[Form 4] Power Solutions International, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Power Solutions International insiders affiliated with Weichai disclosed multiple brokered Rule 144 sales on 08/13/2025. The Reporting Persons sold a total of 162,113 shares in a series of transactions at weighted-average prices ranging approximately from $86.09 to $96.335. After these sales, the Reporting Persons collectively continue to beneficially own 11,463,824 shares on an indirect basis and retain shared voting and dispositive power. The report was filed jointly by Weichai America Corp., Weichai Power Co., Ltd. and Shandong Heavy Industry Group Co., Ltd., and includes executed powers of attorney incorporated by reference.

Positive

• Full disclosure of sales under Rule 144 with detailed price ranges and aggregate quantities
• Joint filing and signatures from authorized representatives demonstrate procedural compliance
• Reporting Persons retain a substantial indirect stake of 11,463,824 shares following the transactions

Negative

• Insiders sold 162,113 shares on a single day (08/13/2025), which could be viewed negatively by some investors despite being a small percentage of the total holding

Insights

Financial Analyst

TL;DR: Joint holders sold 162,113 PSIX shares via Rule 144; remaining indirect stake remains large at 11.46M shares, making this primarily a liquidity event.

The disclosed transactions appear to be broker-dealer sales in accordance with Rule 144, executed across multiple price points from about $86.09 to $96.34 on 08/13/2025. The cumulative sale of 162,113 shares represents roughly 1.4% of the Reporting Persons' post-sale indirect holding of 11,463,824 shares, so the absolute ownership position remains substantial. The filing is routine in form and compliant with Section 16 reporting; there is no disclosure here of derivative activity or change in governance.

Corporate Governance Expert

TL;DR: Disclosure shows compliant, jointly filed insider sales with preserved shared control; no governance changes disclosed.

The Form 4 is jointly filed by three affiliated entities and is signed by authorized representatives, with sales characterized as Rule 144 brokered transactions. The report notes shared voting and dispositive power and confirms no individual beneficial owner. From a governance perspective, the filing documents transparency and procedural compliance but does not indicate any shift in control or board composition.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Weichai America Corp.

(Last) (First) (Middle)

3100 GOLF ROAD

(Street)

ROLLING MEADOWS IL 60008

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
POWER SOLUTIONS INTERNATIONAL, INC. [ PSIX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/13/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/13/2025		S(1)		3,475	D	$86.6312(2)	11,622,462	I	See Explanation of Responses(13)
Common Stock	08/13/2025		S(1)		29,411	D	$87.6354(3)	11,593,051	I	See Explanation of Responses(13)
Common Stock	08/13/2025		S(1)		38,641	D	$88.496(4)	11,554,410	I	See Explanation of Responses(13)
Common Stock	08/13/2025		S(1)		26,396	D	$89.4827(5)	11,528,014	I	See Explanation of Responses(13)
Common Stock	08/13/2025		S(1)		21,651	D	$90.4543(6)	11,506,363	I	See Explanation of Responses(13)
Common Stock	08/13/2025		S(1)		19,852	D	$91.2786(7)	11,486,511	I	See Explanation of Responses(13)
Common Stock	08/13/2025		S(1)		6,520	D	$92.5818(8)	11,479,991	I	See Explanation of Responses(13)
Common Stock	08/13/2025		S(1)		7,287	D	$93.5515(9)	11,472,704	I	See Explanation of Responses(13)
Common Stock	08/13/2025		S(1)		1,101	D	$94.4895(10)	11,471,603	I	See Explanation of Responses(13)
Common Stock	08/13/2025		S(1)		7,582	D	$95.4208(11)	11,464,021	I	See Explanation of Responses(13)
Common Stock	08/13/2025		S(1)		197	D	$96.1979(12)	11,463,824	I	See Explanation of Responses(13)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

Weichai America Corp.

(Last) (First) (Middle)

3100 GOLF ROAD

(Street)

ROLLING MEADOWS IL 60008

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Weichai Power Co., Ltd.

(Last) (First) (Middle)

SECTION A 197, FU SHOU EAST STREET

HIGH-TECH INDUSTRIAL DEV. ZONE

(Street)

WEIFANG, SHANDONG PROVINCE F4 261061

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Shandong Heavy Industry Group Co., Ltd.

(Last) (First) (Middle)

#40-1 YANZI SHAN WEST ROAD

(Street)

JINAN, SHANDONG PROVINCE F4 250014

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. These transactions occurred pursuant to broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933, as amended.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $86.09 to $86.99, inclusive. The Reporting Persons (as defined below) undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $87.00 to $87.9975, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $88.00 to $88.99, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $89.00 to $89.99, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $90.00 to $90.95, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote.

7. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.00 to $91.94, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $92.27 to $92.995, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote.

9. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $93.14 to $93.955, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $94.03 to $94.985, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $95.00 to $95.99, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote.

12. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $96.065 to $96.335, inclusive. The Reporting Persons undertake to provide the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the range set forth in this footnote.

13. This report is filed jointly by Weichai America Corp., Weichai Power Co., Ltd. and Shandong Heavy Industry Group Co., Ltd. (collectively, the "Reporting Persons"). Weichai America Corp. is the direct owner of the Common Stock referenced in this report and shares the power to vote and the power to dispose of all of such shares of Common Stock with the other Reporting Persons. No individual has beneficial ownership over the Common Stock beneficially owned by the Reporting Persons.

Remarks:

Exhibit List: Exhibit 24.1 - Power of Attorney (Weichai Power Co., Ltd.), incorporated by reference to Exhibit 24.1 to the Form 4 filed by Reporting Persons with the Securities and Exchange Commission on August 14, 2025 Exhibit 24.2 - Power of Attorney (Shandong Heavy Industry Group Co., Ltd.), incorporated by reference to Exhibit 24.2 to the Form 4 filed by Reporting Persons with the Securities and Exchange Commission on August 14, 2025

	/s/ Jinguang Liu (aka Jin Liu), Chief Financial Officer, Weichai America Corp.	08/15/2025
	/s/ Chenglong Sun, Authorized Representative, Weichai Power Co., Ltd.	08/15/2025
	/s/ Chenglong Sun, Authorized Representative, Shandong Heavy Industry Group Co., Ltd.	08/15/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What insider transactions were reported for PSIX on 08/13/2025?

The Reporting Persons executed multiple broker-dealer sales under Rule 144 totaling 162,113 shares on 08/13/2025 at weighted-average prices ranging roughly from $86.09 to $96.335.

Who filed the Form 4 for PSIX and what is their relationship to the company?

The Form 4 was filed jointly by Weichai America Corp., Weichai Power Co., Ltd. and Shandong Heavy Industry Group Co., Ltd. Each is identified as a Director and a 10% owner of the issuer's common stock.

How many PSIX shares do the Reporting Persons own after the disclosed sales?

After the reported transactions, the Reporting Persons collectively beneficially own 11,463,824 shares on an indirect basis.

Were the sales executed pursuant to a 10b5-1 plan or Rule 144?

The filing states the transactions were broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933.

Does the Form 4 disclose any derivative holdings or option exercises?

No. Table II for derivative securities contains no reported transactions or holdings; only non-derivative common stock sales are disclosed.