MAMMOTH ENERGY SERVICES, INC. (TUSK) — Institutional Holders, Q2 2026

94 institutional investment managers reported a TUSK position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $84.7M. Every filer is listed below, ranked by position value. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.

← TUSK stock profile

TUSK in Q2 2026: what funds did

Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.

New positions

Added to

Trimmed

Sold out

Biggest buyers

JANE STREET GROUPAdded · +483,808 sh+$1.6M
MARSHALL WACE, LLPNew · +395,583 sh+$1.3M
Johns Hopkins UniversityNew · +387,359 sh+$1.3M
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPNew · +290,096 sh+$942.8K
Russell Investments Group, Ltd.Added · +261,791 sh+$850.8K

Biggest sellers

WEXFORD CAPITALTrimmed · -9,996,389 sh-$32.5M
BlackRockTrimmed · -1,046,863 sh-$3.4M
STATE STREETTrimmed · -320,058 sh-$1.0M
GEODE CAPITAL MANAGEMENTTrimmed · -304,898 sh-$990.9K
GOLDMAN SACHS GROUPTrimmed · -168,561 sh-$547.8K

TUSK 13F holders ranked 1–94 of 94

Institutional investors reporting a position in MAMMOTH ENERGY SERVICES, INC. on SEC Form 13F-HR for Q2 2026, ranked by reported value.
#	Institution	Shares	Value	% of portfolio	QoQShares vs Q1 2026
1	WEXFORD CAPITAL#1 · 12,071,823 sh	12,071,823	$39.2M	5.02%	-45.3%
2	ADAGE CAPITAL PARTNERS GP, L.L.C.#2 · 4,575,000 sh	4,575,000	$14.9M	0.02%	0.0%
3	VANGUARD CAPITAL MANAGEMENT#3 · 1,059,603 sh	1,059,603	$3.4M	<0.01%	+29.4%
4	Peapod Lane Capital#4 · 807,804 sh	807,804	$2.6M	—	+34.7%
5	DIMENSIONAL FUND ADVISORS#5 · 691,667 sh	691,667	$2.2M	<0.01%	+0.8%
6	JANE STREET GROUP#6 · 506,662 sh	506,662	$1.6M	<0.01%	+2117.0%
7	CITADEL ADVISORS#7 · 452,163 sh	452,163	$1.5M	<0.01%	+36.5%
8	BlackRock#8 · 407,976 sh	407,976	$1.3M	0.00%	-72.0%
9	MARSHALL WACE, LLP#9 · 395,583 sh	395,583	$1.3M	<0.01%	New
10	Johns Hopkins University#10 · 387,359 sh	387,359	$1.3M	0.08%	New
11	BRIDGEWAY CAPITAL MANAGEMENT#11 · 332,313 sh	332,313	$1.1M	0.02%	0.0%
12	Russell Investments Group, Ltd.#12 · 329,821 sh	329,821	$1.1M	<0.01%	+384.8%
13	GEODE CAPITAL MANAGEMENT#13 · 306,028 sh	306,028	$995.7K	<0.01%	-49.9%
14	RENAISSANCE TECHNOLOGIES#14 · 292,280 sh	292,280	$949.9K	<0.01%	+26.0%
15	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP#15 · 290,096 sh	290,096	$942.8K	<0.01%	New
16	Empowered Funds#16 · 241,313 sh	241,313	$784.3K	<0.01%	0.0%
17	AQR CAPITAL MANAGEMENT#17 · 177,824 sh	177,824	$577.9K	<0.01%	+166.5%
18	VANGUARD FIDUCIARY#18 · 161,791 sh	161,791	$525.8K	<0.01%	-4.9%
19	Round Rock Advisors#19 · 152,841 sh	152,841	$496.7K	0.06%	New
20	MORGAN STANLEY#20 · 133,560 sh	133,560	$434.1K	0.00%	-12.5%
21	Centiva Capital#21 · 130,870 sh	130,870	$425.3K	<0.01%	+17.8%
22	GSA CAPITAL PARTNERS LLP#22 · 129,547 sh	129,547	$421.0K	0.03%	+831.4%
23	MILLENNIUM MANAGEMENT#23 · 124,186 sh	124,186	$403.6K	<0.01%	New
24	ACADIAN ASSET MANAGEMENT#24 · 122,050 sh	122,050	$396.0K	<0.01%	-40.2%
25	Marquette Asset Management#25 · 109,826 sh	109,826	$356.9K	—	New
26	STIFEL FINANCIAL#26 · 105,572 sh	105,572	$343.1K	<0.01%	0.0%
27	STATE STREET#27 · 101,864 sh	101,864	$331.1K	0.00%	-75.9%
28	BANK OF AMERICA#28 · 97,046 sh	97,046	$315.4K	0.00%	+279.2%
29	BNP PARIBAS FINANCIAL MARKETS#29 · 92,964 sh	92,964	$302.1K	<0.01%	+455.1%
30	FNY Investment Advisers#30 · 76,481 sh	76,481	$248.0K	—	New
31	Point72 Asset Management, L.P.#31 · 72,091 sh	72,091	$234.3K	<0.01%	New
32	Boston Partners#32 · 68,935 sh	68,935	$224.0K	<0.01%	-55.3%
33	Aster Capital Management (DIFC) Ltd#33 · 67,570 sh	67,570	$219.6K	0.05%	New
34	Bank of New York Mellon#34 · 62,007 sh	62,007	$201.5K	0.00%	-53.2%
35	Qube Research & Technologies Ltd#35 · 58,859 sh	58,859	$191.3K	<0.01%	New
36	TWO SIGMA INVESTMENTS#36 · 58,538 sh	58,538	$190.2K	<0.01%	New
37	NORTHERN#37 · 57,180 sh	57,180	$185.8K	0.00%	-69.4%
38	GOLDMAN SACHS GROUP#38 · 54,928 sh	54,928	$178.5K	0.00%	-75.4%
39	SUSQUEHANNA INTERNATIONAL GROUP, LLP#39 · 49,920 sh	49,920	$162.2K	0.00%	+37.5%
40	XTX Topco Ltd#40 · 49,261 sh	49,261	$160.1K	<0.01%	New
41	Walleye Capital#41 · 49,141 sh	49,141	$159.7K	<0.01%	New
42	WELLINGTON MANAGEMENT GROUP LLP#42 · 47,486 sh	47,486	$154.3K	0.00%	-30.6%
43	ALGERT GLOBAL#43 · 45,997 sh	45,997	$149.5K	<0.01%	New
44	Quadrature Capital Ltd#44 · 44,015 sh	44,015	$143.0K	<0.01%	New
45	HSBC PLC#45 · 33,706 sh	33,706	$108.0K	0.00%	New
46	HRT FINANCIAL#46 · 30,632 sh	30,632	$99.0K	<0.01%	New
47	UBS Group AG#47 · 29,518 sh	29,518	$95.9K	0.00%	+285.0%
48	Connor, Clark & Lunn Investment Management Ltd.#48 · 28,581 sh	28,581	$92.9K	<0.01%	+97.0%
49	CAPTRUST FINANCIAL ADVISORS#49 · 26,799 sh	26,799	$87.1K	<0.01%	New
50	BARCLAYS PLC#50 · 25,553 sh	25,553	$83.0K	0.00%	+357.9%
51	IEQ CAPITAL#51 · 24,392 sh	24,392	$79.3K	<0.01%	New
52	Pathstone#52 · 22,336 sh	22,336	$72.6K	<0.01%	New
53	Schonfeld Strategic Advisors#53 · 16,864 sh	16,864	$54.8K	<0.01%	-8.0%
54	RHUMBLINE ADVISERS#54 · 16,609 sh	16,609	$54.0K	0.00%	-49.5%
55	AXQ CAPITAL#55 · 13,903 sh	13,903	$45.2K	<0.01%	New
56	Tower Research Capital (TRC)#56 · 13,477 sh	13,477	$43.8K	<0.01%	+7.6%
57	Creative Planning#57 · 13,317 sh	13,317	$43.3K	0.00%	-21.4%
58	Mariner#58 · 13,287 sh	13,287	$43.1K	0.00%	-50.6%
59	Virtu Financial#59 · 12,793 sh	12,793	$42.0K	<0.01%	New
60	FMR#60 · 12,531 sh	12,531	$40.7K	0.00%	+3.2%
61	STEINBERGANNA WEALTH MANAGEMENT#61 · 11,560 sh	11,560	$37.6K	—	-37.0%
62	JPMORGAN CHASE#62 · 12,385 sh	12,385	$36.0K	0.00%	+20.5%
63	PRELUDE CAPITAL MANAGEMENT#63 · 10,800 sh	10,800	$35.1K	<0.01%	New
64	CHARLES SCHWAB INVESTMENT MANAGEMENT#64 · 10,739 sh	10,739	$34.9K	0.00%	-81.8%
65	Vanguard Global Advisers#65 · 8,774 sh	8,774	$28.5K	0.00%	0.0%
66	Archer Investment#66 · 8,200 sh	8,200	$26.6K	<0.01%	-26.8%
67	PNC FINANCIAL SERVICES GROUP#67 · 7,217 sh	7,217	$23.5K	0.00%	+26.2%
68	ROYAL BANK OF CANADA#68 · 4,537 sh	4,537	$14.0K	0.00%	New
69	SIMPLEX TRADING#69 · 3,457 sh	3,457	$11.2K	0.00%	-37.6%
70	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME#70 · 1,416 sh	1,416	$4.6K	0.00%	0.0%
71	SRS Capital Advisors#71 · 843 sh	843	$2.7K	0.00%	+4858.8%
72	Allworth Financial#72 · 840 sh	840	$2.7K	0.00%	+315.8%
73	ALLIANZ SE#73 · 800 sh	800	$2.6K	0.00%	0.0%
74	GROUP ONE TRADING, L.P.#74 · 777 sh	777	$2.5K	0.00%	New
75	Integrated Wealth Concepts#75 · 524 sh	524	$1.7K	0.00%	New
76	WELLS FARGO & COMPANY#76 · 300 sh	300	$975.00	0.00%	-96.8%
77	EverSource Wealth Advisors#77 · 276 sh	276	$898.00	0.00%	+190.5%
78	ROTHSCHILD INVESTMENT#78 · 239 sh	239	$777.00	0.00%	+79.7%
79	Essential Partners#79 · 212 sh	212	$689.00	—	+960.0%
80	MCGUIRE CAPITAL ADVISORS#80 · 200 sh	200	$650.00	<0.01%	New
81	Westside Investment Management#81 · 187 sh	187	$608.00	<0.01%	0.0%
82	OSAIC#82 · 150 sh	150	$487.00	0.00%	-99.8%
83	Farther Finance Advisors#83 · 107 sh	107	$343.00	—	+664.3%
84	Basecamp Wealth Advisors#84 · 79 sh	79	$257.00	0.00%	+38.6%
85	True Wealth Design#85 · 37 sh	37	$121.00	—	+48.0%
86	Transamerica Financial Advisors#86 · 31 sh	31	$100.00	0.00%	0.0%
87	SJS Investment Consulting#87 · 30 sh	30	$98.00	—	+76.5%
88	IFP Advisors#88 · 27 sh	27	$88.00	—	+440.0%
89	Wealth Enhancement Services#89 · 17 sh	17	$55.00	—	New
90	Caitong International Asset Management , Ltd#90 · 10 sh	10	$32.00	0.00%	+400.0%
91	JPL Wealth Management#91 · 9 sh	9	$30.00	0.00%	0.0%
92	Fortitude Family Office#92 · 7 sh	7	$23.00	—	New
93	SBI Securities , Ltd.#93 · 1 sh	1	$3.00	—	-99.0%
94	CITIGROUP#94 · 1 sh	1	$3.00	0.00%	-99.9%

Funds that sold out of TUSK in Q2 2026 (23)

Held TUSK at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.

Institutions that held TUSK in Q1 2026 and reported no position in Q2 2026.
Institution	Shares sold	Value in Q1 2026
LOS ANGELES CAPITAL MANAGEMENT163,259 sh	163,259	$400.0K
VANGUARD PORTFOLIO MANAGEMENT140,145 sh	140,145	$343.4K
Squarepoint Ops51,620 sh	51,620	$126.5K
Nuveen36,843 sh	36,843	$90.3K
OCCUDO QUANTITATIVE STRATEGIES29,336 sh	29,336	$83.9K
LEVIN CAPITAL STRATEGIES, L.P.25,000 sh	25,000	$61.3K
Verdad Advisers22,729 sh	22,729	$55.7K
Sanctuary Advisors16,676 sh	16,676	$40.9K
SEI INVESTMENTS13,579 sh	13,579	$33.3K
PRICE T ROWE ASSOCIATES13,385 sh	13,385	$33.0K
MIRAE ASSET GLOBAL ETFS Ltd.12,570 sh	12,570	$30.8K
VALUEWORKS10,720 sh	10,720	$26.3K
NEW YORK STATE COMMON RETIREMENT FUND10,696 sh	10,696	$26.2K
Police & Firemen's Retirement System of New Jersey9,637 sh	9,637	$23.6K
ALLIANCEBERNSTEIN L.P.10,950 sh	10,950	$20.3K
Legal & General Group Plc2,179 sh	2,179	$5.3K
Ameritas Investment Partners1,924 sh	1,924	$4.7K
Sterling Capital Management803 sh	803	$2.0K
Advisory Services Network500 sh	500	$1.2K
Optiver Holding B.V.200 sh	200	$490.00
MAI Capital Management168 sh	168	$412.00
Root Financial Partners32 sh	32	$78.00
Wealth Preservation Advisors15 sh	15	$37.00

Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.