Mammoth Energy Services TUSK Institutional Ownership

NASDAQ TUSK

$2.69 -0.07 (-2.53%)

As of: Oct 22, 2026 · 9:38 AM EDT

Institutions by Trading Activity

93 Institutions

Increased 59 63.4%

Unchanged 10 10.8%

Reduced 24 25.8%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

54.00%

▼-18.55 pp QoQ

Shares Held by Institutions

26.01Mn

of 48.16Mn outstanding

▼-25.82% QoQ

Shares Outstanding

48.16Mn

22.16Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▲+3 vs prior quarter

Net Shares Added (QoQ)

-9.05Mn

distributed since last quarter

Value of Holdings

$69.96Mn

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

Updated Oct 11, 2026

Mammoth Energy Services, Inc. (NASDAQ:TUSK) appeared in the 13F filings of 93 institutional investors for the quarter ended June 30, 2026.

Collectively, these holders controlled 54.00% of Mammoth Energy Services' outstanding shares in Q2 2026, down from 72.55% in Q1 2026.
Total holdings of TUSK shares fell 25.82% from Q1 2026, and the holder count rose 47.62% from Q2 2025.
Of the 93 holders, 59 added to their positions, 24 reduced their stakes and 10 left their positions unchanged in Q2 2026.
The aggregate institutional position in Mammoth Energy Services was 26.01Mn shares at the end of Q2 2026, down 9.05Mn from the prior quarter and down 10.06Mn from a year earlier.
Wexford Capital LP held the largest position in TUSK at 12.07Mn shares as of June 30, 2026, or 25.06% of shares outstanding.
Among holders that already owned Mammoth Energy Services, the biggest buyers in Q2 2026 were Jane Street Group, LLC (+483.81K shares), Russell Investments Group, Ltd. (+261.79K shares), Vanguard Capital Management LLC (+240.48K shares), Peapod Lane Capital LLC (+208K shares) and Citadel Advisors LLC (+120.8K shares).
Among holders that kept a stake in Mammoth Energy Services, the biggest sellers in Q2 2026 were Wexford Capital LP (-10Mn shares), BlackRock, Inc. (-1.05Mn shares), State Street Corp (-320.06K shares), Geode Capital Management, LLC (-304.9K shares) and Goldman Sachs Group Inc (-168.56K shares).
Mammoth Energy Services' 10 largest institutional shareholders as of Q2 2026 were Wexford Capital LP (12.07Mn shares), Adage Capital Partners GP, L.L.C. (4.58Mn shares), Vanguard Capital Management LLC (1.06Mn shares), Peapod Lane Capital LLC (807.8K shares), Dimensional Fund Advisors LP (691.67K shares), Jane Street Group, LLC (506.66K shares), Citadel Advisors LLC (452.16K shares), BlackRock, Inc. (407.98K shares), Marshall Wace, LLP (395.58K shares) and Johns Hopkins University (387.36K shares), per Business Quant data.

Form 13F Holdings

93 Institutional Holders

Report period 30 Jun, 2026

Total shares held 26.01Mn

Of outstanding 54.00%

#	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 93 holders