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Mammoth Energy Services
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Overview Fund Activity

64 hedge funds and large institutions have $102M invested in Mammoth Energy Services in 2025 Q2 according to their latest regulatory filings, with 5 funds opening new positions, 30 increasing their positions, 16 reducing their positions, and 5 closing their positions.

Holders
64
Holders Change
-1
Holders Change %
-1.54%
% of All Funds
0.86%
Holding in Top 10
1
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.01%
New
5
Increased
30
Reduced
16
Closed
5
Calls
$45K
Puts
$151K
Net Calls
-$106K
Net Calls Change
-$67K

Top Buyers

1
Adage Capital Partners
1
Adage Capital Partners
Massachusetts
$12.8M
2
JPMorgan Chase & Co
2
JPMorgan Chase & Co
New York
$520K
3
Morgan Stanley
3
Morgan Stanley
New York
$519K
4
Royal Bank of Canada
4
Royal Bank of Canada
Ontario, Canada
$244K
5
Marshall Wace
5
Marshall Wace
United Kingdom
$161K

Top Sellers

1
RA
1
Royce & Associates
New York
$115K
2
V
2
ValueWorks
New York
$6.7M
3
RC
3
Rangeley Capital
Connecticut
$0
4
Citadel Advisors
4
Citadel Advisors
Florida
$410K
5
Millennium Management
5
Millennium Management
New York
$61.2K
Name Market Value Shares Shares
Change 		Shares
Change %
WC
1
Wexford Capital
Florida
$61.9M 22,096,068 +27,856 +0.1%
Adage Capital Partners
2
Adage Capital Partners
Massachusetts
$12.8M 4,575,000 +425,000 +10%
V
3
ValueWorks
New York
$6.7M 2,389,031 -419,829 -15%
BlackRock
4
BlackRock
New York
$4.11M 1,469,099 +8,302 +0.6%
Dimensional Fund Advisors
5
Dimensional Fund Advisors
Texas
$2.78M 993,914 -7,290 -0.7%
Vanguard Group
6
Vanguard Group
Pennsylvania
$2.68M 957,241 +12,706 +1%
Geode Capital Management
7
Geode Capital Management
Massachusetts
$1.63M 580,659 +35,495 +7%
State Street
8
State Street
Massachusetts
$1.14M 408,763 +6,400 +2%
BCM
9
Bridgeway Capital Management
Texas
$981K 350,454 +14,769 +4%
Northern Trust
10
Northern Trust
Illinois
$543K 193,842 -9,185 -5%
JPMorgan Chase & Co
11
JPMorgan Chase & Co
New York
$520K 185,761 +163,291 +727%
Morgan Stanley
12
Morgan Stanley
New York
$519K 185,260 +94,026 +103%
EF
13
Empowered Funds
Pennsylvania
$488K 174,454 +14,769 +9%
CM
14
CastleKnight Management
New York
$469K 167,433 – –
Citadel Advisors
15
Citadel Advisors
Florida
$410K 146,482 -37,589 -20%
Renaissance Technologies
16
Renaissance Technologies
New York
$370K 132,172 -3,100 -2%
Bank of New York Mellon
17
Bank of New York Mellon
New York
$370K 132,145 +10,896 +9%
Wellington Management Group
18
Wellington Management Group
Massachusetts
$323K 115,212 +53,413 +86%
Stifel Financial
19
Stifel Financial
Missouri
$296K 105,869 +297 +0.3%
Royal Bank of Canada
20
Royal Bank of Canada
Ontario, Canada
$244K 87,289 +83,379 +2,132%
Charles Schwab
21
Charles Schwab
California
$198K 70,674 – –
Barclays
22
Barclays
United Kingdom
$186K 66,548 +17,027 +34%
Osaic Holdings
23
Osaic Holdings
Arizona
$179K 59,550 – –
Marshall Wace
24
Marshall Wace
United Kingdom
$161K 57,436 +57,436 New
Goldman Sachs
25
Goldman Sachs
New York
$150K 53,601 -12,987 -20%
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