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MAMMOTH ENERGY SERVICES, INC.

TUSK Net selling
CIK 0001679268 #4104 in the set updated 17 Sep 2026
Bought (120 mo)
$11.41M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$174.53M
$0.00 on a plan · $0.00 straight out of an exercise
Sold at will
$174.53M
40 of 40 sales
Net
−$163.13M
−$163.13M against sales at will

By person

18 insiders · 69 transactions
Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
MEH SUB LLC entity
Director
—
$115.19M (2)
−$115.19M
21,978,893
45.67%
$57.24M
+7.5%
GULFPORT ENERGY CORP entity
Director
—
$52.56M (3)
−$52.56M
9,836,215
20.44%
$25.62M
−12.7%
WEXFORD CAPITAL LP entity
Chief Business Officer
$10.99M (11)
—
+$10.99M
34,117,096
70.89%
$88.85M
+48.6%
Straehla Arty
Chief Executive Officer
$29.99K (3)
$3.15M (13)
−$3.12M
1,015,231
2.11%
$2.64M
+76,119%
Mammoth Energy Holdings LLC entity
Director
—
$2.42M (1)
−$2.42M
20,445,923
42.48%
$53.25M
−0.8%
Layton Mark E.
CFO and Secretary
$45.00K (1)
$535.97K (6)
−$490.97K
418,985
0.8706%
$1.09M
—
SMITH ARTHUR L
Director
$177.26K (3)
$503.47K (5)
−$326.22K
130,034
0.2702%
$338.65K
—
Booker Corey J.
Director
—
$176.28K (9)
−$176.28K
125,488
0.2607%
$326.81K
—
Amron Arthur H
Director
$83.58K (9)
—
+$83.58K
96,585
0.2007%
$251.54K
—
Palm James D
Director
$76.52K (2)
—
+$76.52K
240,144
0.4990%
$625.41K
+3,484%
Ross Matthew
Director
—
$4.20K (1)
−$4.20K
19,815
0.0412%
$51.60K
—
DAVIDSON CHARLES E
10% owner
—
—
—
6,470,441
13.44%
$16.85M
—
Lancaster Phillip
Director
—
—
—
159,445
0.3313%
$415.24K
+74.7%
YELLEN JONATHAN H
Director
—
—
—
36,674
0.0762%
$95.51K
—
Jacobi Paul M.
Chief Business Officer
—
—
—
31,067
0.0646%
$80.91K
—
Heerwagen Paul K IV
Director
—
—
—
10,493
0.0218%
$27.33K
—
Gaydosik Aaron
Director
—
—
—
6,667
0.0139%
$17.36K
—
Weiss Andre
Director
—
—
—
6,667
0.0139%
$17.36K
—

Individual transactions

69
Insider
Date
Role
Action
Shares
Price
Amount
WEXFORD CAPITAL LP
17 Jun 2026
Chief Business Officer
Buy indirect
4,019,574
$2.60
$10.47M
Amron Arthur H
12 Jun 2026
Director
Buy
2,000
$3.28
$6.56K
Amron Arthur H
11 Jun 2026
Director
Buy
2,500
$3.22
$8.05K
Amron Arthur H
28 May 2026
Director
Buy
3,000
$3.25
$9.75K
Amron Arthur H
26 May 2026
Director
Buy
2,500
$3.24
$8.10K
Amron Arthur H
11 Dec 2025
Director
Buy
10,000
$1.89
$18.90K
SMITH ARTHUR L
22 May 2025
Director
Sell
20,000
$2.51
$50.20K
SMITH ARTHUR L
20 May 2025
Director
Sell
50,000
$2.51
$125.50K
SMITH ARTHUR L
19 May 2025
Director
Sell
15,000
$2.49
$37.35K
Amron Arthur H
12 Dec 2024
Director
Buy
1,000
$2.97
$2.97K
Booker Corey J.
25 Nov 2024
Director
Sell
15,000
$3.47
$52.05K
Booker Corey J.
22 Nov 2024
Director
Sell
10,000
$3.43
$34.30K
Booker Corey J.
21 Nov 2024
Director
Sell
6,709
$3.25
$21.80K
Booker Corey J.
20 Nov 2024
Director
Sell
5,000
$3.21
$16.05K
Booker Corey J.
14 Nov 2024
Director
Sell
3,607
$3.50
$12.62K
Booker Corey J.
13 Nov 2024
Director
Sell
7,100
$3.68
$26.10K
Booker Corey J.
11 Nov 2024
Director
Sell
3,494
$3.61
$12.61K
Booker Corey J.
8 Nov 2024
Director
Sell
24
$3.76
$90.24
Booker Corey J.
7 Nov 2024
Director
Sell
165
$3.90
$643.50
Amron Arthur H
30 May 2024
Director
Buy
3,000
$3.65
$10.94K
Amron Arthur H
28 May 2024
Director
Buy
2,000
$3.57
$7.15K
Amron Arthur H
12 Mar 2024
Director
Buy
3,000
$3.72
$11.16K
Straehla Arty
19 Dec 2023
Chief Executive Officer
Sell
40,000
$4.35
$174.16K
Straehla Arty
18 Dec 2023
Chief Executive Officer
Sell
30,000
$4.38
$131.28K
Straehla Arty
15 Dec 2023
Chief Executive Officer
Sell
40,000
$4.36
$174.44K
Straehla Arty
14 Dec 2023
Chief Executive Officer
Sell
55,000
$4.44
$244.15K
Straehla Arty
13 Dec 2023
Chief Executive Officer
Sell
25,000
$4.39
$109.65K
SMITH ARTHUR L
11 Nov 2022
Director
Sell
20,000
$7.07
$141.32K
WEXFORD CAPITAL LP
17 Jun 2022
Director
Buy indirect
10,382
$2.17
$22.58K
WEXFORD CAPITAL LP
16 Jun 2022
Director
Buy indirect
35,000
$2.13
$74.40K
WEXFORD CAPITAL LP
15 Jun 2022
Director
Buy indirect
5,100
$2.23
$11.38K
WEXFORD CAPITAL LP
14 Jun 2022
Director
Buy indirect
20,600
$2.28
$46.97K
WEXFORD CAPITAL LP
13 Jun 2022
Director
Buy indirect
25,102
$2.35
$59.00K
WEXFORD CAPITAL LP
10 Jun 2022
Director
Buy indirect
54,779
$2.46
$134.51K
WEXFORD CAPITAL LP
9 Jun 2022
Director
Buy indirect
27,489
$2.48
$68.16K
WEXFORD CAPITAL LP
8 Jun 2022
Director
Buy indirect
15,500
$2.50
$38.71K
Layton Mark E.
10 Mar 2022
CFO and Secretary
Sell
40,417
$2.04
$82.33K
SMITH ARTHUR L
13 Dec 2021
Director
Buy
25,000
$2.00
$50.00K
Layton Mark E.
11 Mar 2021
CFO and Secretary
Sell
55,789
$5.22
$290.98K
Straehla Arty
10 Mar 2021
Chief Executive Officer
Sell
102,435
$5.29
$541.58K
Straehla Arty
9 Mar 2021
Chief Executive Officer
Sell
46,555
$5.47
$254.49K
Straehla Arty
10 Nov 2020
Chief Executive Officer
Sell
5,000
$1.78
$8.88K
SMITH ARTHUR L
4 Sep 2020
Director
Buy
20,000
$1.29
$25.80K
Ross Matthew
21 Nov 2019
Director
Sell
2,913
$1.44
$4.20K
WEXFORD CAPITAL LP
20 Nov 2019
Director
Buy indirect
16,692
$1.33
$22.17K
WEXFORD CAPITAL LP
13 Nov 2019
Director
Buy indirect
35,904
$1.36
$48.89K
SMITH ARTHUR L
3 Dec 2018
Director
Sell indirect
6,000
$24.85
$149.10K
Straehla Arty
12 Nov 2018
Chief Executive Officer
Sell
2,230
$26.20
$58.43K
Layton Mark E.
9 Nov 2018
CFO and Secretary
Sell
142
$26.12
$3.71K
Layton Mark E.
8 Nov 2018
CFO and Secretary
Sell
994
$27.27
$27.11K
Straehla Arty
8 Nov 2018
Chief Executive Officer
Sell
11,460
$27.29
$312.72K
Straehla Arty
8 Nov 2018
Chief Executive Officer
Sell
25,151
$26.45
$665.29K
MEH SUB LLC
30 Jul 2018
Director
Sell
266,026
$38.01
$10.11M
GULFPORT ENERGY CORP
30 Jul 2018
Director
Sell
118,974
$38.01
$4.52M
MEH SUB LLC
29 Jun 2018
Director
Sell
2,764,400
$38.01
$105.07M
GULFPORT ENERGY CORP
29 Jun 2018
Director
Sell
1,235,600
$38.01
$46.97M
Layton Mark E.
1 Mar 2018
CFO and Secretary
Sell
4,373
$26.13
$114.25K
Straehla Arty
15 Nov 2017
Chief Executive Officer
Sell
7,553
$17.81
$134.51K
Straehla Arty
14 Nov 2017
Chief Executive Officer
Sell
18,289
$18.71
$342.25K
Layton Mark E.
14 Nov 2017
CFO and Secretary
Sell
925
$19.01
$17.59K
Palm James D
25 Aug 2017
Director
Buy
2,000
$12.60
$25.20K
Palm James D
24 Aug 2017
Director
Buy
4,000
$12.83
$51.32K
SMITH ARTHUR L
9 Jun 2017
Director
Buy indirect
6,000
$16.91
$101.46K
Straehla Arty
28 Feb 2017
Chief Executive Officer
Buy indirect
460
$21.76
$10.01K
Mammoth Energy Holdings LLC
19 Oct 2016
Director
Sell
171,797
$14.06
$2.42M
Straehla Arty
19 Oct 2016
Chief Executive Officer
Buy indirect
666
$15.00
$9.99K
Straehla Arty
19 Oct 2016
Chief Executive Officer
Buy indirect
666
$15.00
$9.99K
Layton Mark E.
19 Oct 2016
CFO and Secretary
Buy
3,000
$15.00
$45.00K
GULFPORT ENERGY CORP
19 Oct 2016
Director
Sell
76,250
$14.06
$1.07M

What was left out

Form 4 filings counted 105
Amendments (4/A) skipped 0
Filings about a different issuer 0
Unreadable filings 0
Joint filings 13
Sales on a Rule 10b5-1 plan 0
Sales straight out of an exercise 0
Sales at will 40
Transactions with no price 0
Shares from compensation/vesting 22,550,298
Sales filed before the plan box existed 23
History held since 21 Oct 2016