SCHEDULE: Winemaster Reduces PSI Stake to 6.3%

Gary S. Winemaster has significantly reduced his beneficial ownership in Power Solutions International, Inc. to 6.3% through a series of open market sales.

Summary

• Gary S. Winemaster, the reporting person, now beneficially owns 1,455,259 shares of Power Solutions International, Inc. Common Stock.
• This represents 6.3% of the Common Stock outstanding, based on 23,029,846 shares outstanding as of July 31, 2025, as disclosed in the Issuer's Quarterly Report on Form 10-Q.
• Since the most recent Schedule 13D filing, Winemaster sold a total of 475,404 shares in open market transactions on the Nasdaq stock market.
• Sales occurred on August 7, 2025 (2,594 shares at a weighted average price of $91.683 per share), August 8, 2025 (203,938 shares at $107.7395 per share), August 11, 2025 (12,605 shares at $104.2741 per share), September 18, 2025 (112,915 shares at $105.8548 per share), and September 19, 2025 (143,352 shares at $109.4043 per share).

Sentiment

Score: 4

Explanation: The sentiment is neutral to slightly negative. While the reporting person sold shares at increasing prices (positive for the seller), the substantial reduction in a significant individual's stake could be perceived as a negative signal for the company's stock by investors.

Positives

• The reporting person executed sales at generally increasing weighted average prices, indicating favorable market conditions for the seller during the divestment period.

Negatives

• The significant reduction in beneficial ownership by a key individual could be interpreted by the market as a lack of long-term conviction or a need for personal liquidity, potentially impacting investor sentiment negatively.

Risks

• No explicit risks related to the company's operations or financial health are mentioned in this beneficial ownership filing.

Future Outlook

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Industry Context

This filing reflects a significant insider's divestment, which can sometimes influence market perception of a company, irrespective of broader industry trends. However, the filing itself does not provide specific industry-wide context.

Stakeholder Impact

• Shareholders may interpret the significant reduction in a major individual's stake as a potential signal regarding the company's future prospects or the individual's confidence, which could influence trading decisions and market sentiment.

Key Dates

Recommendation

The significant reduction in beneficial ownership by a key individual, Gary S. Winemaster, through open market sales, while executed at generally increasing prices, could signal a shift in confidence or a need for liquidity. This warrants a 'hold' recommendation as investors should monitor for further developments or explanations regarding this substantial divestment, rather than making a definitive buy or sell decision based solely on this ownership change.

Keywords

Power Solutions International, PSI, Gary S. Winemaster, Schedule 13D, Beneficial Ownership, Stock Sales, Insider Selling, Common Stock