Mammoth Energy Services TUSK Institutional Ownership

NASDAQ TUSK

$3.15 -0.02 (-0.63%)

As of: Sep 10, 2026 · 11:11 AM EDT

Institutions by Trading Activity

94 Institutions

Increased 60 63.8%

Unchanged 10 10.6%

Reduced 24 25.5%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

54.02%

▼-18.53 pp QoQ

Shares Held by Institutions

26.02Mn

of 48.16Mn outstanding

▼-24.55% QoQ

Shares Outstanding

48.16Mn

22.14Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▲+4 vs prior quarter

Net Shares Added (QoQ)

-8.47Mn

distributed since last quarter

Value of Holdings

$81.18Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Mammoth Energy Services, Inc. (NASDAQ:TUSK) appears in 94 institutional 13F filings for the quarter ending June 2026.

These investors collectively held 54.0% of Mammoth Energy Services's outstanding shares in June 2026, down from 72.6% in March 2026.
Their total shares held in TUSK decreased -24.55% quarter over quarter, and separately, investors owning Mammoth Energy Services increased 46.88% from a year ago.
Of these 94 funds, 60 grew their exposure to Mammoth Energy Services, 24 cut back, and 10 maintained positions.
Institutional investors collectively held 26.02Mn shares in Mammoth Energy Services as of June 2026, down by 8.47Mn shares quarter on quarter, and down 10.35Mn shares year over year.
As of June 30, 2026, the biggest holder of Mammoth Energy Services is WEXFORD CAPITAL LP at 12.07Mn shares, representing 25.06% of shares outstanding.
The biggest buyers of Mammoth Energy Services for the quarter ending June 2026 included JANE STREET GROUP, LLC (483.81K), MARSHALL WACE, LLP (395.58K), Johns Hopkins University (387.36K), ARROWSTREET CAPITAL, LIMITED PARTNERSHIP (290.1K), Russell Investments Group, Ltd. (261.79K).
The largest sales of TUSK for the quarter ending June 2026 came from WEXFORD CAPITAL LP (10.0Mn), BlackRock, Inc. (1.05Mn), State Street Corp (320.06K), GEODE CAPITAL MANAGEMENT, LLC (304.9K), Goldman Sachs Group Inc (168.56K).
According to Business Quant data, leading holders of TUSK for June 2026 are WEXFORD CAPITAL LP (12.07Mn), ADAGE CAPITAL PARTNERS GP, L.L.C. (4.58Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.06Mn), Peapod Lane Capital LLC (807.8K), DIMENSIONAL FUND ADVISORS LP (691.67K), JANE STREET GROUP, LLC (506.66K), CITADEL ADVISORS LLC (452.16K), BlackRock, Inc. (407.98K), MARSHALL WACE, LLP (395.58K), Johns Hopkins University (387.36K).

Form 13F Holdings

94 Institutional Holders

Report period 30 Jun, 2026

Total shares held 26.02Mn

Of outstanding 54.02%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	WEXFORD CAPITAL LP	0001048462	12,071,823	25.06%	▼9,996,389	-45.30%	$39.23Mn
2	ADAGE CAPITAL PARTNERS GP, L.L.C.	0001165408	4,575,000	9.50%	0	0.00%	$14.87Mn
3	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	1,059,603	2.20%	▲240,483	+29.36%	$3.44Mn
4	Peapod Lane Capital LLC	0002050979	807,804	1.68%	▲207,999	+34.68%	$2.63Mn
5	DIMENSIONAL FUND ADVISORS LP	0000354204	691,667	1.44%	▲5,468	+0.80%	$2.25Mn
6	JANE STREET GROUP, LLC	0001595888	506,662	1.05%	▲483,808	+2,116.95%	$1.65Mn
7	CITADEL ADVISORS LLC	0001423053	452,163	0.94%	▲120,796	+36.45%	$1.47Mn
8	BlackRock, Inc.	0002012383	407,976	0.85%	▼1,046,863	-71.96%	$1.33Mn
9	MARSHALL WACE, LLP	0001318757	395,583	0.82%	▲395,583	0.00%	$1.29Mn
10	Johns Hopkins University	0001764756	387,359	0.80%	▲387,359	0.00%	$1.26Mn
11	BRIDGEWAY CAPITAL MANAGEMENT, LLC	0001107261	332,313	0.69%	0	0.00%	$1.08Mn
12	Russell Investments Group, Ltd.	0001692234	329,821	0.68%	▲261,791	+384.82%	$1.07Mn
13	GEODE CAPITAL MANAGEMENT, LLC	0001214717	306,028	0.64%	▼304,898	-49.91%	$995.73K
14	RENAISSANCE TECHNOLOGIES LLC	0001037389	292,280	0.61%	▲60,308	+26.00%	$949.91K
15	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	0001164508	290,096	0.60%	▲290,096	0.00%	$942.81K
16	Empowered Funds, LLC	0001592828	241,313	0.50%	0	0.00%	$784.27K
17	AQR CAPITAL MANAGEMENT LLC	0001167557	177,824	0.37%	▲111,093	+166.48%	$577.93K
18	VANGUARD FIDUCIARY TRUST CO	0000933478	161,791	0.34%	▼8,340	-4.90%	$525.82K
19	Round Rock Advisors LLC	0001846991	152,841	0.32%	▲152,841	0.00%	$496.73K
20	Morgan Stanley	0000895421	133,560	0.28%	▼19,163	-12.55%	$434.07K

Showing 1 to 20 of 94 holders