Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

MAMMOTH ENERGY SERVICES, INC.

CIK 0001679268TUSK· quarter ending 2026-06-30

Shares outstanding

48,127,585

as of 2026-08-04 · 10-Q cover page, filed 2026-08-07

Held by 13F filers

26,076,604

54.2% of shares outstanding

Holders

+3 vs 2026-03-31 · 27 new, 24 exited

Value

$84.7M

shares -25.6% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-07, as of 2026-08-04)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common stock	TUSK · NASDAQ	48,127,585	26,076,604	54.2%	93	56155L108

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	56155L108	COM	93	26,076,604	48,127,585	54.2%	$84.7M	1 call / 0 put	13DG	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (93 of 93 · 56155L108)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	WEXFORD CAPITAL LP	12,071,823	25.08%	$39.2M	-9,996,389 (-45.3%)
2	ADAGE CAPITAL PARTNERS GP, L.L.C.	4,575,000	9.51%	$14.9M	—
3	VANGUARD CAPITAL MANAGEMENT LLC	1,059,603	2.20%	$3.4M	+240,483 (+29.4%)
4	Peapod Lane Capital LLC	807,804	1.68%	$2.6M	+207,999 (+34.7%)
5	DIMENSIONAL FUND ADVISORS LP	691,667	1.44%	$2.2M	+5,468 (+0.8%)
6	JANE STREET GROUP, LLC	506,662	1.05%	$1.6M	+483,808 (+2117.0%)
7	CITADEL ADVISORS LLC	452,163	0.94%	$1.5M	+120,796 (+36.5%)
8	BlackRock, Inc.	407,976	0.85%	$1.3M	-1,046,863 (-72.0%)
9	MARSHALL WACE, LLP	395,583	0.82%	$1.3M	NEW
10	Johns Hopkins University	387,359	0.80%	$1.3M	NEW
11	BRIDGEWAY CAPITAL MANAGEMENT, LLC	332,313	0.69%	$1.1M	—
12	Russell Investments Group, Ltd.	329,821	0.69%	$1.1M	+261,791 (+384.8%)
13	GEODE CAPITAL MANAGEMENT, LLC	306,028	0.64%	$996K	-304,898 (-49.9%)
14	RENAISSANCE TECHNOLOGIES LLC	292,280	0.61%	$950K	+60,308 (+26.0%)
15	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	290,096	0.60%	$943K	NEW
16	Empowered Funds, LLC	241,313	0.50%	$784K	—
17	AQR CAPITAL MANAGEMENT LLC	177,824	0.37%	$578K	+111,093 (+166.5%)
18	VANGUARD FIDUCIARY TRUST CO	161,791	0.34%	$526K	-8,340 (-4.9%)
19	Round Rock Advisors LLC	152,841	0.32%	$497K	NEW
20	MORGAN STANLEY	133,560	0.28%	$434K	-19,163 (-12.5%)
21	Centiva Capital, LP	130,870	0.27%	$425K	+19,762 (+17.8%)
22	GSA CAPITAL PARTNERS LLP	129,547	0.27%	$421K	+115,638 (+831.4%)
23	MILLENNIUM MANAGEMENT LLC	124,186	0.26%	$404K	NEW
24	ACADIAN ASSET MANAGEMENT LLC	122,050	0.25%	$396K	-82,055 (-40.2%)
25	Marquette Asset Management, LLC	109,826	0.23%	$357K	NEW
26	STIFEL FINANCIAL CORP	105,572	0.22%	$343K	—
27	STATE STREET CORP	101,864	0.21%	$331K	-320,058 (-75.9%)
28	BANK OF AMERICA CORP /DE/	97,046	0.20%	$315K	+71,457 (+279.2%)
29	BNP PARIBAS FINANCIAL MARKETS	92,964	0.19%	$302K	+76,217 (+455.1%)
30	FNY Investment Advisers, LLC	76,481	0.16%	$248K	NEW
31	Point72 Asset Management, L.P.	72,091	0.15%	$234K	NEW
32	Boston Partners	68,935	0.14%	$224K	-85,453 (-55.3%)
33	Aster Capital Management (DIFC) Ltd	67,570	0.14%	$220K	NEW
34	Bank of New York Mellon Corp	62,007	0.13%	$202K	-70,532 (-53.2%)
35	Qube Research & Technologies Ltd	58,859	0.12%	$191K	NEW
36	TWO SIGMA INVESTMENTS, LP	58,538	0.12%	$190K	NEW
37	NORTHERN TRUST CORP	57,180	0.12%	$186K	-129,948 (-69.4%)
38	GOLDMAN SACHS GROUP INC	54,928	0.11%	$179K	-168,561 (-75.4%)
39	SUSQUEHANNA INTERNATIONAL GROUP, LLP	49,920	0.10%	$162K	+13,621 (+37.5%)
40	XTX Topco Ltd	49,261	0.10%	$160K	NEW
41	Walleye Capital LLC	49,141	0.10%	$160K	NEW
42	WELLINGTON MANAGEMENT GROUP LLP	47,486	0.10%	$154K	-20,929 (-30.6%)
43	ALGERT GLOBAL LLC	45,997	0.10%	$149K	NEW
44	Quadrature Capital Ltd	44,015	0.09%	$143K	NEW
45	HSBC HOLDINGS PLC	33,706	0.07%	$108K	NEW
46	HRT FINANCIAL LP	30,632	0.06%	$99K	NEW
47	UBS Group AG	29,518	0.06%	$96K	+21,851 (+285.0%)
48	Connor, Clark & Lunn Investment Management Ltd.	28,581	0.06%	$93K	+14,071 (+97.0%)
49	CAPTRUST FINANCIAL ADVISORS	26,799	0.06%	$87K	NEW
50	BARCLAYS PLC	25,553	0.05%	$83K	+19,972 (+357.9%)
51	IEQ CAPITAL, LLC	24,392	0.05%	$79K	NEW
52	Pathstone Holdings, LLC	22,336	0.05%	$73K	NEW
53	Schonfeld Strategic Advisors LLC	16,864	0.04%	$55K	-1,461 (-8.0%)
54	RHUMBLINE ADVISERS	16,609	0.03%	$54K	-16,254 (-49.5%)
55	Archer Investment Corp	16,400	0.03%	$53K	+5,200 (+46.4%)
56	AXQ CAPITAL, LP	13,903	0.03%	$45K	NEW
57	Tower Research Capital LLC (TRC)	13,477	0.03%	$44K	+955 (+7.6%)
58	Creative Planning	13,317	0.03%	$43K	-3,633 (-21.4%)
59	Mariner, LLC	13,287	0.03%	$43K	-13,586 (-50.6%)
60	Virtu Financial LLC	12,793	0.03%	$42K	NEW
61	FMR LLC	12,531	0.03%	$41K	+389 (+3.2%)
62	JPMORGAN CHASE & CO	12,385	0.03%	$36K	+2,110 (+20.5%)
63	STEINBERGANNA WEALTH MANAGEMENT	11,560	0.02%	$38K	-6,800 (-37.0%)
64	PRELUDE CAPITAL MANAGEMENT, LLC	10,800	0.02%	$35K	NEW
65	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	10,739	0.02%	$35K	-48,122 (-81.8%)
66	Vanguard Global Advisers, LLC	8,774	0.02%	$29K	—
67	PNC Financial Services Group, Inc.	7,217	0.01%	$23K	+1,497 (+26.2%)
68	ROYAL BANK OF CANADA	4,537	0.01%	$14K	+4,536 (+453600.0%)
69	SIMPLEX TRADING, LLC	3,457	0.01%	$11K	-2,081 (-37.6%)
70	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	1,416	0.00%	$5K	—
71	Arax Advisory Partners	843	0.00%	$3K	+826 (+4858.8%)
72	Allworth Financial LP	840	0.00%	$3K	+638 (+315.8%)
73	Allianz SE	800	0.00%	$3K	—
74	GROUP ONE TRADING LLC	777	0.00%	$3K	NEW
75	WELLS FARGO & COMPANY/MN	300	0.00%	$975	-9,169 (-96.8%)
76	EverSource Wealth Advisors, LLC	276	0.00%	$898	+192 (+228.6%)
77	ROTHSCHILD INVESTMENT LLC	239	0.00%	$777	+106 (+79.7%)
78	Essential Partners LLC	212	0.00%	$689	+192 (+960.0%)
79	MCGUIRE CAPITAL ADVISORS INC	200	0.00%	$650	NEW
80	Westside Investment Management, Inc.	187	0.00%	$608	—
81	OSAIC HOLDINGS, INC.	150	0.00%	$487	-72,269 (-99.8%)
82	Farther Finance Advisors, LLC	107	0.00%	$343	+93 (+664.3%)
83	Basecamp Wealth Advisors LLC	79	0.00%	$257	+22 (+38.6%)
84	True Wealth Design, LLC	37	0.00%	$121	+12 (+48.0%)
85	Transamerica Financial Advisors, LLC	31	0.00%	$100	—
86	SJS Investment Consulting Inc.	30	0.00%	$98	+13 (+76.5%)
87	IFP Advisors, Inc	27	0.00%	$88	+22 (+440.0%)
88	Wealth Enhancement Trust Services, Inc.	17	0.00%	$55	NEW
89	Caitong International Asset Management Co., Ltd	10	0.00%	$32	+8 (+400.0%)
90	JPL Wealth Management, LLC	9	0.00%	$30	—
91	Fortitude Family Office, LLC	7	0.00%	$23	NEW
92	CITIGROUP INC	1	0.00%	$3	-1,126 (-99.9%)
93	SBI Securities Co., Ltd.	1	0.00%	$3	-100 (-99.0%)

Exited since 2026-03-31 (24 filers; largest 24 shown)

LOS ANGELES CAPITAL MANAGEMENT LLC	−163,259
VANGUARD PORTFOLIO MANAGEMENT LLC	−140,145
Squarepoint Ops LLC	−51,620
Nuveen, LLC	−36,843
OCCUDO QUANTITATIVE STRATEGIES LP	−29,336
LEVIN CAPITAL STRATEGIES, L.P.	−25,000
Verdad Advisers, LP	−22,729
Sanctuary Advisors, LLC	−16,676
SEI INVESTMENTS CO	−13,579
PRICE T ROWE ASSOCIATES INC /MD/	−13,385
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	−12,570
ALLIANCEBERNSTEIN L.P.	−10,950
VALUEWORKS LLC	−10,720
NEW YORK STATE COMMON RETIREMENT FUND	−10,696
Police & Firemen's Retirement System of New Jersey	−9,637
CWM, LLC	−5,793
Legal & General Group Plc	−2,179
Ameritas Investment Partners, Inc.	−1,924
Sterling Capital Management LLC	−803
Advisory Services Network, LLC	−500
Optiver Holding B.V.	−200
MAI Capital Management	−168
Root Financial Partners, LLC	−32
Wealth Preservation Advisors, LLC	−15

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
CD Holding Company, LLC	SCHEDULE 13G	2026-06-22	2026-06-17	4,066,610	8.44%
Charles E. Davidson	SCHEDULE 13G	2026-06-22	2026-06-17	6,470,441	13.43%
Joseph M. Jacobs	SCHEDULE 13G/A	2026-06-22	2026-06-17	12,071,823	25.06%
Wexford Capital LP	SCHEDULE 13G/A	2026-06-22	2026-06-17	12,071,823	25.06%
Wexford GP LLC	SCHEDULE 13G/A	2026-06-22	2026-06-17	12,071,823	25.06%
CHARLES LEMONIDES	SCHEDULE 13G/A	2025-08-14	2025-06-30	2,389,031	4.96%
VALUEWORKS CAPITAL, LLC	SCHEDULE 13G/A	2025-08-14	2025-06-30	1,891,521	3.93%
VALUEWORKS LIMITED PARTNERS, LP	SCHEDULE 13G/A	2025-08-14	2025-06-30	1,891,521	3.93%
VALUEWORKS LLC	SCHEDULE 13G/A	2025-08-14	2025-06-30	2,389,031	4.96%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.