As of November 7, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Power Solutions International, Inc. The largest reported stake is Weichai America Corp.'s, at 46.5%. 8 filings are on record since August 7, 2025 (Schedule 13D/A, August 28, 2025).
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Key facts
- · Reporting person: Point72 Asset Management, L.P. · Sole voting: 0 · Shared voting: 1,497,155 · Sole dispositive: 0 · Shared dispositive: 1,497,155 · SCHEDULE 13G/A, 2026-08-14
- · Holder: Point72 Asset Management, L.P. · Percent: 5% · SCHEDULE 13G
- · Holder: Gary S. Winemaster · Percent: 6.3% · SCHEDULE 13D/A
- · Holder: Weichai America Corp. · Percent: 46.5% · SCHEDULE 13D/A
- · Holder: Weichai America Corp. · Percent: 47.5% · SCHEDULE 13D/A
Power Solutions International, Inc. has 8 Schedule 13D or 13G filings on record since 2025-08-07. 3 holders' latest filing reports 5% or more of common stock, par value $0.001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Weichai America Corp. | 46.5% | 10,716,152 | SCHEDULE 13D/A, 2025-08-28 | 2025-08-26 |
| Point72 Asset Management, L.P. | 6.5% | 1,497,155 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| 6.3% | 1,455,259 | SCHEDULE 13D/A, 2025-09-22 | 2025-09-18 |
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More on Power Solutions International, Inc. and the records around it.
Power Solutions International, Inc. elsewhere on the record
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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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Point72 Asset Management, L.P. | 0 | 1,497,155 | 0 | 1,497,155 | SCHEDULE 13G/A, 2026-08-14 |
| Point72 Capital Advisors, Inc. | 0 | 1,497,155 | 0 | 1,497,155 | SCHEDULE 13G/A, 2026-08-14 |
| Steven A. Cohen | 0 | 1,497,155 | 0 | 1,497,155 | SCHEDULE 13G/A, 2026-08-14 |
The latest filing identifies Power Solutions International, Inc. by CUSIP 73933G202 and gives its principal executive office as 201 MITTEL DRIVE, WOOD DALE, IL 60191 (SCHEDULE 13G/A, 2026-08-14).
Purpose of Transaction (Item 4)
Weichai America Corp.
Item 4 is hereby amended and supplemented by adding the following: On August 8, 2025, Weichai Amercia filed a notice with the SEC on Form 144 relating to the proposed sale of up to 1,150,000 shares of Common Stock in accordance with Rule 144. From August 22, 2025 to August 26, 2025, the Reporting Persons sold an aggregate of 232,683 shares of Common Stock in a series of open-market transactions through a broker-dealer.Item 4 of the SCHEDULE 13D/A filed 2025-08-28
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-07 | Gary S. Winemaster | 8.4% | SCHEDULE 13D/A |
| 2025-08-15 | Weichai America Corp. | 49.8% | SCHEDULE 13D/A |
| 2025-08-19 | Weichai America Corp. | 48.7% | SCHEDULE 13D/A |
| 2025-08-25 | Weichai America Corp. | 47.5% | SCHEDULE 13D/A |
| 2025-08-28 | Weichai America Corp. | 46.5% | SCHEDULE 13D/A |
| 2025-09-22 | Gary S. Winemaster | 6.3% | SCHEDULE 13D/A |
| 2026-05-22 | Point72 Asset Management, L.P. | 5% | SCHEDULE 13G |
| 2026-08-14 | Point72 Asset Management, L.P. | 6.5% | SCHEDULE 13G/A |
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.
Also on the record for Power Solutions International, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| November 6, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| July 27, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| May 13, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.