OKLAHOMA CITY, OK
MAMMOTH ENERGY SERVICES, INC.TUSK— Latest position per institution from SEC 13F filings
15
Institutional holders
27.39M
Total shares held
87.15M
Estimated value
1.37M
Avg. position size
WEXFORD CAPITAL LP
CIK 1048462
Shares
12.07M
Value
39.23M
Filed
Jun 30, 2026
ADAGE CAPITAL PARTNERS GP, L.L.C.
CIK 1165408
Shares
4.58M
Value
14.87M
Filed
Jun 30, 2026
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
1.41M
Value
4.63M
Filed
Jun 30, 2024
KANEN WEALTH MANAGEMENT LLC
CIK 1681614
Shares
1.32M
Value
4.34M
Filed
Jun 30, 2024
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
1.06M
Value
3.44M
Filed
Jun 30, 2026
VANGUARD GROUP INC
CIK 102909
Shares
1.02M
Value
1.89M
Filed
Dec 31, 2025
PEAPOD LANE CAPITAL LLC
CIK 2050979
Shares
758.99K
Value
2.16M
Filed
Sep 30, 2026
DIMENSIONAL FUND ADVISORS LP
CIK 354204
Shares
691.67K
Value
2.25M
Filed
Jun 30, 2026
CITADEL ADVISORS LLC
CIK 1423053
Shares
593.26K
Value
1.93M
Filed
Jun 30, 2026
EXENCIAL WEALTH ADVISORS, LLC
CIK 1576151
Shares
507.61K
Value
2.14M
Filed
Mar 31, 2023
JANE STREET GROUP, LLC
CIK 1595888
Shares
506.66K
Value
1.65M
Filed
Jun 30, 2026
BLACKROCK, INC.
CIK 2012383
Shares
407.98K
Value
1.33M
Filed
Jun 30, 2026
MARSHALL WACE, LLP
CIK 1318757
Shares
395.58K
Value
1.29M
Filed
Jun 30, 2026
JOHNS HOPKINS UNIVERSITY
CIK 1764756
Shares
387.36K
Value
1.26M
Filed
Jun 30, 2026
BRIDGEWAY CAPITAL MANAGEMENT, LLC
CIK 1107261
Shares
332.31K
Value
1.08M
Filed
Jun 30, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
306.03K
Value
995.73K
Filed
Jun 30, 2026
RENAISSANCE TECHNOLOGIES LLC
CIK 1037389
Shares
292.28K
Value
949.91K
Filed
Jun 30, 2026
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
CIK 1164508
Shares
290.10K
Value
942.81K
Filed
Jun 30, 2026
EMPOWERED FUNDS, LLC
CIK 1592828
Shares
241.31K
Value
784.27K
Filed
Jun 30, 2026
X-SQUARE CAPITAL, LLC
CIK 1729300
Shares
215.09K
Value
706.00
Filed
Jun 30, 2024
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | WEXFORD CAPITAL LP | 1048462 | 12.07M | 39.23M | Jun 30, 2026 |
| 2 | ADAGE CAPITAL PARTNERS GP, L.L.C. | 1165408 | 4.58M | 14.87M | Jun 30, 2026 |
| 3 | BLACKROCK FINANCE, INC. | 1364742 | 1.41M | 4.63M | Jun 30, 2024 |
| 4 | KANEN WEALTH MANAGEMENT LLC | 1681614 | 1.32M | 4.34M | Jun 30, 2024 |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 1.06M | 3.44M | Jun 30, 2026 |
| 6 | VANGUARD GROUP INC | 102909 | 1.02M | 1.89M | Dec 31, 2025 |
| 7 | PEAPOD LANE CAPITAL LLC | 2050979 | 758.99K | 2.16M | Sep 30, 2026 |
| 8 | DIMENSIONAL FUND ADVISORS LP | 354204 | 691.67K | 2.25M | Jun 30, 2026 |
| 9 | CITADEL ADVISORS LLC | 1423053 | 593.26K | 1.93M | Jun 30, 2026 |
| 10 | EXENCIAL WEALTH ADVISORS, LLC | 1576151 | 507.61K | 2.14M | Mar 31, 2023 |
| 11 | JANE STREET GROUP, LLC | 1595888 | 506.66K | 1.65M | Jun 30, 2026 |
| 12 | BLACKROCK, INC. | 2012383 | 407.98K | 1.33M | Jun 30, 2026 |
| 13 | MARSHALL WACE, LLP | 1318757 | 395.58K | 1.29M | Jun 30, 2026 |
| 14 | JOHNS HOPKINS UNIVERSITY | 1764756 | 387.36K | 1.26M | Jun 30, 2026 |
| 15 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 1107261 | 332.31K | 1.08M | Jun 30, 2026 |
| 16 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 306.03K | 995.73K | Jun 30, 2026 |
| 17 | RENAISSANCE TECHNOLOGIES LLC | 1037389 | 292.28K | 949.91K | Jun 30, 2026 |
| 18 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1164508 | 290.10K | 942.81K | Jun 30, 2026 |
| 19 | EMPOWERED FUNDS, LLC | 1592828 | 241.31K | 784.27K | Jun 30, 2026 |
| 20 | X-SQUARE CAPITAL, LLC | 1729300 | 215.09K | 706.00 | Jun 30, 2024 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.