Mammoth Energy Services, Inc. (TUSK) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

48,253,659Shares Outstanding

26,884,131Shares held by institutions

$59,951,612Value of institutional holdings

70.89%Institutional ownership %

-3.97%Shares Changed QoQ

67No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

A total of 67 institutions have reported a stake in Mammoth Energy Services, Inc. (NASDAQ:TUSK) as of December 2025, according to recent 13F filings with the SEC.

The collective stake of institutional investors in Mammoth Energy Services moved to 70.9% in December 2025, a shift down from the 74.7% reported for September 2025.
Institutional share ownership changed by -3.97% QoQ, while the number of institutional owners saw no change YoY.
During the quarter, 30 institutions bought more Mammoth Energy Services shares, 23 sold shares, and 14 of the 67 total investors held their position steady.
Collectively, institutional investors decreased their stake in Mammoth Energy Services to 34.21Mn shares as of December 2025, a change that is down by 1.41Mn shares quarter on quarter and down 3.33Mn shares year over year.
With 22.10Mn shares, WEXFORD CAPITAL LP commands the largest institutional position in Mammoth Energy Services as of December 31, 2025, equating to 45.79% of the company.
Among the most significant buyers of Mammoth Energy Services during December 2025 were Russell Investments Group, Ltd. (245.40K), MORGAN STANLEY (147.40K), VANGUARD GROUP INC (76.78K), Squarepoint Ops LLC (76.16K), LANDSCAPE CAPITAL MANAGEMENT, L.L.C. (72.62K).
Leading sellers of Mammoth Energy Services stock in December 2025 included VALUEWORKS LLC (2.03Mn), DIMENSIONAL FUND ADVISORS LP (236.74K), ROYAL BANK OF CANADA (83.03K), SUSQUEHANNA INTERNATIONAL GROUP, LLP (62.61K), CITADEL ADVISORS LLC (48.20K).
The top 10 institutional holders of Mammoth Energy Services for the quarter ending December 2025 included WEXFORD CAPITAL LP (22.10Mn), 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), BRIDGEWAY CAPITAL MANAGEMENT, LLC (409.99K), STATE STREET CORP (408.48K), MORGAN STANLEY (292.70K), Russell Investments Group, Ltd. (247.49K).

67 Institutional Holders

26,884,131 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
WEXFORD CAPITAL LP	31 Dec, 2025	22,096,068	0	0.00%	$40,877,721.00
ADAGE CAPITAL PARTNERS GP, L.L.C.	31 Dec, 2025	4,575,000	0	0.00%	$8,463,750.00
BlackRock, Inc.	31 Dec, 2025	1,473,044	20,581	1.42%	$2,725,131.00
VANGUARD GROUP INC	31 Dec, 2025	1,022,411	76,781	8.12%	$1,891,461.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	699,678	-236,736	-25.28%	$1,294,365.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	585,719	6,614	1.14%	$1,083,694.00
BRIDGEWAY CAPITAL MANAGEMENT, LLC	31 Dec, 2025	409,991	20,027	5.14%	$758,483.00
STATE STREET CORP	31 Dec, 2025	408,484	1,568	0.39%	$755,695.00
MORGAN STANLEY	31 Dec, 2025	292,698	147,398	101.44%	$541,492.00
Russell Investments Group, Ltd.	31 Dec, 2025	247,491	245,400	11,736.01%	$457,858.00
CITADEL ADVISORS LLC	31 Dec, 2025	220,111	-48,204	-17.97%	$407,205.00
Empowered Funds, LLC	31 Dec, 2025	218,991	20,027	10.07%	$405,133.00
RENAISSANCE TECHNOLOGIES LLC	31 Dec, 2025	186,072	52,100	38.89%	$344,233.00
NORTHERN TRUST CORP	31 Dec, 2025	167,845	-24,624	-12.79%	$310,514.00
JPMORGAN CHASE & CO	31 Dec, 2025	165,984	-16,797	-9.19%	$307,070.00
Bank of New York Mellon Corp	31 Dec, 2025	132,674	-1,081	-0.81%	$245,447.00
ACADIAN ASSET MANAGEMENT LLC	31 Dec, 2025	106,892	66,650	165.62%	$195.00
STIFEL FINANCIAL CORP	31 Dec, 2025	105,572	-297	-0.28%	$195,308.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	89,944	37,863	72.70%	$166,396.00
OSAIC HOLDINGS, INC.	31 Dec, 2025	79,686	48,583	156.20%	$147,390.00

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