Mammoth Energy Services
TUSK
72 hedge funds and large institutions have $63.8M invested in Mammoth Energy Services in 2025 Q4 according to their latest regulatory filings, with 9 funds opening new positions, 22 increasing their positions, 26 reducing their positions, and 14 closing their positions.
0% more funds holding in top 10
Funds holding in top 10: 1 → 1 (0)
3.31% less ownership
Funds ownership: 74.83% → 71.52% (-3.3%)
6% less funds holding
Funds holding: 77 → 72 (-5)
15% less repeat investments, than reductions
Existing positions increased: 22 | Existing positions reduced: 26
23% less capital invested
Capital invested by funds: $82.6M → $63.8M (-$18.8M)
36% less first-time investments, than exits
New positions opened: 9 | Existing positions closed: 14
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Russell Investments Group
London,
United Kingdom
|
+$495K |
| 2 |
Corient Private Wealth
Miami,
Florida
|
+$395K |
| 3 |
Morgan Stanley
New York
|
+$297K |
| 4 |
Vanguard Group
Malvern,
Pennsylvania
|
+$155K |
| 5 |
Squarepoint
New York
|
+$154K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
V
ValueWorks
New York
|
-$4.09M |
| 2 |
Dimensional Fund Advisors
Austin,
Texas
|
-$478K |
| 3 |
CM
CastleKnight Management
New York
|
-$383K |
| 4 |
Royal Bank of Canada
Toronto,
Ontario, Canada
|
-$168K |
| 5 |
Deutsche Bank
Frankfurt Am Main Ge,
Germany
|
-$165K |
TUSK Hedge Fund Activity: Q4 2025 in Review
72 of the 8,228 institutional investors tracked by Wall St. Rank reported a position in Mammoth Energy Services (TUSK) for Q4 2025, worth a combined $63.8M — down 23% from $82.6M a quarter earlier.
Sellers outnumbered buyers: 14 funds closed out of TUSK and 9 opened new positions — a net loss of 5 holders — while 26 trimmed existing stakes and 22 added.
The largest buyer was Russell Investments Group, adding an estimated $495K. The largest seller was ValueWorks, cutting an estimated $4.09M.
- 72 institutional investors held Mammoth Energy Services (TUSK) as of Q4 2025, down from 77 in Q3 2025.
- Funds reported $63.8M of Mammoth Energy Services stock for Q4 2025, down 23% quarter-over-quarter.
- 9 funds opened new Mammoth Energy Services positions in Q4 2025 and 14 closed out, a net change of -5 holders.
- The largest Mammoth Energy Services buyer in Q4 2025 was Russell Investments Group, an estimated $495K added.
- The largest Mammoth Energy Services seller in Q4 2025 was ValueWorks, an estimated $4.09M sold.
Based on aggregated 13F filings for Q4 2025.