← All stocks

MAMMOTH ENERGY SERVICES, INC.

TUSK Net selling

CIK 0001679268 #4104 in the set updated 22 Sep 2026

Bought (120 mo)

$11.42M

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

−$163.11M

−$163.11M against sales at will

By person

19 insiders · 70 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%

$65.94M

+7.5%

GULFPORT ENERGY CORP entity

Director

—

$52.56M (3)

−$52.56M

9,836,215

20.44%

$29.51M

−12.7%

WEXFORD CAPITAL LP entity

Chief Business Officer

$10.99M (11)

—

+$10.99M

34,117,096

70.89%

$102.35M

+48.6%

Straehla Arty

Chief Executive Officer

$29.99K (3)

$3.15M (13)

−$3.12M

1,015,231

2.11%

$3.05M

+76,119%

Mammoth Energy Holdings LLC entity

Director

—

$2.42M (1)

−$2.42M

20,445,923

42.48%

$61.34M

−0.8%

Layton Mark E.

CFO and Secretary

$45.00K (1)

$535.97K (6)

−$490.97K

418,985

0.8706%

$1.26M

—

SMITH ARTHUR L

Director

$177.26K (3)

$503.47K (5)

−$326.22K

130,034

0.2702%

$390.10K

—

Booker Corey J.

Director

—

$176.28K (9)

−$176.28K

125,488

0.2607%

$376.46K

—

Amron Arthur H

Director

$83.58K (9)

—

+$83.58K

96,585

0.2007%

$289.76K

—

Palm James D

Director

$76.52K (2)

—

+$76.52K

240,144

0.4990%

$720.43K

+3,484%

Plaumann Mark Lawrence

Director

$15.00K (1)

—

+$15.00K

5,000

0.0104%

$15.00K

—

Ross Matthew

Director

—

$4.20K (1)

−$4.20K

19,815

0.0412%

$59.45K

—

DAVIDSON CHARLES E

10% owner

—

6,470,441

13.44%

$19.41M

—

Lancaster Phillip

Director

—

159,445

0.3313%

$478.34K

+74.7%

YELLEN JONATHAN H

Director

—

36,674

0.0762%

$110.02K

—

Jacobi Paul M.

Chief Business Officer

—

31,067

0.0646%

$93.20K

—

Heerwagen Paul K IV

Director

—

10,493

0.0218%

$31.48K

—

Gaydosik Aaron

Director

—

6,667

0.0139%

$20.00K

—

Weiss Andre

Director

—

6,667

0.0139%

$20.00K

—

Individual transactions

Nothing of that kind in this period.

What was left out

Form 4 filings counted 106

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