TUSK · Mammoth Energy Services, Inc.

$3.12 +0.01 (+0.32%)

Market Cap

$149.68M

48.13M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP →

Quarter:

Holders: 94

Total Value: $85,182,545

Total Shares: 26,210,028

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 94 13F filers · Δ vs Mar 31, 2026

Top Holder

46.1%

−16.8 pts

Top 5

73.3%

−11.1 pts

Top 10

82.0%

−8.9 pts

HHI

2,486

Moderately concentrated−1,679

Quarterly Activity

vs Mar 31, 2026

New

Increased

Decreased

Sold Out

Unchanged

Holder count: +4

Institutional value: -0.9%

Shares held: -25.3%

Top Buyers

vs Mar 31, 2026

Institution	Added	Now Holds
Mega JANE STREET GROUP, LLC	+471,908	506,662
Mega Russell Investments Group, Ltd.	+261,791	329,821
Mega CITADEL ADVISORS LLC	+251,296	593,263
Mega VANGUARD CAPITAL MANAGEMENT LLC	+240,483	1,059,603
Small Peapod Lane Capital LLC	+207,999	807,804

Top Sellers

vs Mar 31, 2026

Institution	Sold	Now Holds
Small WEXFORD CAPITAL LP	−9,996,389	12,071,823
Mega BlackRock, Inc.	−1,046,863	407,976
Mega STATE STREET CORP	−320,058	101,864
Mega GEODE CAPITAL MANAGEMENT, LLC	−304,898	306,028
Mega GOLDMAN SACHS GROUP INC	−168,561	54,928

Top New Positions

vs Mar 31, 2026

Institution	Acquired	Value (USD)
Large MARSHALL WACE, LLP	395,583	$1,285,644
Small Johns Hopkins University	387,359	$1,258,916
Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	290,096	$942,812
Small Round Rock Advisors LLC	152,841	$496,733
Mega MILLENNIUM MANAGEMENT LLC	124,186	$403,604

Top Sold-Out Positions

vs Mar 31, 2026

Institution	Previously Held	Last Value (USD)
Large LOS ANGELES CAPITAL MANAGEMENT LLC	163,259	$399,984
Mega VANGUARD PORTFOLIO MANAGEMENT LLC	140,145	$343,355
Large Squarepoint Ops LLC	51,620	$126,469
Mega Nuveen, LLC	36,843	$90,264
Mid OCCUDO QUANTITATIVE STRATEGIES LP	29,336	$71,873

Filter: New 28 Increased 32 Reduced 24 Sold out 24 Unchanged 10

Showing 95 of 95

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

WEXFORD CAPITAL LP

$39,233,424

46.06%

12,071,823

ADAGE CAPITAL PARTNERS GP, L.L.C.

$14,868,750

17.46%

4,575,000

VANGUARD CAPITAL MANAGEMENT LLC

$3,443,709

4.04%

1,059,603

Peapod Lane Capital LLC

$2,625,363

3.08%

807,804

DIMENSIONAL FUND ADVISORS LP

$2,247,917

2.64%

691,667

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Dimensional Fund Advisors Ltd.	1,968	$6,396	0.3%	Defined
DFA Australia Ltd.	22,456	$72,982	3.2%	Defined
Dimensional Ireland Ltd	40,043	$130,139	5.8%	Defined
Held directly	627,200	$2,038,400	90.7%	Sole

JANE STREET GROUP, LLC

$1,646,651

1.93%

506,662

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Jane Street Capital, LLC	283,084	$920,023	55.9%	Defined
Jane Street Global Trading, LLC	223,578	$726,628	44.1%	Defined

CITADEL ADVISORS LLC

$1,469,529

1.73%

452,163

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	67,866	$220,564	15.0%	Defined
Held directly	384,297	$1,248,965	85.0%	Defined

BlackRock, Inc.

$1,325,920

1.56%

407,976

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BLACKROCK FINANCIAL MANAGEMENT INC/DE	38,571	$125,355	9.5%	Sole
BlackRock Investment Management, LLC	6,150	$19,987	1.5%	Sole
BlackRock Fund Advisors	86,748	$281,931	21.3%	Sole
BlackRock Institutional Trust Company, N.A.	274,581	$892,388	67.3%	Sole
Aperio Group, LLC	1,926	$6,259	0.5%	Sole

MARSHALL WACE, LLP

$1,285,644

1.51%

395,583

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Marshall Wace North America L.P. joint	395,583	$1,285,644	100.0%	Other

Johns Hopkins University

$1,258,916

1.48%

387,359

BRIDGEWAY CAPITAL MANAGEMENT, LLC

$1,080,017

1.27%

332,313

Russell Investments Group, Ltd.

$1,071,916

1.26%

329,821

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Russell Investment Management, LLC	201,116	$653,627	61.0%	Defined
Russell Investments Capital, LLC	29,452	$95,719	8.9%	Defined
Russell Investments France SAS	46,907	$152,447	14.2%	Defined
Russell Investments Limited	4,163	$13,529	1.3%	Defined
Russell Investments Trust Company	48,183	$156,594	14.6%	Defined

GEODE CAPITAL MANAGEMENT, LLC

$994,591

1.17%

306,028

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GEODE CAPITAL MANAGEMENT TRUST COMPANY, LLC	58,164	$189,033	19.0%	Defined
Held directly	247,864	$805,558	81.0%	Defined

RENAISSANCE TECHNOLOGIES LLC

$949,910

1.12%

292,280

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

$942,812

1.11%

290,096

Empowered Funds, LLC

$784,267

0.92%

241,313

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Bridgeway Capital Management, LLC	241,313	$784,267	100.0%	Other

AQR CAPITAL MANAGEMENT LLC

$577,926

0.68%

177,824

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RF&L WEALTH MANAGEMENT, LLC	9	$29	0.0%	Other
Prism Planning Partners LLC	53	$172	0.0%	Other
Compound Planning, Inc.	7	$22	0.0%	Other
Arax Advisory Partners	960	$3,120	0.5%	Other
HALBERT HARGROVE GLOBAL ADVISORS, LLC	934	$3,035	0.5%	Other
Stokes Family Office, LLC	413	$1,342	0.2%	Other
Held directly	175,448	$570,206	98.7%	Defined

VANGUARD FIDUCIARY TRUST CO

$525,820

0.62%

161,791

Round Rock Advisors LLC

$496,733

0.58%

152,841

CITADEL ADVISORS LLC

$458,575

0.54%

141,100

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	141,100	$458,575	100.0%	Defined

MORGAN STANLEY

$434,068

0.51%

133,560

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY & CO INTERNATIONAL PLC	2,055	$6,678	1.5%	Defined
MORGAN STANLEY & CO. LLC	1,149	$3,734	0.9%	Defined
MORGAN STANLEY CAPITAL SERVICES, LLC	18,137	$58,945	13.6%	Defined
MORGAN STANLEY SMITH BARNEY LLC	26,110	$84,857	19.5%	Defined
PARAMETRIC PORTFOLIO ASSOCIATES LLC	86,109	$279,854	64.5%	Defined

Centiva Capital, LP

$425,327

0.50%

130,870

GSA CAPITAL PARTNERS LLP

$421,027

0.49%

129,547

MILLENNIUM MANAGEMENT LLC

$403,604

0.47%

124,186

ACADIAN ASSET MANAGEMENT LLC

$396,662

0.47%

122,050

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Acadian Inc	122,050	$396,662	100.0%	Defined

Marquette Asset Management, LLC

$356,934

0.42%

109,826

STIFEL FINANCIAL CORP

$343,109

0.40%

105,572

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STIFEL NICOLAUS & CO INC \MO\	105,572	$343,109	100.0%	Defined

STATE STREET CORP

$331,058

0.39%

101,864

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STATE STREET GLOBAL ADVISORS TRUST COMPANY	101,864	$331,058	100.0%	Defined

BANK OF AMERICA CORP /DE/

$315,399

0.37%

97,046

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BANK OF AMERICA NA	97,046	$315,399	100.0%	Defined

BNP PARIBAS ARBITRAGE, SA

$302,133

0.35%

92,964

FNY Investment Advisers, LLC

$248,563

0.29%

76,481

Point72 Asset Management, L.P.

$234,295

0.28%

72,091

Boston Partners

$224,038

0.26%

68,935

Aster Capital Management (DIFC) Ltd

$219,602

0.26%

67,570

Bank of New York Mellon Corp

$201,522

0.24%

62,007

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
The Bank of New York Mellon	62,006	$201,519	100.0%	Defined
Held directly	1	$3	0.0%	Defined

Qube Research & Technologies Ltd

$191,291

0.22%

58,859

TWO SIGMA INVESTMENTS, LP

$190,248

0.22%

58,538

NORTHERN TRUST CORP

$185,834

0.22%

57,180

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
NORTHERN TRUST CO joint	57,180	$185,834	100.0%	Defined

GOLDMAN SACHS GROUP INC

$178,516

0.21%

54,928

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GOLDMAN SACHS & CO. LLC	54,928	$178,516	100.0%	Defined

SUSQUEHANNA INTERNATIONAL GROUP, LLP

$162,240

0.19%

49,920

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
SUSQUEHANNA SECURITIES, LLC	49,920	$162,240	100.0%	Other

XTX Topco Ltd

$160,098

0.19%

49,261

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
XTX EXECUTION SERVICES LLC joint	49,261	$160,098	100.0%	Defined

Walleye Capital LLC

$159,708

0.19%

49,141

WELLINGTON MANAGEMENT GROUP LLP

$154,329

0.18%

47,486

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Wellington Management International Ltd	47,486	$154,329	100.0%	Defined

ALGERT GLOBAL LLC

$149,490

0.18%

45,997

Quadrature Capital Ltd

$143,048

0.17%

44,015

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Quadrature US Inc.	44,015	$143,048	100.0%	Other

HSBC HOLDINGS PLC

$109,544

0.13%

33,706

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
HSBC BANK PLC	33,706	$109,544	100.0%	Defined

HRT FINANCIAL LP

$99,554

0.12%

30,632

UBS Group AG

$95,933

0.11%

29,518

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Financial Services Inc	9,361	$30,423	31.7%	Defined
UBS AG	20,157	$65,510	68.3%	Defined

Connor, Clark & Lunn Investment Management Ltd.

$92,888

0.11%

28,581

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Manager 1	28,581	$92,888	100.0%	Sole

CAPTRUST FINANCIAL ADVISORS

$87,096

0.10%

26,799

BARCLAYS PLC

$83,046

0.10%

25,553

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BARCLAYS BANK PLC	23,938	$77,798	93.7%	Defined
BARCLAYS CAPITAL INC.	1,615	$5,248	6.3%	Defined

IEQ CAPITAL, LLC

$79,274

0.09%

24,392

Pathstone Holdings, LLC

$72,592

0.09%

22,336

Schonfeld Strategic Advisors LLC

$54,808

0.06%

16,864

RHUMBLINE ADVISERS

$53,979

0.06%

16,609

AXQ CAPITAL, LP

$45,184

0.05%

13,903

Tower Research Capital LLC (TRC)

$43,800

0.05%

13,477

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Latour Trading LLC (Latour)	13,477	$43,800	100.0%	Defined

Creative Planning

$43,280

0.05%

13,317

Mariner, LLC

$43,182

0.05%

13,287

Virtu Financial LLC

$41,577

0.05%

12,793

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Virtu Americas LLC	12,793	$41,577	100.0%	Defined

FMR LLC

$40,725

0.05%

12,531

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fidelity Management & Research Co LLC	12,531	$40,725	100.0%	Defined

JPMORGAN CHASE & CO

$40,251

0.05%

12,385

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
JPMorgan Chase Bank, N.A.	569	$1,849	4.6%	Defined
J.P. Morgan Securities LLC	11,420	$37,115	92.2%	Defined
J.P. Morgan Securities plc	396	$1,287	3.2%	Defined

STEINBERGANNA WEALTH MANAGEMENT

$37,570

0.04%

11,560

PRELUDE CAPITAL MANAGEMENT, LLC

$35,100

0.04%

10,800

CHARLES SCHWAB INVESTMENT MANAGEMENT INC

$34,901

0.04%

10,739

Vanguard Global Advisers, LLC

$28,515

0.03%

8,774

Archer Investment Corp

$26,650

0.03%

8,200

PNC FINANCIAL SERVICES GROUP, INC.

$23,454

0.03%

7,217

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
PNC Bank, National Association	7,217	$23,454	100.0%	Defined

ROYAL BANK OF CANADA

$14,745

0.02%

4,537

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC CMA LTD.	96	$312	2.1%	Defined
RBC Capital Markets, LLC	4,404	$14,313	97.1%	Defined
Held directly	37	$120	0.8%	Sole

SIMPLEX TRADING, LLC

$11,235

0.01%

3,457

UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC

$4,602

0.01%

1,416

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Group AG	1,416	$4,602	100.0%	Defined

Arax Advisory Partners

$2,739

0.00%

843

Allworth Financial LP

$2,730

0.00%

840

Allianz SE

$2,600

0.00%

800

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
INVESTITORI SGR S.p.A.	800	$2,600	100.0%	Defined

GROUP ONE TRADING LLC

$2,525

0.00%

777

Integrated Wealth Concepts LLC

$1,703

0.00%

524

WELLS FARGO & COMPANY/MN

$975

0.00%

300

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO ADVISORS FINANCIAL NETWORK, LLC	300	$975	100.0%	Defined

EverSource Wealth Advisors, LLC

$895

0.00%

276

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
BMSS Wesson Wealth Solutions, LLC	48	$155	17.3%	Sole
Held directly	228	$740	82.7%	Sole

ROTHSCHILD INVESTMENT LLC

$776

0.00%

239

Essential Partners LLC

$689

0.00%

212

MCGUIRE CAPITAL ADVISORS INC

$650

0.00%

200

Westside Investment Management, Inc.

$607

0.00%

187

OSAIC HOLDINGS, INC.

$487

0.00%

150

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	150	$487	100.0%	Defined

Farther Finance Advisors, LLC

$347

0.00%

107

Basecamp Wealth Advisors LLC

$256

0.00%

True Wealth Design, LLC

$120

0.00%

Transamerica Financial Advisors, LLC

$100

0.00%

SJS Investment Consulting Inc.

$97

0.00%

IFP Advisors, Inc

$87

0.00%

Wealth Enhancement Trust Services, Inc.

$55

0.00%

Caitong International Asset Management Co., Ltd

$32

0.00%

JPL Wealth Management, LLC

$29

0.00%

Fortitude Family Office, LLC

$22

0.00%

SBI Securities Co., Ltd.

0.00%

CITIGROUP INC

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citigroup Financial Products Inc. joint	1	$3	100.0%	Defined

Key facts CIK 1679268 CUSIP 56155L108 13F (30d) 78 filings 78 filers Visit website Investor relations