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

Rhea-AI Filing Summary

Weichai America Corp., together with Weichai Power Co., Ltd. and Shandong Heavy Industry Group Co., Ltd., reported multiple open-market sales of Power Solutions International, Inc. (PSIX) common stock on 08/22/2025 under Rule 144. The filing lists 11 separate sales ranging individually from 1,665 to 19,228 shares at weighted average prices between approximately $81.19 and $91.768. The aggregate number of shares reported sold in these lines is 87,210. After these transactions the Reporting Persons beneficially own 10,861,625 shares, held indirectly through Weichai America Corp., with shared voting and disposition power among the Reporting Persons.

Positive

• None.

Negative

• Large open-market dispositions: Reporting Persons sold a total of 87,210 shares of PSIX on 08/22/2025.
• Decreasing indirect stake disclosure: After the sales, the Reporting Persons report beneficial ownership of 10,861,625 shares, indicating a sizeable but reduced indirect position.

Insights

Financial Analyst

TL;DR: Significant open-market dispositions totaling 87,210 shares by related reporting entities, leaving them with 10,861,625 shares.

The Form 4 documents coordinated broker-dealer sales on 08/22/2025 executed pursuant to Rule 144. Eleven separate sale lines show weighted-average prices rising from about $81.57 to $91.20, with underlying per-line price ranges disclosed in footnotes. The filing confirms indirect ownership through Weichai America Corp. and shared control among the three Reporting Persons. This is a factual disclosure of disposition activity; no derivative transactions or acquisitions are reported.

Corporate Governance Expert

TL;DR: Joint filing shows shared voting/disposition power and multiple Rule 144 sales; beneficial ownership remains material at over 10.8 million shares.

The report is jointly filed by three affiliated entities and includes explanatory footnotes providing price ranges for each weighted-average sale price. It states that Weichai America Corp. is the direct owner and that no individual has beneficial ownership of these shares. Exhibits reference previously filed powers of attorney. The filing is procedural and documents compliance with Section 16 reporting requirements for insider transactions.

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

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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)
08/22/2025

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	08/22/2025		S(1)		3,308	D	$81.5738(2)	10,945,527	I	See Explanation of Responses(13)
Common Stock	08/22/2025		S(1)		3,720	D	$82.4472(3)	10,941,807	I	See Explanation of Responses(13)
Common Stock	08/22/2025		S(1)		3,921	D	$83.596(4)	10,937,886	I	See Explanation of Responses(13)
Common Stock	08/22/2025		S(1)		1,665	D	$84.7368(5)	10,936,221	I	See Explanation of Responses(13)
Common Stock	08/22/2025		S(1)		4,521	D	$85.3955(6)	10,931,700	I	See Explanation of Responses(13)
Common Stock	08/22/2025		S(1)		3,979	D	$86.3401(7)	10,927,721	I	See Explanation of Responses(13)
Common Stock	08/22/2025		S(1)		12,294	D	$87.5674(8)	10,915,427	I	See Explanation of Responses(13)
Common Stock	08/22/2025		S(1)		9,988	D	$88.4558(9)	10,905,439	I	See Explanation of Responses(13)
Common Stock	08/22/2025		S(1)		11,263	D	$89.5211(10)	10,894,176	I	See Explanation of Responses(13)
Common Stock	08/22/2025		S(1)		19,228	D	$90.5185(11)	10,874,948	I	See Explanation of Responses(13)
Common Stock	08/22/2025		S(1)		13,323	D	$91.2035(12)	10,861,625	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 $81.19 to $81.945, 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 $82.005 to $82.92, 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.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.01 to $83.9734, 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.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $84.06 to $84.9999, 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.

6. 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 $85.97, 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.

7. 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 $86.9972, 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.

8. 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 $87.9999, 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.

9. 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 $88.9942, 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.

10. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $89.0055 to $89.9985, 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.

11. 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 $90.9996, 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.

12. 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 $91.768, 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.

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.	08/26/2025
	/s/ Chenglong Sun, Authorized Representative, Weichai Power Co., Ltd.	08/26/2025
	/s/ Chenglong Sun, Authorized Representative, Shandong Heavy Industry Group Co., Ltd.	08/26/2025
	** 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).
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FAQ

What transactions did Weichai entities report on the PSIX Form 4?

They reported 11 open-market sales of PSIX common stock on 08/22/2025 executed pursuant to Rule 144, with a total of 87,210 shares sold.

How many PSIX shares do the Reporting Persons own after these transactions?

The Form 4 states the Reporting Persons beneficially own 10,861,625 shares following the reported sales.

At what prices were the PSIX shares sold?

Weighted-average prices per line are reported between approximately $81.5738 and $91.2035, with disclosed per-line ranges in the footnotes.

Who filed the Form 4 for these PSIX transactions?

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

Were any derivative securities reported in the filing?

No derivative securities (options, warrants, convertible securities) are reported in Table II of this Form 4.