Mammoth Energy Services, Inc. (TUSK) Institutional Ownership

Ownership Summary

Mammoth Energy Services, Inc. (NASDAQ:TUSK) has 71 institutional investors that have filed 13F reports for the period ending December 2025.

• These investors collectively held 71.7% of Mammoth Energy Services's outstanding shares in December 2025, down from 74.9% in September 2025.
• They decreased total shares held in Mammoth Energy Services by -3.33% from last quarter, and the number of investors in TUSK increased 5.97% annually.
• Among the 71 funds, 30 bought more Mammoth Energy Services shares, 27 sold down, and 14 held their ground.
• Combined, these investors held 34.67Mn shares in TUSK for December 2025, down by 1.19Mn shares quarter on quarter, and down 3.0Mn shares year over year.
• WEXFORD CAPITAL LP leads ownership in TUSK with 22.1Mn shares as of December 31, 2025, equal to 45.69% of outstanding shares.
• Leading buyers of Mammoth Energy Services shares for the quarter ending December 2025 were Russell Investments Group, Ltd. (245.4K), Empowered Funds, LLC (239.02K), Corient Private Wealth LLC (195.8K), Morgan Stanley (147.4K), VANGUARD GROUP INC (76.78K).
• Top sellers of TUSK stock for the quarter ending December 2025 included VALUEWORKS LLC (2.03Mn), DIMENSIONAL FUND ADVISORS LP (236.74K), Jpmorgan Chase & Co (199.58K), Royal Bank Of Canada (83.04K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (62.61K).
• Per Business Quant, the top 10 investors in TUSK for the quarter ending December 2025 include WEXFORD CAPITAL LP (22.1Mn), ADAGE CAPITAL PARTNERS GP, L.L.C. (4.58Mn), BlackRock, Inc. (1.47Mn), VANGUARD GROUP INC (1.02Mn), DIMENSIONAL FUND ADVISORS LP (699.68K), GEODE CAPITAL MANAGEMENT, LLC (585.72K), Empowered Funds, LLC (437.98K), BRIDGEWAY CAPITAL MANAGEMENT, LLC (409.99K), State Street Corp (408.48K), Morgan Stanley (292.7K).