As of November 6, 2026, Power Solutions International, Inc. is a publicly traded company (Nasdaq: PSIX). The largest holder reporting an active stake on Schedule 13D is Weichai America Corp., at 46.5%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Founder or officer holdings: Gary S. Winemaster (6.3%). Passive holders reporting on Schedule 13G include Point72 (6.5%) (Schedule 13D/A, August 28, 2025).
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Is Power Solutions International, Inc. a real, registered company?
- Power Solutions International, Inc. files with the SEC under CIK 1137091 (its SEC filings).
- Its shares are listed under the ticker PSIX on Nasdaq (SEC company record).
- Incorporated in Illinois; business address in Wood Dale, Illinois, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under Power Solutions International, Inc. in our court records and SEC 8-K records (as of 2026-11-06).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Point72 (filed 2026-08-14).
Who are Power Solutions International, Inc.'s owners and officers?
Power Solutions International, Inc.: incorporated in Illinois; business address in Wood Dale, Illinois; industry Engines & Turbines (Schedule 13G/A, 2026-08-14).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-08-14 | Point72 Asset Management, L.P. | 6.5% |
| Schedule 13G, 2026-05-22 | Point72 Asset Management, L.P. | 5% |
| Schedule 13D/A, 2025-09-22 | Gary S. Winemaster | 6.3% |
| Schedule 13D/A, 2025-08-28 | Weichai America Corp. | 46.5% |
| Schedule 13D/A, 2025-08-25 | Weichai America Corp. | 47.5% |
| Schedule 13D/A, 2025-08-19 | Weichai America Corp. | 48.7% |
| Schedule 13D/A, 2025-08-15 | Weichai America Corp. | 49.8% |
| Schedule 13D/A, 2025-08-07 | Gary S. Winemaster | 8.4% |
Questions about who owns Power Solutions International, Inc.
Who owns Power Solutions International, Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of Power Solutions International, Inc.: Weichai America Corp. (46.5%, Schedule 13D/A, filed 2025-08-28), Point72 Asset Management, L.P. (6.5%, Schedule 13G/A, filed 2026-08-14) and Gary S. Winemaster (6.3%, Schedule 13D/A, filed 2025-09-22).
Who are the largest shareholders of Power Solutions International, Inc.?
By the share each holder's latest filing reports, the largest holders of Power Solutions International, Inc. on this page are Weichai America Corp. (46.5%), Point72 Asset Management, L.P. (6.5%) and Gary S. Winemaster (6.3%).
When did Weichai America Corp. buy into Power Solutions International, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Weichai America Corp. on this page is the Schedule 13D/A, filed 2025-08-15, reporting 49.8%; its latest, Schedule 13D/A filed 2025-08-28, reports 46.5%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 8 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Which insiders own Power Solutions International, Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- Shandong Heavy Industry Group Co., Ltd., a 10% owner: 10,599,759 shares (46.0% of shares outstanding), held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2025-09-15).
- Weichai America Corp., a 10% owner: 10,599,759 shares (46.0% of shares outstanding), held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2025-09-15).
- Weichai Power Co., Ltd., a 10% owner: 10,599,759 shares (46.0% of shares outstanding), held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2025-09-15).
- Gary S. Winemaster: 2,184,790 shares (9.5% of shares outstanding), 2,184,109 held directly and 681 indirectly (Form 4, 2025-04-23).
- Neil Gagnon: 972,385 shares (4.2% of shares outstanding), held indirectly through By self as Trustee of Gagnon Securities LLC Profit Sharing Plan (Form 4, 2024-10-07).
Shares outstanding: 23,065,450 as of 2026-10-29, from the company's latest SEC cover page.
How much has Power Solutions International, Inc. raised?
No fundraising or offering filing from Power Solutions International, Inc. is on file with us.
Keep reading
More on Power Solutions International, Inc. and the records around it.
Power Solutions International, Inc. elsewhere on the record
- 5%+ stake filings Aug 2026
Companies that share a holder
- Point72 Asset Management, L.P. also filed stake reports on 90 other companies: Immunocore Holdings plc (Nov 2026), Target Hospitality Corp. (Nov 2026), E.W. SCRIPPS Co (Oct 2026)
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