Mammoth Energy Services (TUSK)
Rents oilfield equipment and supplies sand proppant, contract drilling, and workforce housing to US producers.
$3.24
At close+0.14 (+4.52%)
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Breakdown13F · 13D/G · Form 4
| Institutions91 holders · as of Mar 31, 2026 | 72.86% | 35.06M shares | |
| Insiders6 holders · as of Jul 1, 2026 | 14.57% | 7.01M shares | |
| Strategic holders2 holders · as of Jul 12, 2021 | 25.68% | 12.36M shares | |
| Adds to | 113.11% |
48.13M company shares as of Sep 3, 2026 · institutions as of Mar 31, 2026 · holders as of their latest filing
These groups come from separate filings that can overlap, so they add to 113.11%; nothing is left for Other.
Institutions13F, as of Mar 31, 2026
91 holders · 35.06M shares · 33 new positions · 56 increased · 22 reduced · 15 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Wexford Capital LP | 22.07M | 45.85% | −27.9K | May 15, 2026 |
| Adage Capital Partners GP, L.L.C. | 4.58M | 9.51% | 0 | May 15, 2026 |
| BlackRock, Inc. | 1.45M | 3.02% | −18.2K | May 13, 2026 |
| Vanguard Capital Management LLC | 819.1K | 1.70% | +819.1Knew | May 15, 2026 |
| Dimensional Fund Advisors LP | 686.2K | 1.43% | −13.5K | May 7, 2026 |
| Geode Capital Management, LLC | 610.9K | 1.27% | +25.2K | May 15, 2026 |
| Peapod Lane Capital LLC | 599.8K | 1.25% | +599.8Knew | May 4, 2026 |
| State Street Corp | 421.9K | 0.88% | +13.4K | May 15, 2026 |
Ownership statements13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Wexford Capital LP | 25.06% | 12.07M | 13G | Jun 22, 2026 ↗ |
| Charles E. Davidson | 13.43% | 6.47M | 13G | Jun 22, 2026 ↗ |
Insider tradesForm 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Jun 17, 2026 | Wexford Capital LPdirector, 10 percent owner, officer: Chief Business Officer | Purchase | 4,019,574 | $2.60 | 10,620,789 |
| Jun 11, 2026 | Arthur H. Amrondirector | Purchase | 2,500 | $3.22 | 65,135 |
| Jun 12, 2026 | Arthur H. Amrondirector | Purchase | 2,000 | $3.28 | 67,135 |
| May 26, 2026 | Arthur H. Amrondirector | Purchase | 2,500 | $3.24 | 59,635 |
| May 28, 2026 | Arthur H. Amrondirector | Purchase | 3,000 | $3.25 | 62,635 |
| Dec 11, 2025 | Arthur H. Amrondirector | Purchase | 10,000 | $1.89 | 57,135 |
CongressHouse and Senate disclosures
Not reported.