Power Solutions 13D/A: Gary Winemaster Reports 6.3% Stake After Sales

Rhea-AI Filing Summary

Gary S. Winemaster amended his Schedule 13D for Power Solutions International, Inc. (PSIX) to report beneficial ownership of 1,455,259 shares, representing 6.3% of the outstanding common stock based on 23,029,846 shares outstanding as of July 31, 2025. The amendment restates voting and dispositive power: sole voting and dispositive power over 1,454,578 shares and shared power over 681 shares. The filing lists a series of open-market sales since the prior filing: 2,594, 203,938, 12,605, 112,915, and 143,352 shares on August 7, August 8, August 11, September 18, and September 19, 2025, respectively, totaling 475,404 shares sold. The statement contains no disclosure of legal proceedings and identifies source of funds as "OO."

Positive

• Amendment provides clear, detailed disclosure of current beneficial ownership, voting and dispositive power
• Specific trade dates and weighted average prices are reported, enhancing transparency

Negative

• Open-market sales totaling 475,404 shares were reported across August and September 2025, representing material disposals

Insights

Financial Analyst

TL;DR: Reporting person sold a material block of shares yet remains a >6% holder, signaling significant liquidity activity but continued meaningful stake.

The amendment clarifies current beneficial ownership and voting/dispositive power precisely, important for ownership metrics and potential activist influence. The open-market sales listed total 475,404 shares executed across August and September 2025 at weighted average prices disclosed per trade. While the filer still holds 1,455,259 shares (6.3%), the sales reduce free-float and may affect short-term supply dynamics. No other transactions, agreements, or legal proceedings were disclosed.

Corporate Governance Expert

TL;DR: Amendment is a routine, compliance-focused disclosure that maintains transparency about a substantial shareholder's position and recent disposals.

The filing meets Schedule 13D obligations by restating Item 5 and listing specific trade dates, share amounts, and weighted average prices. Reporting of sole versus shared voting/dispositive power is precise, preserving clarity on control rights. Absence of additional arrangements or legal disclosures suggests no change in intent to influence governance beyond holding a significant stake, though the pattern of sizable open-market sales is noteworthy for board and investor relations teams.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 22)

POWER SOLUTIONS INTERNATIONAL, INC.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

73933G202

(CUSIP Number)

Gary S. Winemaster
2140 Kingfish Road,
Naples, FL, 34102
(630) 350-9400

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

09/18/2025

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

CUSIP No. 73933G202

1

Name of reporting person

Gary S. Winemaster

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 1,454,578.00
8	Shared Voting Power 681.00
9	Sole Dispositive Power 1,454,578.00
10	Shared Dispositive Power 681.00

11

Aggregate amount beneficially owned by each reporting person

1,455,259.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

6.3 %

14

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Common Stock
(b)	Name of Issuer: POWER SOLUTIONS INTERNATIONAL, INC.
(c)	Address of Issuer's Principal Executive Offices: 201 Mittel Drive, Wood Dale, ILLINOIS , 60191.
Item 5.	Interest in Securities of the Issuer
(a)	Item 5(a) of this Schedule 13D is hereby amended and restated in its entirety as follows: The information contained on the cover pages is incorporated herein by reference. The Reporting Person may be deemed to beneficially own 1,455,259 shares of Common Stock, representing 6.3% of the Common Stock outstanding based upon 23,029,846 shares of the Issuer's Common Stock outstanding as of July 31, 2025, as disclosed in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on August 8, 2025.
(b)	Item 5(b) of this Schedule 13D is hereby amended and restated in its entirety as follows: Number of shares the Reporting Person has: Sole power to vote or direct the vote: 1,454,578 Shared power to vote: 681 Sole power to dispose or direct the disposition of: 1,454,578 Shared power to dispose or direct the disposition of: 681
(c)	Since the most recent filing on Schedule 13D, the Reporting Person has not engaged in any transactions in the Issuer's Common Stock other than the following, each of which involved a series of open market transactions on the Nasdaq stock market: -- On August 7, 2025, the Reporting Person sold 2,594 shares of Common Stock at a weighted average price of $91.683 per share. -- On August 8, 2025, the Reporting Person sold 203,938 shares of Common Stock at a weighted average price of $107.7395 per share. -- On August 11, 2025, the Reporting Person sold 12,605 shares of Common Stock at a weighted average price of $104.2741 per share. -- On September 18, 2025, the Reporting Person sold 112,915 shares of Common Stock at a weighted average price of $105.8548 per share. -- On September 19, 2025, the Reporting Person sold 143,352 shares of Common Stock at a weighted average price of $109.4043 per share.
(d)	None.
(e)	Not applicable.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Gary S. Winemaster

Signature:	/s/ Gary S. Winemaster
Name/Title:	Gary S. Winemaster
Date:	09/22/2025

FAQ

What stake does Gary S. Winemaster hold in PSIX after this filing?

The filing reports beneficial ownership of 1,455,259 shares, representing 6.3% of PSIX based on 23,029,846 shares outstanding as of July 31, 2025.

How many PSIX shares did Winemaster sell recently and on what dates?

The filing lists open-market sales of 2,594 on August 7, 203,938 on August 8, 12,605 on August 11, 112,915 on September 18, and 143,352 on September 19, 2025, totaling 475,404 shares.

Does the filing disclose any legal proceedings involving the reporting person?

No. The filing indicates no disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e).

What voting and dispositive powers does Winemaster have over PSIX shares?

The report states sole voting power and sole dispositive power over 1,454,578 shares and shared voting and dispositive power over 681 shares.

What source of funds is listed for the reported transactions?

The filing lists the source of funds as "OO".