Mammoth Energy Services, Inc. (TUSK) Insider Trading
Over the last 3 months, TUSK insiders made 5 open-market buys and 0 sales, a net purchase of $10.5M (SEC Form 4). Multiple insiders bought within days of each other (cluster buying). Over the last 6 months, 47 institutions increased and 48 reduced their position (13F).
Insider Activity
Sentiment
100/100
Buys (3m)
5
Sells (3m)
0
Net (3m)
$10.5M
Insiders buyingCluster buying
Insider trades by month Buys Sells
Nov
Dec
May
Dec
May
Jun
Context3-month price +32.7%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 22, 2026 | WEXFORD CAPITAL LPdirector, 10 percent owner, officer: Chief Business Officer | Buy | 4,019,574 | $2.60 |
| Jun 15, 2026 | Amron Arthur Hdirector | Buy | 2,000 | $3.28 |
| Jun 15, 2026 | Amron Arthur Hdirector | Buy | 2,500 | $3.22 |
| May 28, 2026 | Amron Arthur Hdirector | Buy | 3,000 | $3.25 |
| May 28, 2026 | Amron Arthur Hdirector | Buy | 2,500 | $3.24 |
| Dec 15, 2025 | Amron Arthur Hdirector | Buy | 10,000 | $1.89 |
| May 27, 2025 | SMITH ARTHUR Ldirector | Sell | 20,000 | $2.51 |
| May 21, 2025 | SMITH ARTHUR Ldirector | Sell | 50,000 | $2.51 |
| May 21, 2025 | SMITH ARTHUR Ldirector | Sell | 15,000 | $2.49 |
| Dec 16, 2024 | Amron Arthur Hdirector | Buy | 1,000 | $2.97 |
| Nov 26, 2024 | Booker Corey J.director | Sell | 10,000 | $3.43 |
| Nov 26, 2024 | Booker Corey J.director | Sell | 15,000 | $3.47 |
| Nov 22, 2024 | Booker Corey J.director | Sell | 6,709 | $3.25 |
| Nov 22, 2024 | Booker Corey J.director | Sell | 5,000 | $3.21 |
| Nov 15, 2024 | Booker Corey J.director | Sell | 7,100 | $3.68 |
| Nov 15, 2024 | Booker Corey J.director | Sell | 3,607 | $3.50 |
| Nov 12, 2024 | Booker Corey J.director | Sell | 24 | $3.76 |
| Nov 12, 2024 | Booker Corey J.director | Sell | 165 | $3.90 |
| Nov 12, 2024 | Booker Corey J.director | Sell | 3,494 | $3.61 |
| Jun 14, 2024 | SMITH ARTHUR Ldirector | Grant | 27,856 | — |
| Jun 14, 2024 | Jacobi Paul M.director | Grant | 27,856 | — |
| Jun 14, 2024 | Amron Arthur Hdirector | Grant | 27,856 | — |
| Jun 14, 2024 | Booker Corey J.director | Grant | 27,856 | — |
| Jun 14, 2024 | Palm James Ddirector | Grant | 27,856 | — |
| May 30, 2024 | Amron Arthur Hdirector | Buy | 2,000 | $3.57 |
| May 30, 2024 | Amron Arthur Hdirector | Buy | 3,000 | $3.65 |
| Mar 14, 2024 | Amron Arthur Hdirector | Buy | 3,000 | $3.72 |
| Dec 19, 2023 | Straehla Artydirector, officer: Chief Executive Officer | Sell | 40,000 | $4.35 |
| Dec 19, 2023 | Straehla Artydirector, officer: Chief Executive Officer | Sell | 30,000 | $4.38 |
| Dec 15, 2023 | Straehla Artydirector, officer: Chief Executive Officer | Sell | 25,000 | $4.39 |
Source: TUSK SEC Form 4 filings, latest Jun 22, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their TUSK positions over the last 6 months (SEC Form 13F).
Increased
47
New positions
42
Reduced
48
Sold out
26
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| WEXFORD CAPITAL LP | Unchanged | 22.1M | Feb 13, 2026 |
| WEXFORD CAPITAL LP | Reduced | 22.1M | May 15, 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Unchanged | 4.6M | Feb 17, 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Unchanged | 4.6M | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 1.6M | May 15, 2026 |
| BLACKROCK, INC. | Increased | 1.5M | Feb 12, 2026 |
| BLACKROCK, INC. | Reduced | 1.5M | May 13, 2026 |
| VANGUARD GROUP INC | Increased | 1.0M | Jan 29, 2026 |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 700K | Feb 12, 2026 |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 686K | May 7, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 611K | May 15, 2026 |
| PEAPOD LANE CAPITAL LLC | New Position | 600K | May 4, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 586K | Feb 9, 2026 |
| EMPOWERED FUNDS, LLC | Increased | 483K | Jun 16, 2026 |
| STATE STREET CORP | Increased | 422K | May 15, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.