Institutional Ownership
Mammoth Energy Svcs Inc
CUSIP 56155L108COMTUSKQ1 2026
13D / 13G Filings
13
Schedule 13D/13G on record
Beneficial Filers
5
Distinct reporting persons
Largest Stake
48.8%
Max % of class reported
Institutional Holders
85
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
13 filings · latest Aug 14, 2025
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Aug 14, 2025 | Valueworks Limited Partners, LP | 13G/A | 5.0% | — | SEC |
| 2 | Nov 13, 2024 | Valueworks LLC | 13G/A | 4.6% | 2.22M | SEC |
| 3 | Feb 13, 2024 | Valueworks LLC | 13G/A | 4.9% | 2.37M | SEC |
| 4 | Feb 9, 2024 | Wexford Capital LP | 13G/A | 47.1% | 22.57M | SEC |
| 5 | Feb 7, 2024 | Adage Capital Partners Gp, L.L.C. | 13G/A | 8.9% | 4.28M | SEC |
| 6 | Feb 10, 2023 | Valueworks LLC | 13G | 5.1% | 2.43M | SEC |
| 7 | Feb 9, 2023 | Adage Capital Partners Gp, L.L.C. | 13G/A | 6.6% | 3.13M | SEC |
| 8 | Feb 1, 2023 | Wexford Capital LP | 13G/A | 47.5% | 22.47M | SEC |
| 9 | Apr 21, 2022 | Adage Capital Partners Gp, L.L.C. | 13G | 6.1% | 2.85M | SEC |
| 10 | Feb 9, 2022 | Wexford Capital LP | 13G/A | 47.6% | 22.24M | SEC |
3 more beneficial-ownership filings on Premium
See the full Schedule 13D/13G history for Mammoth Energy Svcs Inc.
Unlock full historyTop Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Wexford Capital LP | 22.07M | $54.07M |
| 2 | Adage Capital Partners Gp, L.L.C. | 4.58M | $11.21M |
| 3 | Blackrock, Inc. | 1.45M | $3.56M |
| 4 | Dimensional Fund Advisors LP | 686.2K | $1.68M |
| 5 | Peapod Lane Capital LLC | 599.8K | $1.51M |
| 6 | Geode Capital Management, LLC | 610.9K | $1.50M |
| 7 | State Street Corp | 421.9K | $1.03M |
| 8 | Bridgeway Capital Management, LLC | 332.3K | $814.2K |
| 9 | Citadel Advisors LLC | 331.4K | $811.8K |
| 10 | Empowered Funds, LLC | 241.3K | $591.2K |