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

Rhea-AI Filing Summary

Power Solutions International insiders sold a small portion of shares on August 20, 2025. The filing shows the Reporting Persons—Weichai America Corp., Weichai Power Co., Ltd., and Shandong Heavy Industry Group Co., Ltd.—sold 15,797 shares at a weighted-average price of $80.4969 and 5 additional shares at $81.00, executed through broker-dealer Rule 144 transactions. After these sales the Reporting Persons report beneficial ownership of 10,991,154 and 10,991,149 shares (reported as indirect ownership). The report was filed jointly and includes powers of attorney references.

Positive

• Timely and complete disclosure of insider sales with signatures and referenced powers of attorney
• Sales conducted under Rule 144, indicating compliance with transfer restrictions and broker-dealer execution

Negative

• Reduction in beneficial ownership of 15,802 shares reported, though materiality relative to total outstanding shares is not provided
• Filing does not disclose percentage ownership or motives for the sales, limiting interpretation of significance

Insights

Financial Analyst

TL;DR: Joint insiders completed Rule 144 sales of ~15.8k shares, a routine liquidity event with limited disclosed market impact.

The Form 4 discloses broker-dealer sales executed under Rule 144 on 08/20/2025. The sizes reported (15,797 and 5 shares) and the use of a weighted-average price indicate multiple transactions rather than a single block sale. The filing provides exact post-transaction beneficial ownership counts but does not disclose total outstanding shares or percentage ownership, so market impact cannot be quantified from this form alone. Disclosure and joint filing are procedurally appropriate.

Corporate Governance Expert

TL;DR: The joint filing and signatures show proper disclosure governance; transactions are documented with required explanations.

The report is signed by authorized representatives and cites Exhibits 24.1 and 24.2 for powers of attorney, demonstrating formal authority to file. The Explanation of Responses states the sales were conducted pursuant to Rule 144 and clarifies voting/disposal arrangements among the Reporting Persons. The disclosure meets Form 4 requirements but does not provide context on motives or any change in control.

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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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)
08/20/2025

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	08/20/2025		S(1)		15,797	D	$80.4969(2)	10,991,154	I	See Explanation of Responses(3)
Common Stock	08/20/2025		S(1)		5	D	$81	10,991,149	I	See Explanation of Responses(3)

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 $80.00 to $80.99, 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. 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.	08/22/2025
	/s/ Chenglong Sun, Authorized Representative, Weichai Power Co., Ltd.	08/22/2025
	/s/ Chenglong Sun, Authorized Representative, Shandong Heavy Industry Group Co., Ltd.	08/22/2025
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transactions were reported for PSIX on the Form 4?

The Reporting Persons sold 15,797 shares at a weighted-average $80.4969 and 5 shares at $81.00 on 08/20/2025 via broker-dealer Rule 144 transactions.

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

The Form 4 was jointly filed by Weichai America Corp., Weichai Power Co., Ltd., and Shandong Heavy Industry Group Co., Ltd. Each is reported as a director and 10% owner; Weichai America Corp. is the direct owner of the shares referenced.

How many shares did the Reporting Persons own after the reported transactions?

After the sales the Reporting Persons reported beneficial ownership of 10,991,154 and 10,991,149 shares (reported as indirect ownership).

Were the sales executed under a specific rule or plan?

Yes. The Explanation states the transactions were executed pursuant to broker-dealer sales under Rule 144 of the Securities Act of 1933.

Does the Form 4 explain why the insiders sold shares?

No. The filing states the sales were Rule 144 broker-dealer transactions but does not disclose the reason or motive for the sales.