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TUSK

Mammoth Energy Services, Inc.

Company with tickers: TUSK

CIK
1679268
CUSIP
56155L108
Shares Outstanding
48,170,647
13F Activity (30d)
81 filings 79 filers
Holders: 89
Total Value: $85,961,245
Total Shares: 35,086,244

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 89 13F filers · Δ vs Dec 31, 2025
Top Holder
62.9%
Jun 2023 → Mar 2026 · range 53.7% – 64.3%
−1.4 pts
Top 5
84.4%
Jun 2023 → Mar 2026 · range 79.5% – 86.9%
−2.5 pts
Top 10
90.9%
Jun 2023 → Mar 2026 · range 89.9% – 94.8%
−1.6 pts
HHI
4,165
Jun 2023 → Mar 2026 · range 3,125 – 4,351
Highly concentrated −186

Quarterly Activity

vs Dec 31, 2025
New
31
Increased
24
Decreased
23
Sold Out
14
Unchanged
11
Holder count: +17
Institutional value: +35.2%
Shares held: +2.1%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega GOLDMAN SACHS GROUP INC +133,545 223,489
Mega CITADEL ADVISORS LLC +121,856 341,967
Large ACADIAN ASSET MANAGEMENT LLC +97,213 204,105
Large Centiva Capital, LP +69,791 111,108
Mega AQR CAPITAL MANAGEMENT LLC +55,476 66,731

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Large Russell Investments Group, Ltd. −179,461 68,030
Mega JPMORGAN CHASE & CO −155,709 10,275
Mega MORGAN STANLEY −139,975 152,723
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC −77,678 332,313
Mega BARCLAYS PLC −32,483 5,581

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD CAPITAL MANAGEMENT LLC 819,120 $2,006,844
Small Peapod Lane Capital LLC 599,805 $1,469,522
Mega VANGUARD FIDUCIARY TRUST CO 170,131 $416,820
Large LOS ANGELES CAPITAL MANAGEMENT LLC 163,259 $399,984
Large Boston Partners 154,388 $378,250

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 1,022,411 $1,891,458
Large Corient Private Wealth LLC 97,902 $181,118
Mid LANDSCAPE CAPITAL MANAGEMENT, L.L.C. 72,619 $134,343
Mega FRANKLIN RESOURCES INC 72,088 $133,362
Mid Quadrature Capital Ltd 65,875 $121,868
Filter: New 31 Increased 24 Reduced 23 Sold out 14 Unchanged 11
Showing 91 of 91
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Small WEXFORD CAPITAL LP $54,067,119 62.90% 22,068,212
Large ADAGE CAPITAL PARTNERS GP, L.L.C. $11,208,750 13.04% 4,575,000
Mega BlackRock, Inc. $3,564,353 4.15% 1,454,839
Mega VANGUARD CAPITAL MANAGEMENT LLC $2,006,844 2.33% 819,120
Mega DIMENSIONAL FUND ADVISORS LP $1,681,186 1.96% 686,199
Mega GEODE CAPITAL MANAGEMENT, LLC $1,496,768 1.74% 610,926
Small Peapod Lane Capital LLC $1,469,522 1.71% 599,805
Mega STATE STREET CORP $1,033,708 1.20% 421,922
Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC $814,166 0.95% 332,313
Mega CITADEL ADVISORS LLC $811,849 0.94% 331,367
Large Empowered Funds, LLC $591,216 0.69% 241,313
Large RENAISSANCE TECHNOLOGIES LLC $568,331 0.66% 231,972
Mega GOLDMAN SACHS GROUP INC $547,546 0.64% 223,489
Large ACADIAN ASSET MANAGEMENT LLC $500,057 0.58% 204,105
Mega NORTHERN TRUST CORP Bank $458,461 0.53% 187,128
Mega VANGUARD FIDUCIARY TRUST CO Bank $416,820 0.48% 170,131
Large LOS ANGELES CAPITAL MANAGEMENT LLC $399,984 0.47% 163,259
Large Boston Partners $378,250 0.44% 154,388
Mega MORGAN STANLEY $374,169 0.44% 152,723
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $343,355 0.40% 140,145
Mega Bank of New York Mellon Corp Bank $324,720 0.38% 132,539
Large Centiva Capital, LP $272,214 0.32% 111,108
Large STIFEL FINANCIAL CORP $258,651 0.30% 105,572
Large OSAIC HOLDINGS, INC. $177,426 0.21% 72,419
Mega WELLINGTON MANAGEMENT GROUP LLP $167,616 0.19% 68,415
Large Russell Investments Group, Ltd. $166,673 0.19% 68,030
Mega AQR CAPITAL MANAGEMENT LLC $163,489 0.19% 66,731
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $144,209 0.17% 58,861
Large Squarepoint Ops LLC $126,469 0.15% 51,620
Mega Nuveen, LLC $90,264 0.11% 36,843
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $88,932 0.10% 36,299
Mega RHUMBLINE ADVISERS $80,514 0.09% 32,863
Mid OCCUDO QUANTITATIVE STRATEGIES LP $71,873 0.08% 29,336
Large Mariner, LLC $65,838 0.08% 26,873
Mega BANK OF AMERICA CORP /DE/ Bank $62,693 0.07% 25,589
Mid LEVIN CAPITAL STRATEGIES, L.P. $61,250 0.07% 25,000
Mega JANE STREET GROUP, LLC $55,991 0.07% 22,854
Micro Verdad Advisers, LP $55,686 0.06% 22,729
Small STEINBERGANNA WEALTH MANAGEMENT $44,982 0.05% 18,360
Large Schonfeld Strategic Advisors LLC $44,896 0.05% 18,325
Large Creative Planning $41,527 0.05% 16,950
Mega BNP PARIBAS ARBITRAGE, SA $41,030 0.05% 16,747
Mid Sanctuary Advisors, LLC $40,856 0.05% 16,676
Large Connor, Clark & Lunn Investment Management Ltd. $35,549 0.04% 14,510
Mid GSA CAPITAL PARTNERS LLP $34,077 0.04% 13,909
Large SEI INVESTMENTS CO $33,268 0.04% 13,579
Mega PRICE T ROWE ASSOCIATES INC /MD/ $32,793 0.04% 13,385
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $30,796 0.04% 12,570
Mid Tower Research Capital LLC (TRC) $30,678 0.04% 12,522
Mega FMR LLC $29,747 0.03% 12,142
Mega JANE STREET GROUP, LLC $29,155 0.03% 11,900
Small Archer Investment Corp $27,440 0.03% 11,200
Mega ALLIANCEBERNSTEIN L.P. $26,827 0.03% 10,950
Small VALUEWORKS LLC $26,264 0.03% 10,720
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $26,205 0.03% 10,696
Mega CITADEL ADVISORS LLC $25,970 0.03% 10,600
Mega JPMORGAN CHASE & CO $25,173 0.03% 10,275
Large Police & Firemen's Retirement System of New Jersey Pension $23,610 0.03% 9,637
Mega WELLS FARGO & COMPANY/MN $23,199 0.03% 9,469
Mega Vanguard Global Advisers, LLC $21,496 0.03% 8,774
Mega UBS Group AG $18,783 0.02% 7,667
Large CWM, LLC $14,192 0.02% 5,793
Mega PNC FINANCIAL SERVICES GROUP, INC. $14,013 0.02% 5,720
Mega BARCLAYS PLC $13,673 0.02% 5,581
Mid SIMPLEX TRADING, LLC $13,568 0.02% 5,538
Mega Legal & General Group Plc $5,338 0.01% 2,179
Mid Ameritas Investment Partners, Inc. $4,713 0.01% 1,924
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $3,469 0.00% 1,416
Mega CITIGROUP INC $2,760 0.00% 1,127
Mid Sterling Capital Management LLC $1,967 0.00% 803
Mid Allianz SE $1,960 0.00% 800
Mid Advisory Services Network, LLC $1,225 0.00% 500
Mid Allworth Financial LP $494 0.00% 202
Mid Optiver Holding B.V. $490 0.00% 200
Small Westside Investment Management, Inc. $458 0.00% 187
Mid MAI Capital Management $411 0.00% 168
Mid ROTHSCHILD INVESTMENT LLC $325 0.00% 133
Mid SBI Securities Co., Ltd. Broker-Dealer $247 0.00% 101
Mid EverSource Wealth Advisors, LLC $204 0.00% 84
Small Root Financial Partners, LLC $78 0.00% 32
Small Transamerica Financial Advisors, LLC $75 0.00% 31
Micro True Wealth Design, LLC $61 0.00% 25
Small Essential Partners LLC $49 0.00% 20
Small SJS Investment Consulting Inc. $41 0.00% 17
Mid Arax Advisory Partners $41 0.00% 17
Micro Wealth Preservation Advisors, LLC $36 0.00% 15
Mid Farther Finance Advisors, LLC $34 0.00% 14
Small JPL Wealth Management, LLC $22 0.00% 9
Mid IFP Advisors, Inc $12 0.00% 5
Small Caitong International Asset Management Co., Ltd $4 0.00% 2
Mega ROYAL BANK OF CANADA Bank $2 0.00% 1

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