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Livermore
Livermore
ZHEN

Mammoth Energy Services, Inc.

TUSK
Exchange
Nasdaq
Industry
Oil & Gas Field Services, NEC
SEC CIK
0001679268

In the last 90 days, Mammoth Energy Services, Inc. insiders filed 1 open-market purchase and 0 sales; 93 institutions reported holding it in 13F filings for Q2 2026, worth $84.7M in total; no superinvestor holds it.

Holders of 5% or more of TUSK

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Mammoth Energy Services, Inc., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of TUSK
HolderLatest formStakeChangeFirst filedLatest filingFiling
Wexford Capital LP13G/A25.06%12.1M shares–Feb 5, 20213 filingsJun 22, 2026SEC
Davidson Charles E13G13.43%6.47M sharesNewJun 22, 20261 filingJun 22, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

6 Schedule 13D and 13G filings on Mammoth Energy Services, Inc., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on TUSK
Filed (ET)FilerFormStakeChangeEvent dateFiling
Jun 22, 20265:03 PM ETDavidson Charles Eand 1 other13G13.43%6.47M sharesNewJun 17, 2026SEC
Jun 22, 20265:03 PM ETWexford Capital LPand 3 others13G/A25.06%12.1M shares–Jun 17, 2026SEC
Aug 14, 20257:02 PM ETValueworks LLCand 3 others13G/A4.96%2.39M shares–Below 5%Jun 30, 2025SEC
Feb 9, 2022Wexford Capital LP13G/AOld format–––SEC
Jul 12, 2021GPOR Distribution Trust13DOld format–New–SEC
Feb 5, 2021Wexford Capital LP13G/AOld format–––SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Mammoth Energy Services, Inc. shares.

No Form 144 notices for Mammoth Energy Services, Inc. are on file.