TUSK Mammoth Energy Services, Inc.
Mammoth Energy Services, Inc. (TUSK) Institutional Ownership
What the institutions did with TUSK last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| WEXFORD CAPITAL LP | 12.1M | 46.3% |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 4.6M | 17.5% |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.1M | 4.1% |
| Peapod Lane Capital LLC | 807.8K | 3.1% |
| DIMENSIONAL FUND ADVISORS LP | 691.7K | 2.7% |
| JANE STREET GROUP, LLC | 506.7K | 1.9% |
| CITADEL ADVISORS LLC | 452.2K | 1.7% |
| BlackRock, Inc. | 408.0K | 1.6% |
| MARSHALL WACE, LLP | 395.6K | 1.5% |
| Johns Hopkins University | 387.4K | 1.5% |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 332.3K | 1.3% |
| Russell Investments Group, Ltd. | 329.8K | 1.3% |
| GEODE CAPITAL MANAGEMENT, LLC | 306.0K | 1.2% |
| RENAISSANCE TECHNOLOGIES LLC | 292.3K | 1.1% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 290.1K | 1.1% |
| Empowered Funds, LLC | 241.3K | 0.9% |
| AQR CAPITAL MANAGEMENT LLC | 177.8K | 0.7% |
| VANGUARD FIDUCIARY TRUST CO | 161.8K | 0.6% |
| Round Rock Advisors LLC | 152.8K | 0.6% |
| MORGAN STANLEY | 133.6K | 0.5% |
| Centiva Capital, LP | 130.9K | 0.5% |
| GSA CAPITAL PARTNERS LLP | 129.5K | 0.5% |
| MILLENNIUM MANAGEMENT LLC | 124.2K | 0.5% |
| ACADIAN ASSET MANAGEMENT LLC | 122.1K | 0.5% |
| Marquette Asset Management, LLC | 109.8K | 0.4% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| WEXFORD CAPITAL LP | Reduced | 22.1M | 12.1M | -10.0M |
| BlackRock, Inc. | Reduced | 1.5M | 408.0K | -1.0M |
| JANE STREET GROUP, LLC | Increased | 22.9K | 506.7K | +483.8K |
| MARSHALL WACE, LLP | New | 0 | 395.6K | +395.6K |
| Johns Hopkins University | New | 0 | 387.4K | +387.4K |
| STATE STREET CORP | Reduced | 421.9K | 101.9K | -320.1K |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | 610.9K | 306.0K | -304.9K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | New | 0 | 290.1K | +290.1K |
| Russell Investments Group, Ltd. | Increased | 68.0K | 329.8K | +261.8K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 819.1K | 1.1M | +240.5K |
| Peapod Lane Capital LLC | Increased | 599.8K | 807.8K | +208.0K |
| GOLDMAN SACHS GROUP INC | Reduced | 223.5K | 54.9K | -168.6K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | Sold Out | 163.3K | 0 | -163.3K |
| Round Rock Advisors LLC | New | 0 | 152.8K | +152.8K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Sold Out | 140.1K | 0 | -140.1K |
| NORTHERN TRUST CORP | Reduced | 187.1K | 57.2K | -129.9K |
| MILLENNIUM MANAGEMENT LLC | New | 0 | 124.2K | +124.2K |
| CITADEL ADVISORS LLC | Increased | 331.4K | 452.2K | +120.8K |
| GSA CAPITAL PARTNERS LLP | Increased | 13.9K | 129.5K | +115.6K |
| AQR CAPITAL MANAGEMENT LLC | Increased | 66.7K | 177.8K | +111.1K |
| Marquette Asset Management, LLC | New | 0 | 109.8K | +109.8K |
| Boston Partners | Reduced | 154.4K | 68.9K | -85.5K |
| ACADIAN ASSET MANAGEMENT LLC | Reduced | 204.1K | 122.1K | -82.1K |
| FNY Investment Advisers, LLC | New | 0 | 76.5K | +76.5K |
| BNP PARIBAS FINANCIAL MARKETS | Increased | 16.7K | 93.0K | +76.2K |
| OSAIC HOLDINGS, INC. | Reduced | 72.4K | 150 | -72.3K |
| Point72 Asset Management, L.P. | New | 0 | 72.1K | +72.1K |
| BANK OF AMERICA CORP /DE/ | Increased | 25.6K | 97.0K | +71.5K |
| Bank of New York Mellon Corp | Reduced | 132.5K | 62.0K | -70.5K |
| Aster Capital Management (DIFC) Ltd | New | 0 | 67.6K | +67.6K |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 232.0K | 292.3K | +60.3K |
| Qube Research & Technologies Ltd | New | 0 | 58.9K | +58.9K |
| TWO SIGMA INVESTMENTS, LP | New | 0 | 58.5K | +58.5K |
| Squarepoint Ops LLC | Sold Out | 51.6K | 0 | -51.6K |
| XTX Topco Ltd | New | 0 | 49.3K | +49.3K |
| Walleye Capital LLC | New | 0 | 49.1K | +49.1K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Reduced | 58.9K | 10.7K | -48.1K |
| ALGERT GLOBAL LLC | New | 0 | 46.0K | +46.0K |
| Quadrature Capital Ltd | New | 0 | 44.0K | +44.0K |
| Nuveen, LLC | Sold Out | 36.8K | 0 | -36.8K |
| HSBC HOLDINGS PLC | New | 0 | 33.7K | +33.7K |
| HRT FINANCIAL LP | New | 0 | 30.6K | +30.6K |
| OCCUDO QUANTITATIVE STRATEGIES LP | Sold Out | 29.3K | 0 | -29.3K |
| CAPTRUST FINANCIAL ADVISORS | New | 0 | 26.8K | +26.8K |
| LEVIN CAPITAL STRATEGIES, L.P. | Sold Out | 25.0K | 0 | -25.0K |
| IEQ CAPITAL, LLC | New | 0 | 24.4K | +24.4K |
| Verdad Advisers, LP | Sold Out | 22.7K | 0 | -22.7K |
| Pathstone Holdings, LLC | New | 0 | 22.3K | +22.3K |
| UBS Group AG | Increased | 7.7K | 29.5K | +21.9K |
| WELLINGTON MANAGEMENT GROUP LLP | Reduced | 68.4K | 47.5K | -20.9K |
| BARCLAYS PLC | Increased | 5.6K | 25.6K | +20.0K |
| Centiva Capital, LP | Increased | 111.1K | 130.9K | +19.8K |
| MORGAN STANLEY | Reduced | 152.7K | 133.6K | -19.2K |
| Sanctuary Advisors, LLC | Sold Out | 16.7K | 0 | -16.7K |
| RHUMBLINE ADVISERS | Reduced | 32.9K | 16.6K | -16.3K |
| Connor, Clark & Lunn Investment Management Ltd. | Increased | 14.5K | 28.6K | +14.1K |
| AXQ CAPITAL, LP | New | 0 | 13.9K | +13.9K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 36.3K | 49.9K | +13.6K |
| Mariner, LLC | Reduced | 26.9K | 13.3K | -13.6K |
| SEI INVESTMENTS CO | Sold Out | 13.6K | 0 | -13.6K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.