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

Rhea-AI Filing Summary

Power Solutions International insiders reported coordinated sales on 08/18/2025. The report is filed jointly by Weichai America Corp., Weichai Power Co., Ltd. and Shandong Heavy Industry Group Co., Ltd. and shows a series of broker-dealer sales conducted pursuant to Rule 144. Collectively, the Reporting Persons disposed of 125,220 shares of Power Solutions International common stock in multiple transactions at weighted average prices reported in ranges from $80.00 up to $89.83. After the transactions the Reporting Persons report beneficial ownership of 11,086,621 shares (indirect). Exhibits include powers of attorney incorporated by reference.

Positive

• Transactions disclosed in accordance with SEC Form 4 requirements, including signatures and referenced powers of attorney
• Sales executed via broker-dealers pursuant to Rule 144, with explanatory footnotes detailing weighted-average price ranges

Negative

• Reporting Persons disposed of 125,220 shares on 08/18/2025 as shown on the form
• Post-transaction beneficial ownership reported as 11,086,621 shares (indirect), reflecting a reduction from pre-sale levels as shown by the per-line ownership amounts

Insights

Financial Analyst

TL;DR: Joint majority holders sold 125,220 PSIX shares via broker-dealer trades under Rule 144 on 08/18/2025, ending with 11,086,621 shares beneficially owned.

These filings document sizeable coordinated disposals executed through broker-dealers and reported as weighted-average prices in multiple ranges between $80.00 and $89.83. The sales were made pursuant to Rule 144, as the report explicitly states, and the report was filed jointly by three related Reporting Persons. The disclosure includes referenced powers of attorney. From a reporting perspective the submission supplies the required transactional detail: dates, share quantities, weighted-average price ranges and resulting post-transaction indirect beneficial ownership figures.

Corporate Governance Expert

TL;DR: Related reporting entities (Weichai affiliates) recorded multiple Rule 144 broker-dealer sales on 08/18/2025 with full Form 4 disclosure and powers of attorney referenced.

The Form 4 is joint-filed by Weichai America Corp., Weichai Power Co., Ltd. and Shandong Heavy Industry Group Co., Ltd., and it includes explanatory footnotes clarifying weighted-average price ranges for each block sold. The filing identifies the reporting relationships (direct or indirect ownership and shared voting/dispositive power) and provides signed certifications by authorized representatives. The disclosure appears procedurally complete based on the information contained in the document.

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

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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)
08/18/2025

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	08/18/2025		S(1)		16,215	D	$80.4253(2)	11,195,626	I	See Explanation of Responses(12)
Common Stock	08/18/2025		S(1)		9,586	D	$81.5656(3)	11,186,040	I	See Explanation of Responses(12)
Common Stock	08/18/2025		S(1)		14,670	D	$82.5226(4)	11,171,370	I	See Explanation of Responses(12)
Common Stock	08/18/2025		S(1)		5,376	D	$83.3502(5)	11,165,994	I	See Explanation of Responses(12)
Common Stock	08/18/2025		S(1)		7,049	D	$84.3088(6)	11,158,945	I	See Explanation of Responses(12)
Common Stock	08/18/2025		S(1)		11,406	D	$85.729(7)	11,147,539	I	See Explanation of Responses(12)
Common Stock	08/18/2025		S(1)		21,447	D	$86.53(8)	11,126,092	I	See Explanation of Responses(12)
Common Stock	08/18/2025		S(1)		21,314	D	$87.4546(9)	11,104,778	I	See Explanation of Responses(12)
Common Stock	08/18/2025		S(1)		12,303	D	$88.3211(10)	11,092,475	I	See Explanation of Responses(12)
Common Stock	08/18/2025		S(1)		5,854	D	$89.1608(11)	11,086,621	I	See Explanation of Responses(12)

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 $80.9981, 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 $81.00 to $81.985, 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.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $82.015 to $82.99, 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 $83.00 to $83.8216, 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 $84.00 to $84.91, 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 $85.00 to $85.995, 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.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $86.00 to $86.9916, 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 $87.00 to $87.9908, 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 $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.

11. 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 $89.83, 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. 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.	08/20/2025
	/s/ Chenglong Sun, Authorized Representative, Weichai Power Co., Ltd.	08/20/2025
	/s/ Chenglong Sun, Authorized Representative, Shandong Heavy Industry Group Co., Ltd.	08/20/2025
	** 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 did the Form 4 filed for PSIX report on 08/18/2025?

The Form 4 reports multiple broker-dealer sales pursuant to Rule 144 on 08/18/2025 totaling 125,220 shares, with post-transaction indirect beneficial ownership of 11,086,621 shares.

Who filed the Form 4 for PSIX?

The report is filed jointly by Weichai America Corp., Weichai Power Co., Ltd., and Shandong Heavy Industry Group Co., Ltd.

At what prices were the PSIX shares sold?

The filing reports weighted-average price ranges for each sale block, with transaction price ranges spanning from $80.00 up to $89.83.

Were the sales executed under a specific rule or procedure?

Yes. The Explanation of Responses states the transactions occurred pursuant to broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933.

Does the filing include supporting authorizations?

Yes. The Exhibit List references Exhibit 24.1 and Exhibit 24.2, powers of attorney incorporated by reference to prior Form 4 filings.