MAMMOTH ENERGY SERVICES, INC. - TUSK
Detailed investor-level table based on 13F positions.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| WEXFORD CAPITAL LP | History | Reduced | 22,068,212 | 54,067 | 7.83% | 7.88% | 1 | -27,856 | -0.13% | Q1 2026 | May 15, 2026 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | History | No change | 4,575,000 | 11,208 | 0.02% | 0.01% | 2 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| BlackRock, Inc. | History | Reduced | 1,454,839 | 3,564 | 0.0% | 0.0% | 3 | -18,205 | -1.24% | Q1 2026 | May 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | History | New | 819,120 | 2,006 | 0.0% | — | 4 | +819,120 | New | Q1 2026 | May 15, 2026 |
| VANGUARD GROUP INC | History | No change | 1,022,411 | 1,891 | 0.0% | 0.0% | 5 | 0 | 0.0% | Q4 2025 | Jan 29, 2026 |
| DIMENSIONAL FUND ADVISORS LP | History | Reduced | 686,199 | 1,681 | 0.0% | 0.0% | 6 | -13,479 | -1.93% | Q1 2026 | May 07, 2026 |
| Peapod Lane Capital LLC | History | New | 599,805 | 1,513 | 1.24% | — | 7 | +599,805 | New | Q1 2026 | May 01, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Added to | 610,926 | 1,496 | 0.0% | 0.0% | 8 | +25,207 | 4.3% | Q1 2026 | May 15, 2026 |
| STATE STREET CORP | History | Added to | 421,922 | 1,033 | 0.0% | 0.0% | 9 | +13,438 | 3.29% | Q1 2026 | May 15, 2026 |
| CITADEL ADVISORS LLC | History | Added to | 341,967 | 837 | 0.0% | 0.0% | 10 | +121,856 | 55.36% | Q1 2026 | May 15, 2026 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | History | Reduced | 332,313 | 814 | 0.02% | 0.02% | 11 | -77,678 | -18.95% | Q1 2026 | May 15, 2026 |
| Empowered Funds, LLC | History | Added to | 241,313 | 591 | 0.0% | 0.01% | 12 | +22,322 | 10.19% | Q1 2026 | May 14, 2026 |
| RENAISSANCE TECHNOLOGIES LLC | History | Added to | 231,972 | 568 | 0.0% | 0.0% | 13 | +45,900 | 24.67% | Q1 2026 | May 14, 2026 |
| GOLDMAN SACHS GROUP INC | History | Added to | 223,489 | 547 | 0.0% | 0.0% | 14 | +133,545 | 148.48% | Q1 2026 | May 15, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | History | Added to | 204,105 | 498 | 0.0% | 0.0% | 15 | +97,213 | 90.95% | Q1 2026 | May 13, 2026 |
| NORTHERN TRUST CORP | History | Added to | 187,128 | 458 | 0.0% | 0.0% | 16 | +19,283 | 11.49% | Q1 2026 | May 14, 2026 |
| VANGUARD FIDUCIARY TRUST CO | History | New | 170,131 | 416 | 0.0% | — | 17 | +170,131 | New | Q1 2026 | May 08, 2026 |
| LOS ANGELES CAPITAL MANAGEMENT LLC | History | New | 163,259 | 399 | 0.0% | — | 18 | +163,259 | New | Q1 2026 | May 08, 2026 |
| Boston Partners | History | New | 154,388 | 378 | 0.0% | — | 19 | +154,388 | New | Q1 2026 | May 11, 2026 |
| MORGAN STANLEY | History | Reduced | 152,723 | 374 | 0.0% | 0.0% | 20 | -139,975 | -47.82% | Q1 2026 | May 15, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | History | New | 140,145 | 343 | 0.0% | — | 21 | +140,145 | New | Q1 2026 | May 08, 2026 |
| Bank of New York Mellon Corp | History | Reduced | 132,539 | 324 | 0.0% | 0.0% | 22 | -135 | -0.1% | Q1 2026 | May 05, 2026 |
| Centiva Capital, LP | History | Added to | 111,108 | 272 | 0.0% | 0.0% | 23 | +69,791 | 168.92% | Q1 2026 | May 14, 2026 |
| STIFEL FINANCIAL CORP | History | No change | 105,572 | 258 | 0.0% | 0.0% | 24 | 0 | 0.0% | Q1 2026 | May 12, 2026 |
| OSAIC HOLDINGS, INC. | History | Reduced | 72,419 | 177 | 0.0% | 0.0% | 25 | -7,267 | -9.12% | Q1 2026 | May 15, 2026 |
| WELLINGTON MANAGEMENT GROUP LLP | History | Added to | 68,415 | 167 | 0.0% | 0.0% | 26 | +12,017 | 21.31% | Q1 2026 | May 15, 2026 |
| Russell Investments Group, Ltd. | History | Reduced | 68,030 | 166 | 0.0% | 0.0% | 27 | -179,461 | -72.51% | Q1 2026 | May 08, 2026 |
| AQR CAPITAL MANAGEMENT LLC | History | Added to | 66,731 | 163 | 0.0% | 0.0% | 28 | +55,476 | 492.9% | Q1 2026 | May 15, 2026 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | History | Reduced | 58,861 | 144 | 0.0% | 0.0% | 29 | -11,813 | -16.71% | Q1 2026 | May 15, 2026 |
| Squarepoint Ops LLC | History | Reduced | 51,620 | 126 | 0.0% | 0.0% | 30 | -24,544 | -32.23% | Q1 2026 | May 15, 2026 |
| Nuveen, LLC | History | No change | 36,843 | 90 | 0.0% | 0.0% | 31 | 0 | 0.0% | Q1 2026 | Apr 30, 2026 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | History | Added to | 36,299 | 88 | 0.0% | 0.0% | 32 | +26,035 | 253.65% | Q1 2026 | May 15, 2026 |
| JANE STREET GROUP, LLC | History | Reduced | 34,754 | 85 | 0.0% | 0.0% | 33 | -4,898 | -12.35% | Q1 2026 | May 12, 2026 |
| OCCUDO QUANTITATIVE STRATEGIES LP | History | New | 29,336 | 83 | 0.0% | — | 34 | +29,336 | New | Q1 2026 | May 15, 2026 |
| RHUMBLINE ADVISERS | History | Added to | 32,863 | 80 | 0.0% | 0.0% | 35 | +220 | 0.67% | Q1 2026 | May 12, 2026 |
| Mariner, LLC | History | New | 26,873 | 65 | 0.0% | — | 36 | +26,873 | New | Q1 2026 | May 13, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Added to | 25,589 | 62 | 0.0% | 0.0% | 37 | +3,517 | 15.93% | Q1 2026 | May 15, 2026 |
| LEVIN CAPITAL STRATEGIES, L.P. | History | New | 25,000 | 61 | 0.0% | — | 38 | +25,000 | New | Q1 2026 | May 13, 2026 |
| Verdad Advisers, LP | History | New | 22,729 | 55 | 0.06% | — | 39 | +22,729 | New | Q1 2026 | May 15, 2026 |
| Schonfeld Strategic Advisors LLC | History | New | 18,325 | 44 | 0.0% | — | 41 | +18,325 | New | Q1 2026 | May 15, 2026 |
| STEINBERGANNA WEALTH MANAGEMENT | History | Added to | 18,360 | 44 | 0.02% | 0.01% | 40 | +4,745 | 34.85% | Q1 2026 | Apr 15, 2026 |
| Creative Planning | History | Added to | 16,950 | 41 | 0.0% | 0.0% | 43 | +4,844 | 40.01% | Q1 2026 | May 12, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | Reduced | 16,747 | 41 | 0.0% | 0.0% | 42 | -267 | -1.57% | Q1 2026 | May 12, 2026 |
| Sanctuary Advisors, LLC | History | New | 16,676 | 40 | 0.0% | — | 44 | +16,676 | New | Q1 2026 | May 05, 2026 |
| Connor, Clark & Lunn Investment Management Ltd. | History | New | 14,510 | 35 | 0.0% | — | 45 | +14,510 | New | Q1 2026 | May 11, 2026 |
| GSA CAPITAL PARTNERS LLP | History | New | 13,909 | 34 | 0.0% | — | 46 | +13,909 | New | Q1 2026 | May 08, 2026 |
| SEI INVESTMENTS CO | History | New | 13,579 | 33 | 0.0% | — | 48 | +13,579 | New | Q1 2026 | May 13, 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ | History | No change | 13,385 | 33 | 0.0% | 0.0% | 47 | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| Tower Research Capital LLC (TRC) | History | Added to | 12,522 | 30 | 0.0% | 0.0% | 49 | +6,971 | 125.58% | Q1 2026 | May 15, 2026 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | History | Added to | 12,570 | 30 | 0.0% | 0.0% | 50 | +272 | 2.21% | Q1 2026 | May 15, 2026 |
| FMR LLC | History | Added to | 12,142 | 29 | 0.0% | 0.0% | 51 | +1,036 | 9.33% | Q1 2026 | May 15, 2026 |
| Archer Investment Corp | History | No change | 11,200 | 27 | 0.01% | 0.0% | 52 | 0 | 0.0% | Q1 2026 | May 04, 2026 |
| JPMORGAN CHASE & CO | History | Reduced | 10,275 | 26 | 0.0% | 0.0% | 53 | -155,709 | -93.81% | Q1 2026 | May 13, 2026 |
| VALUEWORKS LLC | History | Reduced | 10,720 | 26 | 0.01% | 0.01% | 55 | -2,055 | -16.09% | Q1 2026 | May 15, 2026 |
| NEW YORK STATE COMMON RETIREMENT FUND | History | No change | 10,696 | 26 | 0.0% | 0.0% | 54 | 0 | 0.0% | Q1 2026 | May 06, 2026 |
| WELLS FARGO & COMPANY/MN | History | Reduced | 9,469 | 23 | 0.0% | 0.0% | 56 | -18,032 | -65.57% | Q1 2026 | May 11, 2026 |
| Police & Firemen's Retirement System of New Jersey | History | No change | 9,637 | 23 | 0.0% | 0.0% | 57 | 0 | 0.0% | Q1 2026 | Apr 29, 2026 |
| Vanguard Global Advisers, LLC | History | New | 8,774 | 21 | 0.0% | — | 58 | +8,774 | New | Q1 2026 | May 08, 2026 |
| ALLIANCEBERNSTEIN L.P. | History | Reduced | 10,950 | 20 | 0.0% | 0.0% | 59 | -440 | -3.86% | Q1 2026 | May 15, 2026 |
| UBS Group AG | History | Reduced | 7,667 | 18 | 0.0% | 0.0% | 60 | -9,947 | -56.47% | Q1 2026 | May 05, 2026 |
| CWM, LLC | History | Added to | 5,793 | 14 | 0.0% | — | 62 | +5,528 | 2086.04% | Q1 2026 | May 14, 2026 |
| PNC FINANCIAL SERVICES GROUP, INC. | History | Added to | 5,720 | 14 | 0.0% | 0.0% | 61 | +2,098 | 57.92% | Q1 2026 | May 08, 2026 |
| BARCLAYS PLC | History | Reduced | 5,581 | 13 | 0.0% | 0.0% | 63 | -32,483 | -85.34% | Q1 2026 | May 14, 2026 |
| SIMPLEX TRADING, LLC | History | New | 5,538 | 13 | 0.0% | — | 64 | +5,538 | New | Q1 2026 | May 14, 2026 |
| Legal & General Group Plc | History | No change | 2,179 | 5 | 0.0% | 0.0% | 65 | 0 | 0.0% | Q1 2026 | May 08, 2026 |
| Ameritas Investment Partners, Inc. | History | No change | 1,924 | 4 | 0.0% | 0.0% | 66 | 0 | 0.0% | Q1 2026 | May 13, 2026 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | History | New | 1,416 | 3 | 0.0% | — | 67 | +1,416 | New | Q1 2026 | May 13, 2026 |
| CITIGROUP INC | History | Added to | 1,127 | 2 | 0.0% | 0.0% | 68 | +578 | 105.28% | Q1 2026 | May 11, 2026 |
| Sterling Capital Management LLC | History | Reduced | 803 | 1 | 0.0% | 0.0% | 69 | -871 | -52.03% | Q1 2026 | Apr 22, 2026 |
| ALLIANZ SE | History | New | 800 | 1 | 0.0% | — | 70 | +800 | New | Q1 2026 | May 11, 2026 |
| Advisory Services Network, LLC | History | New | 500 | 1 | 0.0% | — | 71 | +500 | New | Q1 2026 | May 15, 2026 |
| Corient Private Wealth LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -97,902 | -100.0% | Q1 2026 | May 15, 2026 |
| LANDSCAPE CAPITAL MANAGEMENT, L.L.C. | History | Closed out | 0 | 0 | — | 0.01% | — | -72,619 | -100.0% | Q1 2026 | May 12, 2026 |
| FRANKLIN RESOURCES INC | History | Closed out | 0 | 0 | — | 0.0% | — | -72,088 | -100.0% | Q1 2026 | May 13, 2026 |
| Quadrature Capital Ltd | History | Closed out | 0 | 0 | — | 0.0% | — | -65,875 | -100.0% | Q1 2026 | May 15, 2026 |
| XTX Topco Ltd | History | Closed out | 0 | 0 | — | 0.0% | — | -45,235 | -100.0% | Q1 2026 | May 15, 2026 |
| MARSHALL WACE, LLP | History | Closed out | 0 | 0 | — | 0.0% | — | -30,801 | -100.0% | Q1 2026 | May 14, 2026 |
| NewEdge Advisors, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -20,498 | -100.0% | Q1 2026 | May 15, 2026 |
| Virtu Financial LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -17,973 | -100.0% | Q1 2026 | May 14, 2026 |
| Point72 Asset Management, L.P. | History | Closed out | 0 | 0 | — | 0.0% | — | -14,925 | -100.0% | Q1 2026 | May 15, 2026 |
| Invesco Ltd. | History | Closed out | 0 | 0 | — | 0.0% | — | -10,710 | -100.0% | Q1 2026 | May 12, 2026 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | History | Closed out | 0 | 0 | — | 0.0% | — | -1,487 | -100.0% | Q1 2026 | May 15, 2026 |
| ROYAL BANK OF CANADA | History | Reduced | 1 | 0 | — | 0.0% | — | -1,099 | -99.91% | Q1 2026 | May 15, 2026 |
| AMALGAMATED BANK | History | Closed out | 0 | 0 | — | 0.0% | — | -762 | -100.0% | Q1 2026 | May 08, 2026 |
| Allworth Financial LP | History | New | 202 | 0 | — | — | — | +202 | New | Q1 2026 | May 14, 2026 |
| MAI Capital Management | History | New | 168 | 0 | — | — | — | +168 | New | Q1 2026 | May 15, 2026 |
| ROTHSCHILD INVESTMENT LLC | History | New | 133 | 0 | — | — | — | +133 | New | Q1 2026 | May 07, 2026 |
| Optiver Holding B.V. | History | Reduced | 200 | 0 | — | — | — | -128 | -39.02% | Q1 2026 | May 15, 2026 |
| EverSource Wealth Advisors, LLC | History | Added to | 84 | 0 | — | — | — | +76 | 950.0% | Q1 2026 | May 15, 2026 |
| Root Financial Partners, LLC | History | New | 32 | 0 | — | — | — | +32 | New | Q1 2026 | Apr 24, 2026 |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | History | Closed out | 0 | 0 | — | — | — | -28 | -100.0% | Q1 2026 | May 07, 2026 |
| IFP Advisors, Inc | History | Reduced | 5 | 0 | — | — | — | -26 | -83.87% | Q1 2026 | Apr 13, 2026 |
| True Wealth Design, LLC | History | Added to | 25 | 0 | — | — | — | +21 | 525.0% | Q1 2026 | Apr 13, 2026 |
| Essential Partners LLC | History | New | 20 | 0 | — | — | — | +20 | New | Q1 2026 | May 21, 2026 |
| SBI Securities Co., Ltd. | History | Reduced | 101 | 0 | — | — | — | -19 | -15.83% | Q1 2026 | Apr 27, 2026 |
| Arax Advisory Partners | History | New | 17 | 0 | — | — | — | +17 | New | Q1 2026 | May 13, 2026 |
| SJS Investment Consulting Inc. | History | New | 17 | 0 | — | — | — | +17 | New | Q1 2026 | Apr 23, 2026 |
| Wealth Preservation Advisors, LLC | History | New | 15 | 0 | — | — | — | +15 | New | Q1 2026 | May 15, 2026 |
| Farther Finance Advisors, LLC | History | New | 14 | 0 | — | — | — | +14 | New | Q1 2026 | Apr 07, 2026 |
| JPL Wealth Management, LLC | History | New | 9 | 0 | — | — | — | +9 | New | Q1 2026 | May 08, 2026 |
| Caitong International Asset Management Co., Ltd | History | New | 2 | 0 | — | — | — | +2 | New | Q1 2026 | May 11, 2026 |
| Transamerica Financial Advisors, LLC | History | No change | 31 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 15, 2026 |
| Westside Investment Management, Inc. | History | No change | 187 | 0 | — | — | — | 0 | 0.0% | Q1 2026 | May 04, 2026 |