Mammoth Energy Services Inc

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Mammoth Energy Services Inc
TickerTUSK
CIK #0001679268
CUSIP56155L108
SectorEnergy & Transportation - Oil & Gas Field Services, Nec
Address4727 Gaillardia Parkway Suite 200, Oklahoma City, OK 73142
Source [EDGAR]
CIK Filing 2011 - 2025
[0001679268] 10-K
[0001679268] 10-Q
[0001679268] 3
[0001679268] 4
[0001679268] 5
[0001679268] 8-K
[0001679268] SC 13D
[0001679268] SC 13G
Form 13D/13G Filer Form 13D/13G Subject Filed % Owned
Valueworks LLC Mammoth Energy Services Inc [2023-02-10] 5.1
Adage Capital Partners GP LLC Mammoth Energy Services Inc [2022-04-21] 6.11
GPOR Distribution Trust Mammoth Energy Services Inc [2021-07-12] 21.1
Gulfport Energy Corp Mammoth Energy Services Inc [2018-02-14] 25.1
Janus Henderson Group PLC Mammoth Energy Services Inc [2018-02-13] 5.7
Gulfport Energy Corp Mammoth Energy Services Inc [2017-02-14] 24.2
Janus Capital Management LLC Mammoth Energy Services Inc [2017-02-13] 6.9
Wexford Capital LP Mammoth Energy Services Inc [2017-02-08] 54.52
Form 3/4/5 Filer 2011 - 2025
Smith Arthur L
Mammoth Energy Services Inc
Amron Arthur H
Booker Corey J.
Palm James D
Jacobi Paul M.
Wexford Capital LP
Jacobs Joseph
Wexford GP LLC
Davidson Charles E
Straehla Arty
Layton Mark E.
GPOR Distribution Trust
Ross Matthew
Wexford Spectrum Trading LTD
Wexford Catalyst Trading LTD
MEH Sub LLC
Yellen Jonathan H
Heerwagen Paul K IV
McCarthy Marc T
LaForge Rusty Neal
Gulfport Energy Corp
Weiss Andre
Mammoth Energy Holdings LLC
Gaydosik Aaron
Form 13F Holdings
Firm Period DFND Voting Shares
Wexford Capital LP [2025-06-30] SOLE 22,096,068 22,096,068
Adage Capital Partners GP LLC [2025-06-30] SOLE 4,575,000 4,575,000
Valueworks LLC [2025-06-30] SOLE 2,389,031 2,389,031
BlackRock, Inc. [2025-06-30] SOLE 1,395,346 1,469,099
Dimensional Fund Advisors LP [2025-06-30] SOLE 913,539 949,110
Vanguard Group Inc [2025-06-30] SOLE 0 938,373
Geode Capital Management LLC [2025-06-30] DFND 580,659 580,659
State Street Corp [2025-06-30] DFND 374,263 408,763
Bridgeway Capital Management LLC [2025-06-30] SOLE 350,454 350,454
Northern Trust Corp [2025-06-30] DFND 190,140 190,140
JPMorgan Chase & Co [2025-06-30] DFND 151,741 185,761
Morgan Stanley [2025-06-30] DFND 174,283 185,260
Empowered Funds LLC [2025-06-30] OTR 174,454 174,454
Castleknight Management LP [2025-06-30] SOLE 167,433 167,433
Citadel Advisors LLC [2025-06-30] DFND 159,682 159,682
Susquehanna International Group LLP [2025-06-30] OTR 122,552 139,752
Renaissance Technologies LLC [2025-06-30] SOLE 132,172 132,172
Bank of New York Mellon Corp [2025-06-30] DFND 123,969 132,145
Wellington Management Group LLP [2025-06-30] DFND 0 115,212
Stifel Financial Corp [2025-06-30] DFND 105,572 105,869
Royal Bank of Canada [2025-06-30] DFND 85,457 85,457
Charles Schwab Investment Management Inc [2025-06-30] SOLE 70,674 70,674
Osaic Holdings Inc [2025-06-30] DFND 0 59,550
Marshall Wace LLP [2025-06-30] OTR 0 57,436
Goldman Sachs Group Inc [2025-06-30] DFND 53,601 53,601
Dimensional Fund Advisors LP [2025-06-30] DFND 0 44,804
Price T Rowe Associates Inc /MD/ [2025-06-30] DFND 43,285 43,285
Barclays PLC [2025-06-30] SOLE 41,548 41,548
Royce & Associates LP [2025-06-30] SOLE 41,154 41,154
Nuveen, LLC [2025-06-30] DFND 36,843 36,843
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