Mammoth Energy Services Inc. (TUSK) Insider Trading

Last 12 months

Insiders bought $10.5M on the open market and sold nothing.

Net open-market

+$10.5M

5 buys · 0 sales

Under a 10b5-1 plan

—

no sales

Insiders who bought / sold

3 / 0

executives and directors

Last open-market buy

Sep 2026

Sep 16, 2026

Get an email when TUSK's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Sep 16	Mark Lawrence Plaumann Director	Bought	5,000	$3.00	$15k	New	Form 4
Jun 17	Wexford GP LLC Chief Business Officer	Bought	4,019,574	$2.60	$10.5M	27%	Form 4
Jun 11 – 12	Arthur H Amron Director	Bought 2 parts	4,500	$3.25 average	$15k	7.2%	Form 4
May 26 – 28	Arthur H Amron Director	Bought 2 parts	5,500	$3.25 average	$18k	9.6%	Form 4
Dec 11, 2025	Arthur H Amron Director	Bought	10,000	$1.89	$19k	21%	Form 4
May 22, 2025	Arthur L Smith Director	SoldNo plan	20,000	$2.51	$50k	13%	Form 4
May 19, 2025 – May 20, 2025	Arthur L Smith Director	SoldNo plan 2 parts	65,000	$2.51 average	$163k	30%	Form 4
Dec 12, 2024	Arthur H Amron Director	Bought	1,000	$2.97	$3k	2.2%	Form 4
Nov 22, 2024 – Nov 25, 2024	Corey J. Booker Director	SoldNo plan 2 parts	25,000	$3.45 average	$86k	17%	Form 4
Nov 20, 2024 – Nov 21, 2024	Corey J. Booker Director	SoldNo plan 2 parts	11,709	$3.23 average	$38k	7.2%	Form 4
Nov 13, 2024 – Nov 14, 2024	Corey J. Booker Director	SoldNo plan 2 parts	10,707	$3.62 average	$39k	6.2%	Form 4
Nov 7, 2024 – Nov 11, 2024	Corey J. Booker Director	SoldNo plan 3 parts	3,683	$3.62 average	$13k	2.1%	Form 4

Sep 16
Mark Lawrence Plaumann
Director · bought 5,000 at $3.00
$15k
New position
Jun 17
Wexford GP LLC
Chief Business Officer · bought 4,019,574 at $2.60
$10.5M
27% of stake
Jun 11 – 12
Arthur H Amron
Director · bought 4,500 at avg $3.25
$15k
7.2% of stake
May 26 – 28
Arthur H Amron
Director · bought 5,500 at avg $3.25
$18k
9.6% of stake
Dec 11, 2025
Arthur H Amron
Director · bought 10,000 at $1.89
$19k
21% of stake
May 22, 2025No plan
Arthur L Smith
Director · sold 20,000 at $2.51
$50k
13% of stake
May 19, 2025 – May 20, 2025No plan
Arthur L Smith
Director · sold 65,000 at avg $2.51
$163k
30% of stake
Dec 12, 2024
Arthur H Amron
Director · bought 1,000 at $2.97
$3k
2.2% of stake
Nov 22, 2024 – Nov 25, 2024No plan
Corey J. Booker
Director · sold 25,000 at avg $3.45
$86k
17% of stake
Nov 20, 2024 – Nov 21, 2024No plan
Corey J. Booker
Director · sold 11,709 at avg $3.23
$38k
7.2% of stake
Nov 13, 2024 – Nov 14, 2024No plan
Corey J. Booker
Director · sold 10,707 at avg $3.62
$39k
6.2% of stake
Nov 7, 2024 – Nov 11, 2024No plan
Corey J. Booker
Director · sold 3,683 at avg $3.62
$13k
2.1% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch TUSK, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in TUSK's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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