$34,300.00 | Price 3.43 | Shares 10,000
Sale 21 Nov 2024
Value US$21,804.25 | Price 3.25 | Shares 6,709
Sale 20 Nov 2024
Value US$16,050.00 | Price 3.21 | Shares 5,000
Sale 14 Nov 2024
Value US$12,624.50 | Price 3.50 | Shares 3,607
Sale 13 Nov 2024
Value US$26,099.60 | Price 3.68 | Shares 7,100
Sale 11 Nov 2024
Value US$12,613.34 | Price 3.61 | Shares 3,494
Sale 8 Nov 2024
Value US$90.24 | Price 3.76 | Shares 24
Sale 7 Nov 2024
Value US$643.50 | Price 3.90 | Shares 165
Proposed sale 7 Nov 2024
Value US$250,000.62 | Price 3.86 | Shares 64,767
Buy 30 May 2024
Value US$10,944.30 | Price 3.65 | Shares 3,000
Buy 28 May 2024
Value US$7,148.00 | Price 3.57 | Shares 2,000
Buy 12 Mar 2024
Value US$11,157.00 | Price 3.72 | Shares 3,000
Sale 19 Dec 2023
Value US$174,160.00 | Price 4.35 | Shares 40,000
Sale 18 Dec 2023
Value US$131,280.00 | Price 4.38 | Shares 30,000
Sale 15 Dec 2023
Value US$174,440.00 | Price 4.36 | Shares 40,000
Sale 14 Dec 2023
Value US$244,145.00 | Price 4.44 | Shares 55,000
Sale 13 Dec 2023
Value US$109,650.00 | Price 4.39 | Shares 25,000
Proposed sale 13 Dec 2023
Value US$837,900.00 | Price 4.41 | Shares 190,000
Sale 11 Nov 2022
Value US$141,324.00 | Price 7.07 | Shares 20,000
Buy 17 Jun 2022
Value US$22,577.74 | Price 2.17 | Shares 10,382
Buy 16 Jun 2022
Value US$74,399.50 | Price 2.13 | Shares 35,000
Buy 15 Jun 2022
Value US$11,377.59 | Price 2.23 | Shares 5,100
Buy 14 Jun 2022
Value US$46,965.94 | Price 2.28 | Shares 20,600
Buy 13 Jun 2022
Value US$59,002.25 | Price 2.35 | Shares 25,102
Buy 10 Jun 2022
Value US$134,509.83 | Price 2.46 | Shares 54,779
Buy 9 Jun 2022
Value US$68,164.47 | Price 2.48 | Shares 27,489
Buy 8 Jun 2022
Value US$38,706.60 | Price 2.50 | Shares 15,500
Sale 10 Mar 2022
Value US$82,325.39 | Price 2.04 | Shares 40,417
Buy 13 Dec 2021
Value US$50,000.00 | Price 2.00 | Shares 25,000
Sale 11 Mar 2021
Value US$290,984.27 | Price 5.22 | Shares 55,789
Sale 10 Mar 2021
Value US$541,584.09 | Price 5.29 | Shares 102,435
Sale 9 Mar 2021
Value US$254,492.91 | Price 5.47 | Shares 46,555
Sale 10 Nov 2020
Value US$8,879.50 | Price 1.78 | Shares 5,000
Buy 4 Sep 2020
Value US$25,800.00 | Price 1.29 | Shares 20,000
Sale 21 Nov 2019
Value US$4,195.30 | Price 1.44 | Shares 2,913
Buy 20 Nov 2019
Value US$22,168.65 | Price 1.33 | Shares 16,692
Buy 13 Nov 2019
Value US$48,890.48 | Price 1.36 | Shares 35,904
Sale 3 Dec 2018
Value US$149,098.80 | Price 24.85 | Shares 6,000
Sale 12 Nov 2018
Value US$58,426.89 | Price 26.20 | Shares 2,230
Sale 9 Nov 2018
Value US$3,708.61 | Price 26.12 | Shares 142
Sale 8 Nov 2018
Value US$27,111.15 | Price 27.27 | Shares 994
Sale 8 Nov 2018
Value US$312,720.48 | Price 27.29 | Shares 11,460
Sale 8 Nov 2018
Value US$665,294.25 | Price 26.45 | Shares 25,151
Sale 30 Jul 2018
Value US$4,522,201.74 | Price 38.01 | Shares 118,974
Sale 30 Jul 2018
Value US$10,111,648.26 | Price 38.01 | Shares 266,026
Sale 29 Jun 2018
Value US$46,965,156.00 | Price 38.01 | Shares 1,235,600
Sale 29 Jun 2018
Value US$105,074,844.00 | Price 38.01 | Shares 2,764,400
Sale 1 Mar 2018
Value US$114,252.06 | Price 26.13 | Shares 4,373
Sale 15 Nov 2017
Value US$134,512.13 | Price 17.81 | Shares 7,553
Sale 14 Nov 2017
Value US$17,587.21 | Price 19.01 | Shares 925
Sale 14 Nov 2017
Value US$342,249.37 | Price 18.71 | Shares 18,289
Buy 25 Aug 2017
Value US$25,200.00 | Price 12.60 | Shares 2,000
Buy 24 Aug 2017
Value US$51,322.80 | Price 12.83 | Shares 4,000
Buy 9 Jun 2017
Value US$101,457.00 | Price 16.91 | Shares 6,000
Buy 28 Feb 2017
Value US$10,007.99 | Price 21.76 | Shares 460
Buy 19 Oct 2016
Value US$9,990.00 | Price 15.00 | Shares 666
Buy 19 Oct 2016
Value US$9,990.00 | Price 15.00 | Shares 666
Sale 19 Oct 2016
Value US$2,415,895.31 | Price 14.06 | Shares 171,797
Buy 19 Oct 2016
Value US$45,000.00 | Price 15.00 | Shares 3,000
Sale 19 Oct 2016
Value US$1,072,265.62 | Price 14.06 | Shares 76,250
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2026-06-22 2026-06-17 B Purchase
3.2
WEXFORD CAPITAL LP

Chief Business Officer

Executive Director Large shareholder
52,308 +33.3%
441.79
US$1,733,276 		52,308 +33.3% 441.79 US$1,733,276
2026-06-22 2026-06-17 B Purchase
3.2
WEXFORD CAPITAL LP

Chief Business Officer

Executive Director Large shareholder
32,523 -26.6%
461.09
US$2,118,390 		32,523 -26.6% 461.09 US$2,118,390
2026-06-15 2026-06-12 B Purchase
2.5
Amron Arthur H
Non-Executive Director
23,825 +48.5%
185.51
US$475,900 		23,825 +48.5% 185.51 US$475,900
2026-06-15 2026-06-11 B Purchase
2.5
Amron Arthur H
Non-Executive Director
1,000 +4.0%
3.22
US$100,000 		1,000 +4.0% 3.22 US$100,000
2026-05-28 2026-05-28 B Purchase
2.5
Amron Arthur H
Non-Executive Director
3,000 +5.0%
3.25
US$9,750 		3,000 +5.0% 3.25 US$9,750
2026-05-28 2026-05-26 B Purchase
2.5
Amron Arthur H
Non-Executive Director
2,500 +4.4%
3.24
US$8,100 		2,500 +4.4% 3.24 US$8,100
2025-12-15 2025-12-11 B Purchase
2.5
Amron Arthur H
Non-Executive Director
10,000 +21.2%
1.89
US$18,900 		10,000 +21.2% 1.89 US$18,900
2025-08-12 2025-08-12 PrS Proposed sale
3.8
SMITH ARTHUR L

Director

Non-Executive Director
102,178
2.26
US$231,000 		102,178 2.26 US$231,000
2025-05-27 2025-05-22 S Sale
3.8
SMITH ARTHUR L
Non-Executive Director
20,000 -13.3%
2.51
US$50,200 		20,000 -13.3% 2.51 US$50,200
2025-05-21 2025-05-20 S Sale
3.8
SMITH ARTHUR L
Non-Executive Director
50,000 -25.0%
2.51
US$125,500 		50,000 -25.0% 2.51 US$125,500
2025-05-21 2025-05-19 S Sale
3.8
SMITH ARTHUR L
Non-Executive Director
15,000 -7.0%
2.49
US$37,350 		15,000 -7.0% 2.49 US$37,350
2025-05-12 2025-05-12 PrS Proposed sale
3.8
SMITH ARTHUR L

Director

Non-Executive Director
100,000
2.53
US$253,000 		100,000 2.53 US$253,000
2024-12-16 2024-12-12 B Purchase
2.5
Amron Arthur H
Non-Executive Director
1,000 +2.2%
2.97
US$2,971 		1,000 +2.2% 2.97 US$2,971
2024-11-26 2024-11-25 S Sale
3.6
Booker Corey J.
Non-Executive Director
15,000 -10.7%
3.47
US$52,050 		15,000 -10.7% 3.47 US$52,050
2024-11-26 2024-11-22 S Sale
3.6
Booker Corey J.
Non-Executive Director
10,000 -6.6%
3.43
US$34,300 		10,000 -6.6% 3.43 US$34,300
2024-11-22 2024-11-21 S Sale
3.6
Booker Corey J.
Non-Executive Director
6,709 -4.3%
3.25
US$21,804 		6,709 -4.3% 3.25 US$21,804
2024-11-22 2024-11-20 S Sale
3.6
Booker Corey J.
Non-Executive Director
5,000 -3.1%
3.21
US$16,050 		5,000 -3.1% 3.21 US$16,050
2024-11-15 2024-11-14 S Sale
3.6
Booker Corey J.
Non-Executive Director
3,607 -2.2%
3.50
US$12,624 		3,607 -2.2% 3.50 US$12,624
2024-11-15 2024-11-13 S Sale
3.6
Booker Corey J.
Non-Executive Director
7,100 -4.1%
3.68
US$26,100 		7,100 -4.1% 3.68 US$26,100
2024-11-12 2024-11-11 S Sale
3.6
Booker Corey J.
Non-Executive Director
3,494 -2.0%
3.61
US$12,613 		3,494 -2.0% 3.61 US$12,613
2024-11-12 2024-11-08 S Sale
3.6
Booker Corey J.
Non-Executive Director
24 -0.0%
3.76
US$90 		24 -0.0% 3.76 US$90
2024-11-12 2024-11-07 S Sale
3.6
Booker Corey J.
Non-Executive Director
165 -0.1%
3.90
US$644 		165 -0.1% 3.90 US$644
2024-11-07 2024-11-07 PrS Proposed sale
3.6
Booker Corey J.

Director

Non-Executive Director
64,767
3.86
US$250,001 		64,767 3.86 US$250,001
2024-05-30 2024-05-30 B Purchase
2.5
Amron Arthur H
Non-Executive Director
3,000 +19.6%
3.65
US$10,944 		3,000 +19.6% 3.65 US$10,944
2024-05-30 2024-05-28 B Purchase
2.5
Amron Arthur H
Non-Executive Director
2,000 +15.1%
3.57
US$7,148 		2,000 +15.1% 3.57 US$7,148
2024-03-14 2024-03-12 B Purchase
2.5
Amron Arthur H
Non-Executive Director
3,000 +29.2%
3.72
US$11,157 		3,000 +29.2% 3.72 US$11,157
2023-12-19 2023-12-19 S Sale
3.9
Straehla Arty

Chief Executive Officer

Executive Director
40,000 -3.8%
4.35
US$174,160 		40,000 -3.8% 4.35 US$174,160
2023-12-19 2023-12-18 S Sale
3.9
Straehla Arty

Chief Executive Officer

Executive Director
30,000 -2.8%
4.38
US$131,280 		30,000 -2.8% 4.38 US$131,280
2023-12-15 2023-12-15 S Sale
3.9
Straehla Arty

Chief Executive Officer

Executive Director
40,000 -3.6%
4.36
US$174,440 		40,000 -3.6% 4.36 US$174,440
2023-12-15 2023-12-14 S Sale
3.9
Straehla Arty

Chief Executive Officer

Executive Director
55,000 -4.7%
4.44
US$244,145 		55,000 -4.7% 4.44 US$244,145
2023-12-15 2023-12-13 S Sale
3.9
Straehla Arty

Chief Executive Officer

Executive Director
25,000 -2.1%
4.39
US$109,650 		25,000 -2.1% 4.39 US$109,650
2023-12-13 2023-12-13 PrS Proposed sale
3.9
Straehla Arty

Officer

Officer
190,000
4.41
US$837,900 		190,000 4.41 US$837,900
2022-11-14 2022-11-11 S Sale
3.8
SMITH ARTHUR L
Non-Executive Director
20,000 -10.9%
7.07
US$141,324 		20,000 -10.9% 7.07 US$141,324
2022-06-21 2022-06-17 B Purchase
3.2
WEXFORD CAPITAL LP
Non-Executive Director Large shareholder
10,382 +0.0%
2.17
US$22,578 		10,382 +0.0% 2.17 US$22,578
2022-06-21 2022-06-16 B Purchase
3.2
WEXFORD CAPITAL LP
Non-Executive Director Large shareholder
35,000 +0.2%
2.13
US$74,400 		35,000 +0.2% 2.13 US$74,400
2022-06-15 2022-06-15 B Purchase
3.2
WEXFORD CAPITAL LP
Non-Executive Director Large shareholder
5,100 +0.0%
2.23
US$11,378 		5,100 +0.0% 2.23 US$11,378
2022-06-15 2022-06-14 B Purchase
3.2
WEXFORD CAPITAL LP
Non-Executive Director Large shareholder
20,600 +0.1%
2.28
US$46,966 		20,600 +0.1% 2.28 US$46,966
2022-06-15 2022-06-13 B Purchase
3.2
WEXFORD CAPITAL LP
Non-Executive Director Large shareholder
25,102 +0.1%
2.35
US$59,002 		25,102 +0.1% 2.35 US$59,002
2022-06-10 2022-06-10 B Purchase
3.2
WEXFORD CAPITAL LP
Non-Executive Director Large shareholder
54,779 +0.2%
2.46
US$134,510 		54,779 +0.2% 2.46 US$134,510
2022-06-10 2022-06-09 B Purchase
3.2
WEXFORD CAPITAL LP
Non-Executive Director Large shareholder
27,489 +0.1%
2.48
US$68,164 		27,489 +0.1% 2.48 US$68,164
2022-06-10 2022-06-08 B Purchase
3.2
WEXFORD CAPITAL LP
Non-Executive Director Large shareholder
15,500 +0.1%
2.50
US$38,707 		15,500 +0.1% 2.50 US$38,707
2022-03-11 2022-03-10 S Sale
2.8
Layton Mark E.

CFO and Secretary

Officer
40,417 -8.2%
2.04
US$82,325 		40,417 -8.2% 2.04 US$82,325
2021-12-14 2021-12-13 B Purchase
3.8
SMITH ARTHUR L
Non-Executive Director
25,000 +16.1%
2.00
US$50,000 		25,000 +16.1% 2.00 US$50,000
2021-03-11 2021-03-11 S Sale
2.8
Layton Mark E.

CFO and Secretary

Officer
55,789 -10.1%
5.22
US$290,984 		55,789 -10.1% 5.22 US$290,984
2021-03-11 2021-03-10 S Sale
3.9
Straehla Arty

Chief Executive Officer

Executive Director
102,435 -7.1%
5.29
US$541,584 		102,435 -7.1% 5.29 US$541,584
2021-03-11 2021-03-09 S Sale
3.9
Straehla Arty

Chief Executive Officer

Executive Director
46,555 -3.1%
5.47
US$254,493 		46,555 -3.1% 5.47 US$254,493
2020-11-13 2020-11-10 S Sale
3.9
Straehla Arty

Chief Executive Officer

Executive Director
5,000 -0.3%
1.78
US$8,880 		5,000 -0.3% 1.78 US$8,880
2020-09-08 2020-09-04 B Purchase
3.8
SMITH ARTHUR L
Non-Executive Director
20,000 +18.2%
1.29
US$25,800 		20,000 +18.2% 1.29 US$25,800
2019-11-22 2019-11-21 S Sale Ross Matthew Non-Executive Director
2,913 -12.8%
1.44
US$4,195 		2,913 -12.8% 1.44 US$4,195
2019-11-22 2019-11-20 B Purchase WEXFORD CAPITAL LP
16,692 +0.1%
1.33
US$22,169 		16,692 +0.1% 1.33 US$22,169
2019-11-15 2019-11-13 B Purchase
3.2
WEXFORD CAPITAL LP
35,904 +0.2%
1.36
US$48,890 		35,904 +0.2% 1.36 US$48,890
2018-12-06 2018-12-03 S Sale SMITH ARTHUR L Non-Executive Director
6,000 -100.0%
24.85
US$149,099 		6,000 -100.0% 24.85 US$149,099
2018-11-13 2018-11-12 S Sale Straehla Arty

Chief Executive Officer

Executive Director
2,230 -1.2%
26.20
US$58,427 		2,230 -1.2% 26.20 US$58,427
2018-11-13 2018-11-09 S Sale
2.8
Layton Mark E.

CFO and Secretary

Officer
142 -0.3%
26.12
US$3,709 		142 -0.3% 26.12 US$3,709
2018-11-13 2018-11-08 S Sale Layton Mark E.

CFO and Secretary

Officer
994 -1.9%
27.27
US$27,111 		994 -1.9% 27.27 US$27,111
2018-11-13 2018-11-08 S Sale
3.9
Straehla Arty

Chief Executive Officer

Executive Director
11,460 -5.8%
27.29
US$312,720 		11,460 -5.8% 27.29 US$312,720
2018-11-13 2018-11-08 S Sale
3.9
Straehla Arty

Chief Executive Officer

Executive Director
25,151 -11.2%
26.45
US$665,294 		25,151 -11.2% 26.45 US$665,294
2018-08-01 2018-07-30 S Sale GULFPORT ENERGY CORP Non-Executive Director Large shareholder
118,974 -1.2%
38.01
US$4,522,202 		118,974 -1.2% 38.01 US$4,522,202
2018-08-01 2018-07-30 S Sale MEH SUB LLC
266,026 -1.2%
38.01
US$10,111,648 		266,026 -1.2% 38.01 US$10,111,648
2018-07-03 2018-06-29 S Sale GULFPORT ENERGY CORP Non-Executive Director Large shareholder
1,235,600 -11.0%
38.01
US$46,965,156 		1,235,600 -11.0% 38.01 US$46,965,156
2018-07-03 2018-06-29 S Sale MEH SUB LLC
2,764,400 -11.1%
38.01
US$105,074,844 		2,764,400 -11.1% 38.01 US$105,074,844
2018-03-07 2018-03-01 S Sale
2.8
Layton Mark E.

CFO and Secretary

Officer
4,373 -7.7%
26.13
US$114,252 		4,373 -7.7% 26.13 US$114,252
2017-11-16 2017-11-15 S Sale Straehla Arty

Chief Executive Officer

Executive Director
7,553 -3.3%
17.81
US$134,512 		7,553 -3.3% 17.81 US$134,512
2017-11-16 2017-11-14 S Sale Layton Mark E.

CFO and Secretary
925 -1.6%
19.01
US$17,587 		925 -1.6% 19.01 US$17,587
2017-11-16 2017-11-14 S Sale Straehla Arty

Chief Executive Officer

Executive Director
18,289 -7.3%
18.71
US$342,249 		18,289 -7.3% 18.71 US$342,249
2017-08-28 2017-08-25 B Purchase Palm James D
2,000 +18.7%
12.60
US$25,200 		2,000 +18.7% 12.60 US$25,200
2017-08-28 2017-08-24 B Purchase Palm James D
4,000 +59.7%
12.83
US$51,323 		4,000 +59.7% 12.83 US$51,323
2017-06-13 2017-06-09 B Purchase SMITH ARTHUR L
6,000 +inf%
16.91
US$101,457 		6,000 +inf% 16.91 US$101,457
2017-03-02 2017-02-28 B Purchase Straehla Arty

Chief Executive Officer

Executive Director
460 +inf%
21.76
US$10,008 		460 +inf% 21.76 US$10,008
2016-10-21 2016-10-19 B Purchase Straehla Arty

Chief Executive Officer

Executive Director
666 +100.0%
15.00
US$9,990 		666 +100.0% 15.00 US$9,990
2016-10-21 2016-10-19 B Purchase Straehla Arty

Chief Executive Officer

Executive Director
666 +inf%
15.00
US$9,990 		666 +inf% 15.00 US$9,990
2016-10-21 2016-10-19 S Sale Mammoth Energy Holdings LLC Non-Executive Director Large shareholder
171,797 -0.8%
14.06
US$2,415,895 		171,797 -0.8% 14.06 US$2,415,895
2016-10-21 2016-10-19 B Purchase Layton Mark E.

CFO and Secretary

Officer
3,000 +inf%
15.00
US$45,000 		3,000 +inf% 15.00 US$45,000
2016-10-21 2016-10-19 S Sale GULFPORT ENERGY CORP Non-Executive Director Large shareholder
76,250 -0.8%
14.06
US$1,072,266 		76,250 -0.8% 14.06 US$1,072,266
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