Power Solutions International
PSIX
204 hedge funds and large institutions have $533M invested in Power Solutions International in 2025 Q3 according to their latest regulatory filings, with 92 funds opening new positions, 65 increasing their positions, 32 reducing their positions, and 13 closing their positions.
608% more first-time investments, than exits
New positions opened: 92 | Existing positions closed: 13
258% more capital inflows, than outflows
Capital inflows: $251M | Capital outflows: $70.1M
103% more repeat investments, than reductions
Existing positions increased: 65 | Existing positions reduced: 32
62% more funds holding
Funds holding: 126 → 204 (+78)
10% more call options, than puts
Call options by funds: $21.3M | Put options by funds: $19.3M
8.5% more ownership
Funds ownership: 15.17% → 23.68% (+8.5%)
0% more funds holding in top 10
Funds holding in top 10: 2 → 2 (0)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Arrowstreet Capital
Boston,
Massachusetts
|
+$22.3M |
| 2 |
Busey Bank
Urbana,
Illinois
|
+$19.5M |
| 3 |
Allspring Global Investments
Charlotte,
North Carolina
|
+$18.3M |
| 4 |
Portolan Capital Management
Boston,
Massachusetts
|
+$17.4M |
| 5 |
Morgan Stanley
New York
|
+$13M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Gagnon Securities
New York
|
-$24.5M |
| 2 |
GA
Gagnon Advisors
New York
|
-$11.7M |
| 3 |
Wells Fargo
San Francisco,
California
|
-$6.2M |
| 4 |
Two Sigma Investments
New York
|
-$5.08M |
| 5 |
SST
S Squared Technology
New York
|
-$2.56M |
PSIX Hedge Fund Activity: Q3 2025 in Review
204 of the 7,652 institutional investors tracked by Wall St. Rank reported a position in Power Solutions International (PSIX) for Q3 2025, worth a combined $533M — up 136% from $226M a quarter earlier.
Buyers outnumbered sellers: 92 funds opened new PSIX positions and 13 closed out — a net gain of 79 holders — while 65 added to existing stakes and 32 trimmed.
The largest buyer was Arrowstreet Capital, adding an estimated $22.3M. The largest seller was Gagnon Securities, cutting an estimated $24.5M.
- 204 institutional investors held Power Solutions International (PSIX) as of Q3 2025, up from 126 in Q2 2025.
- Funds reported $533M of Power Solutions International stock for Q3 2025, up 136% quarter-over-quarter.
- 92 funds opened new Power Solutions International positions in Q3 2025 and 13 closed out, a net change of +79 holders.
- The largest Power Solutions International buyer in Q3 2025 was Arrowstreet Capital, an estimated $22.3M added.
- The largest Power Solutions International seller in Q3 2025 was Gagnon Securities, an estimated $24.5M sold.
Based on aggregated 13F filings for Q3 2025.