Mammoth Energy Services, Inc. insiders have been one-way buyers this past year: three people put roughly $10.5 million into the stock and nobody sold on the open market.
Wexford GP LLC (Executive Officer) made the biggest buy, worth around $10.5 million.
Looking at the quarterly pattern: 2 quarters in a row of net buying by insiders. Insiders bought in 3 of the last 7 full quarters. 94 investment managers listed TUSK in their latest 13F filings (Q2 2026); more funds bought than sold.
| Filed | Insider | Role | Type | Shares | Price | Value | Source |
|---|---|---|---|---|---|---|---|
| Sep 17, 2026 | Plaumann Mark Lawrence | Director | Buy | 5,000 | $3.00 | $15K | SEC |
| Jun 22, 2026 | Wexford GP LLC | Executive Officer | Buy | 4,019,574 | $2.60 | $10.5M | SEC |
| Jun 15, 2026 | Amron Arthur H | Director | Buy | 2,500 | $3.22 | $8K | SEC |
| Jun 15, 2026 | Amron Arthur H | Director | Buy | 2,000 | $3.28 | $7K | SEC |
| May 28, 2026 | Amron Arthur H | Director | Buy | 2,500 | $3.24 | $8K | SEC |
| May 28, 2026 | Amron Arthur H | Director | Buy | 3,000 | $3.25 | $10K | SEC |
| Dec 15, 2025 | Amron Arthur H | Director | Buy | 10,000 | $1.89 | $19K | SEC |
| May 27, 2025 | SMITH ARTHUR L | Director | Sell | 20,000 | $2.51 | $50K | SEC |
| May 21, 2025 | SMITH ARTHUR L | Director | Sell | 15,000 | $2.49 | $37K | SEC |
| May 21, 2025 | SMITH ARTHUR L | Director | Sell | 50,000 | $2.51 | $126K | SEC |
| Dec 16, 2024 | Amron Arthur H | Director | Buy | 1,000 | $2.97 | $3K | SEC |
| Nov 26, 2024 | Booker Corey J. | Director | Sell | 15,000 | $3.47 | $52K | SEC |
| Nov 26, 2024 | Booker Corey J. | Director | Sell | 10,000 | $3.43 | $34K | SEC |
| Nov 22, 2024 | Booker Corey J. | Director | Sell | 5,000 | $3.21 | $16K | SEC |
| Nov 22, 2024 | Booker Corey J. | Director | Sell | 6,709 | $3.25 | $22K | SEC |
In the last 12 months Mammoth Energy Services, Inc. insiders made open-market purchases worth about $10.5 million and sales worth about $0. Data comes from SEC Form 4 filings, updated every 30 minutes on CapitalSnitch.
The most recent open-market insider trade in TUSK was filed on 2026-09-17.
94 investment managers reported holding TUSK in SEC Form 13F filings for Q2 2026.
No congressional trades in TUSK were reported in the past two years. The full list is free on CapitalSnitch.
Public-record data for research and education, not investment advice. Insider sales are often pre-planned (10b5-1). Congress data: Data derived from public disclosures filed under the Ethics in Government Act and the STOCK Act, republished free for public transparency and news reporting. Disclosures may lag the trade by 45 days or more and show amounts only as ranges. This data may not be used for credit rating, loan underwriting, solicitation of money (political, charitable or other), direct-mail or commercial targeting (5 U.S.C. 13107).