Power Solutions International, Inc
Ownership
Ownership Structure
Who owns Power Solutions International, Inc (PSIX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 30.4% of the shares are freely tradable; institutional investors hold 30.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 3.10 | 715,556 | +6.2 | 03/31/2026 |
| Arrowstreet Capital Limited Partnership | 2.02 | 466,204 | +5.2 | 03/31/2026 |
| Situational Awareness Partners LP | 1.87 | 432,300 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 1.48 | 340,974 | +0.0 | 03/31/2026 |
| Yunqi Capital Ltd | 1.47 | 339,000 | +0.0 | 06/30/2026 |
| Dimensional Fund Advisors, Inc. | 1.29 | 296,812 | +4.8 | 06/30/2026 |
| OCEANLINK MANAGEMENT LTD. | 1.23 | 283,940 | +0.0 | 06/30/2026 |
| Barclays PLC | 1.04 | 239,046 | +789.5 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 1.11 | 256,749 | +0.0 | 07/31/2026 |
| iShares Russell 2000 ETF | 0.97 | 223,962 | -0.6 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.