Mammoth Energy Services, Inc. 13F holders
93 funds reported a position in Mammoth Energy Services, Inc. in their 13F for the quarter ended 30 June 2026, together 26.1 million shares worth $84.7 million. Against the quarter before, 27 opened a position, 33 added, 23 trimmed and 23 sold out; together they sold a net 9.0 million shares. The largest holders: Wexford Capital LP, Adage Capital Partners GP, L.l.c. and Vanguard Capital Management LLC.
Funds holding93+3 on Q1 2026
Shares they held26.1Mworth $84.7 million
Net sold on the quarter9.0M sharesabout $29.2 million at the funds' values
Funds buying to selling60 to 46opened or added, to cut or sold
Opened 27Added 33Held 10Trimmed 23Sold out 23
What each fund did in TUSK against its 13F for the quarter before; a change under 0.1% of a holding counts as held
Funds reporting a position in TUSK in their 13F, each quarter; hover a bar for the shares they held
Filed so far for the quarter to 30 September 2026
3,405 funds have filed their 13F for the quarter so far; the rest are due by 16 November 2026. Of those, 7 reported a position in Mammoth Energy Services, Inc.: 0 opened one, 0 added, 6 trimmed and 6 sold out, a net 236,049 shares sold.
| Fund | Change in shares | Shares now | Status | Filing |
|---|---|---|---|---|
| Peapod Lane Capital LLC | -48,819 | 758,985 | trimmed | 13F |
| Steinberganna Wealth Management | -500 | 11,060 | trimmed | 13F |
| Essential Partners LLC | -195 | 17 | trimmed | 13F |
| Farther Finance Advisors, LLC | -106 | 1 | trimmed | 13F |
| SJS Investment Consulting Inc. | -28 | 2 | trimmed | 13F |
| IFP Advisors, Inc | -23 | 4 | trimmed | 13F |
| Caitong International Asset Management Co., Ltd | -10 | 0 | sold out | 13F |
| FNY Investment Advisers, LLC | -76,481 | 0 | sold out | 13F |
| Fortitude Family Office, LLC | -7 | 0 | sold out | 13F |
| Marquette Asset Management, LLC | -109,826 | 0 | sold out | 13F |
| True Wealth Design, LLC | -37 | 0 | sold out | 13F |
| Wealth Enhancement Trust Services, Inc. | -17 | 0 | sold out | 13F |
The largest moves in the name among the funds that have filed, against each fund's previous 13F.
The well-known funds
Of the 44 funds followed here, 7 reported a position in Mammoth Energy Services, Inc. in a 13F for the quarter ended 30 June 2026. The largest: Citadel Advisors, 452,163 shares worth $1.5 million, 0.0% of its reported book. New this quarter: Millennium Management, Point72 Asset Management, Two Sigma Investments. In the quarter, 6 funds added or opened a position and 1 trimmed or sold out; together they bought a net 131,410 shares, about $427,083 at the funds' own value per share on 30 June 2026. A change under 0.1% of a holding counts as held.
| Fund | Shares | Value | Of its book | Change on the quarter | Status | Quarter ended | Filing |
|---|---|---|---|---|---|---|---|
| Citadel Advisors | 452,163 | $1.5 million | 0.0% | +120,796 | added | 30 June 2026 | 13F |
| Geode Capital Management | 306,028 | $995,730 | 0.0% | -304,898 | trimmed | 30 June 2026 | 13F |
| Renaissance Technologies | 292,280 | $949,910 | 0.0% | +60,308 | added | 30 June 2026 | 13F |
| Millennium Management | 124,186 | $403,604 | 0.0% | +124,186 | new | 30 June 2026 | 13F |
| Point72 Asset Management | 72,091 | $234,296 | 0.0% | +72,091 | new | 30 June 2026 | 13F |
| Two Sigma Investments | 58,538 | $190,249 | 0.0% | +58,538 | new | 30 June 2026 | 13F |
| FMR LLC | 12,531 | $40,726 | 0.0% | +389 | added | 30 June 2026 | 13F |
Value is what the fund reported.
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Change is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.The largest holders
| Fund | Shares | Share of all | Value | Of its book | Change in shares | Filing |
|---|---|---|---|---|---|---|
| Wexford Capital LP | 12,071,823 | 46.29% | $39.2 million | 5.38% | -9,996,389 | 13F |
| Adage Capital Partners GP, L.l.c. | 4,575,000 | 17.54% | $14.9 million | 0.02% | no change | 13F |
| Vanguard Capital Management LLC | 1,059,603 | 4.06% | $3.4 million | 0.00% | +240,483 | 13F |
| Peapod Lane Capital LLC | 807,804 | 3.10% | $2.6 million | 1.77% | +207,999 | 13F |
| Dimensional Fund Advisors LP | 691,667 | 2.65% | $2.2 million | 0.00% | +5,468 | 13F |
| Jane Street Group, LLC | 506,662 | 1.94% | $1.6 million | 0.00% | +483,808 | 13F |
| Citadel Advisors LLC | 452,163 | 1.73% | $1.5 million | 0.00% | +120,796 | 13F |
| BlackRock, Inc. | 407,976 | 1.56% | $1.3 million | 0.00% | -1,046,863 | 13F |
| Marshall Wace, LLP | 395,583 | 1.52% | $1.3 million | 0.00% | new | 13F |
| Johns Hopkins University | 387,359 | 1.49% | $1.3 million | 0.08% | new | 13F |
| Bridgeway Capital Management, LLC | 332,313 | 1.27% | $1.1 million | 0.02% | no change | 13F |
| Russell Investments Group, Ltd. | 329,821 | 1.26% | $1.1 million | 0.00% | +261,791 | 13F |
| Geode Capital Management, LLC | 306,028 | 1.17% | $995,730 | 0.00% | -304,898 | 13F |
| Renaissance Technologies LLC | 292,280 | 1.12% | $949,910 | 0.00% | +60,308 | 13F |
| Arrowstreet Capital, Limited Partnership | 290,096 | 1.11% | $942,812 | 0.00% | new | 13F |
| Empowered Funds, LLC | 241,313 | 0.93% | $784,267 | 0.00% | no change | 13F |
| AQR Capital Management LLC | 177,824 | 0.68% | $577,928 | 0.00% | +111,093 | 13F |
| Vanguard Fiduciary Trust Co. | 161,791 | 0.62% | $525,821 | 0.00% | -8,340 | 13F |
| Round Rock Advisors LLC | 152,841 | 0.59% | $496,733 | 0.06% | new | 13F |
| Morgan Stanley | 133,560 | 0.51% | $434,070 | 0.00% | -19,163 | 13F |
| Centiva Capital, LP | 130,870 | 0.50% | $425,328 | 0.01% | +19,762 | 13F |
| Gsa Capital Partners LLP | 129,547 | 0.50% | $421,000 | 0.03% | +115,638 | 13F |
| Millennium Management LLC | 124,186 | 0.48% | $403,604 | 0.00% | new | 13F |
| Acadian Asset Management LLC | 122,050 | 0.47% | $396,000 | 0.00% | -82,055 | 13F |
| Marquette Asset Management, LLC | 109,826 | 0.42% | $356,935 | 0.05% | new | 13F |
| Stifel Financial Corp. | 105,572 | 0.40% | $343,109 | 0.00% | no change | 13F |
| State Street Corp. | 101,864 | 0.39% | $331,058 | 0.00% | -320,058 | 13F |
| Bank of America Corp. | 97,046 | 0.37% | $315,400 | 0.00% | +71,457 | 13F |
| BNP Paribas Financial Markets | 92,964 | 0.36% | $302,133 | 0.00% | +76,217 | 13F |
| FNY Investment Advisers, LLC | 76,481 | 0.29% | $248,000 | 0.09% | new | 13F |
| Point72 Asset Management, L.P. | 72,091 | 0.28% | $234,296 | 0.00% | new | 13F |
| Boston Partners | 68,935 | 0.26% | $224,040 | 0.00% | -85,453 | 13F |
| Aster Capital Management (DIFC) Ltd | 67,570 | 0.26% | $219,603 | 0.05% | new | 13F |
| Bank of New York Mellon Corp | 62,007 | 0.24% | $201,523 | 0.00% | -70,532 | 13F |
| Qube Research & Technologies Ltd | 58,859 | 0.23% | $191,292 | 0.00% | new | 13F |
| Two Sigma Investments, LP | 58,538 | 0.22% | $190,249 | 0.00% | new | 13F |
| Northern Trust Corp. | 57,180 | 0.22% | $185,835 | 0.00% | -129,948 | 13F |
| Goldman Sachs Group Inc. | 54,928 | 0.21% | $178,516 | 0.00% | -168,561 | 13F |
| Susquehanna International Group, LLP | 49,920 | 0.19% | $162,240 | 0.00% | +13,621 | 13F |
| XTX Topco Ltd | 49,261 | 0.19% | $160,098 | 0.00% | new | 13F |
| Walleye Capital LLC | 49,141 | 0.19% | $159,708 | 0.00% | new | 13F |
| Wellington Management Group LLP | 47,486 | 0.18% | $154,330 | 0.00% | -20,929 | 13F |
| Algert Global LLC | 45,997 | 0.18% | $149,490 | 0.00% | new | 13F |
| Quadrature Capital Ltd | 44,015 | 0.17% | $143,049 | 0.00% | new | 13F |
| HSBC Holdings PLC | 33,706 | 0.13% | $108,028 | 0.00% | new | 13F |
| HRT Financial LP | 30,632 | 0.12% | $99,000 | 0.00% | new | 13F |
| UBS Group AG | 29,518 | 0.11% | $95,933 | 0.00% | +21,851 | 13F |
| Connor, Clark & Lunn Investment Management Ltd. | 28,581 | 0.11% | $92,888 | 0.00% | +14,071 | 13F |
| Captrust Financial Advisors | 26,799 | 0.10% | $87,097 | 0.00% | new | 13F |
| Barclays PLC | 25,553 | 0.10% | $83,048 | 0.00% | +19,972 | 13F |
The 50 largest of the 93 funds that reported a position in TUSK in their 13F for the quarter ended 30 June 2026, by the value each reported.
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Share of all is the fund's part of all the shares the funds reported. Change is shares against the fund's 13F for the quarter before. A 13F lists a manager's long positions in US-listed shares at the quarter's end. What is a 13F?Options the funds reported on TUSK
| Fund | Option | Shares under the options | Value of those shares | Quarter ended | Filing |
|---|---|---|---|---|---|
| Citadel Advisors | Calls | 141,100 | $458,575 | 30 June 2026 | 13F |
A 13F lists calls and puts by the shares they cover and what those shares were worth at the quarter's end, not what the options cost.
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They are not counted in the holdings above. A put gains when the stock falls, a call when it rises, and a fund may hold either to hedge.Schedule 13D and 13G filed on the name, last twelve months
| Filed | Schedule | Who | Holding | Of the class | Event date | Rule or purpose | Filing |
|---|---|---|---|---|---|---|---|
| 22 June 2026 | 13G | Charles E. Davidson and 3 others | 6.5 million | 13.4% | 17 June 2026 | passive, under 20% (13d-1(c)) | EDGAR |
| 22 June 2026 | 13G/A | Wexford Capital LP and 7 others | 12.1 million | 25.1% | 17 June 2026 | passive, other (13d-1(d)) | EDGAR |
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
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Amendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short. 13D and 13GFails to deliver
| Settlement date | Shares failed | Price | File |
|---|---|---|---|
| 21 August 2026 | 2,569 | $3.23 | SEC |
| 17 August 2026 | 963 | $3.32 | SEC |
| 6 August 2026 | 15,115 | $2.85 | SEC |
| 29 July 2026 | 7,748 | $2.60 | SEC |
| 17 July 2026 | 13 | $2.85 | SEC |
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.