Power Solutions International, Inc.
PSIX- Exchange
- Nasdaq
- Industry
- Engines & Turbines
- SEC CIK
- 0001137091
No open-market purchases or sales by Power Solutions International, Inc. insiders were filed in the last 90 days; 157 institutions reported holding it in 13F filings for Q2 2026, worth $328.5M in total; no superinvestor holds it.
Holders of 5% or more of PSIX
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Power Solutions International, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Weichai America Corp. | 13D/A | 46.50%10.7M shares | −1.00 ppfrom 47.50% | Aug 15, 20254 filings | Aug 28, 2025 | SEC |
| Gagnon Securities LLC | 13G/A | 7.30%1.68M shares | 0.00 ppfrom 7.30% | Jan 23, 20252 filings | Jan 23, 2025 | SEC |
| Point72 Asset Management, L.P. | 13G/A | 6.50%1.50M shares | +1.50 ppfrom 5.00% | May 22, 20262 filings | Aug 14, 2026 | SEC |
| Winemaster Gary S | 13D/A | 6.30%1.46M shares | −2.10 ppfrom 8.40% | Aug 7, 20234 filings | Sep 22, 2025 | SEC |
| Gagnon Neil | 13G/A | 5.00%1.14M shares | – | Feb 9, 20216 filings | Feb 14, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
18 Schedule 13D and 13G filings on Power Solutions International, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 14, 20264:09 PM ET | Point72 Asset Management, L.P.and 2 others | 13G/A | 6.50%1.50M shares | +1.50 ppfrom 5.00% | Jun 30, 2026 | SEC |
| May 22, 20264:08 PM ET | Point72 Asset Management, L.P.and 2 others | 13G | 5.00%1.16M shares | New | May 21, 2026 | SEC |
| Sep 22, 20254:24 PM ET | Winemaster Gary S | 13D/A | 6.30%1.46M shares | −2.10 ppfrom 8.40% | Sep 18, 2025 | SEC |
| Aug 28, 20254:00 PM ET | Weichai America Corp.and 2 others | 13D/A | 46.50%10.7M shares | −1.00 ppfrom 47.50% | Aug 26, 2025 | SEC |
| Aug 25, 20254:01 PM ET | Weichai America Corp.and 2 others | 13D/A | 47.50%10.9M shares | −1.20 ppfrom 48.70% | Aug 21, 2025 | SEC |
| Aug 19, 20254:05 PM ET | Weichai America Corp.and 2 others | 13D/A | 48.70%11.2M shares | −1.10 ppfrom 49.80% | Aug 15, 2025 | SEC |
| Aug 15, 20254:00 PM ET | Weichai America Corp.and 2 others | 13D/A | 49.80%11.5M shares | – | Aug 13, 2025 | SEC |
| Aug 7, 20256:48 PM ET | Winemaster Gary S | 13D/A | 8.40%1.93M shares | −1.10 ppfrom 9.50% | Aug 5, 2025 | SEC |
| Apr 23, 20254:30 PM ET | Winemaster Gary S | 13D/A | 9.50%2.18M shares | – | Apr 21, 2025 | SEC |
| Feb 14, 20251:17 PM ET | Gagnon Neiland 2 others | 13G/A | 5.00%1.14M shares | – | Feb 5, 2025 | SEC |
| Jan 23, 20256:02 PM ET | Gagnon Securities LLCand 2 others | 13G/A | 7.30%1.68M shares | 0.00 ppfrom 7.30% | Dec 31, 2024 | SEC |
| Jan 23, 20256:02 PM ET | Gagnon Securities LLCand 2 others | 13G/A | 7.30%1.68M shares | – | Dec 31, 2024 | SEC |
| Feb 13, 2024 | Gagnon Neil | 13G/AOld format | – | – | – | SEC |
| Aug 7, 2023 | Winemaster Gary S | 13D/AOld format | – | – | – | SEC |
| Feb 6, 2023 | Gagnon Neil | 13G/AOld format | – | – | – | SEC |
| Feb 1, 2022 | Gagnon Neil | 13G/AOld format | – | – | – | SEC |
| Jan 12, 2022 | Gagnon Neil | 13G/AOld format | – | – | – | SEC |
| Feb 9, 2021 | Gagnon Neil | 13G/AOld format | – | – | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Power Solutions International, Inc. shares.
No Form 144 notices for Power Solutions International, Inc. are on file.