Mammoth Energy Services, Inc. (TUSK)
Nasdaq: TUSK · Oil & Gas Field Services, NEC · Oklahoma City, OK · filing with the SEC since 2016
Grade3.9
◀ Past 1.3● Present 4.0▶ Future 6.3
Who owns Mammoth Energy Services, Inc.
As filed with the SECHolders of 5% or more
2
Wexford Capital LP holds 25.1% of Common Stock, $0.01 par value, as its SCHEDULE 13G/A filed Jun 22, 2026 says.
Directors and officers
9
report now, of 26 people on the record since 2016. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 2 named at left.
Holders of 5% or moreshare of the class, as filed
Wexford Capital LP
SCHEDULE 13G/A · filed Jun 22, 2026 · Common Stock, $0.01 par value
Charles E. Davidson
SCHEDULE 13G · filed Jun 22, 2026 · Common Stock, $0.01 par value
Valueworks LLC
SCHEDULE 13G/A · filed Aug 14, 2025 · Common Stock, $0.01 par value · reported falling below 5%
What TUSK reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Brim Acquisitions LLC
An investee · investee · invested in, named in the 10-K filed Mar 6, 2026
Auxiliary Power Unit One
A company bought · asset acquisition · owns, named in the 10-K filed Mar 6, 2026
Auxiliary Power Unit Two
A company bought · asset acquisition · owns, named in the 10-K filed Mar 6, 2026
Rental Equipment
A company bought · asset acquisition · owns, named in the 10-K filed Mar 6, 2026
29 subsidiaries in 0 countries, from the list filed with the 10-K filed Mar 6, 2026.
Insider tradesForm 4
0sales
7purchases
0sales on a scheduled plan
0people selling
$0sold, in dollars
$10.5Mbought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Sep 30, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window3 of 28 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Amron Arthur H | director | 0 | $0 | 0 | 5 | $100,000 |
| Wexford Gp LLC | Chief Business Officer | 0 | $0 | 0 | 1 | $10.5M |
| Plaumann Mark Lawrence | director | 0 | $0 | 0 | 1 | $0 |