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

Rhea-AI Filing Summary

Power Solutions International insider sale summary: Reporting persons Weichai America Corp., Weichai Power Co., Ltd. and Shandong Heavy Industry Group Co., Ltd. jointly reported multiple broker-dealer sales of the issuer's common stock on 08/12/2025 under Rule 144. The filings show a total of 123,822 shares disposed across multiple transactions at weighted-average prices reported line-by-line, with prices in the individual ranges disclosed in the footnotes. After these sales the Reporting Persons beneficially owned 11,625,937 shares (held indirectly). The reporting parties are identified as directors and 10% owners and the Form 4 is jointly signed by authorized representatives.

Positive

• Compliance: Transactions are reported as Rule 144 broker-dealer sales with explanatory footnotes and executed signatures, indicating regulatory compliance
• Substantial retained stake: Reporting Persons continue to beneficially own 11,625,937 shares, demonstrating a large ongoing position

Negative

• Insider dispositions: A total of 123,822 shares were sold on 08/12/2025, which may modestly increase public float
• Concentration: The sellers are directors and 10% owners; sales by large holders can be viewed negatively by some investors

Insights

Financial Analyst

TL;DR: Routine Rule 144 sales by major shareholders totaling 123,822 shares; ownership remains materially large at 11.63M shares.

These transactions are disclosed as broker-dealer sales under Rule 144 occurring on 08/12/2025 and reported on Form 4. The weighted-average prices are reported per line and the footnotes provide the price ranges for each block. Total disposals equal 123,822 shares, which reduced the Reporting Persons' holdings to 11,625,937 shares beneficially owned, held indirectly. For valuation impact, the filing provides sale prices but does not state proceeds or pre-sale holdings, so direct impact on free float or liquidity cannot be precisely quantified from this document alone.

Corporate Governance Expert

TL;DR: Joint filing by related Weichai entities discloses compliant insider dispositions; signatures and POAs are included.

The Form 4 is filed jointly by three related entities that share voting and dispositive power. The report includes explanatory footnotes and references to Exhibits 24.1 and 24.2 (powers of attorney). Transactions are characterized as Rule 144 broker-dealer sales, indicating an attempt to follow resale safe-harbor procedures. The filing is properly signed by authorized representatives and a CFO, and does not disclose any derivative transactions. Governance-wise, this is a routine disclosure of authorized dispositions rather than an ad hoc insider transfer or 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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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)
08/12/2025

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	08/12/2025		S(1)		478	D	$87.8773(2)	11,749,281	I	See Explanation of Responses(12)
Common Stock	08/12/2025		S(1)		5,874	D	$88.484(3)	11,743,407	I	See Explanation of Responses(12)
Common Stock	08/12/2025		S(1)		1,349	D	$89.3436(4)	11,742,058	I	See Explanation of Responses(12)
Common Stock	08/12/2025		S(1)		8,517	D	$90.2834(5)	11,733,541	I	See Explanation of Responses(12)
Common Stock	08/12/2025		S(1)		10,618	D	$91.6147(6)	11,722,923	I	See Explanation of Responses(12)
Common Stock	08/12/2025		S(1)		12,651	D	$92.4174(7)	11,710,272	I	See Explanation of Responses(12)
Common Stock	08/12/2025		S(1)		12,436	D	$93.6465(8)	11,697,836	I	See Explanation of Responses(12)
Common Stock	08/12/2025		S(1)		15,838	D	$94.4724(9)	11,681,998	I	See Explanation of Responses(12)
Common Stock	08/12/2025		S(1)		46,827	D	$95.5188(10)	11,635,171	I	See Explanation of Responses(12)
Common Stock	08/12/2025		S(1)		9,176	D	$96.1923(11)	11,625,995	I	See Explanation of Responses(12)
Common Stock	08/12/2025		S(1)		58	D	$97.02	11,625,937	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 $87.83 to $87.89, 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 $88.00 to $88.965, 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 $89.03 to $89.95, 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.

5. 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 $90.99, 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 $91.11 to $91.97, 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 $92.00 to $92.98, 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 $93.005 to $93.98, 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 $94.00 to $94.995, 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.

10. 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 $95.9975, 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.

11. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $96.00 to $96.89, 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.) Exhibit 24.2 - Power of Attorney (Shandong Heavy Industry Group Co., Ltd.)

	/s/ Jinguang Liu (aka Jin Liu), Chief Financial Officer, Weichai America Corp.	08/14/2025
	/s/ Chenglong Sun, Authorized Representative, Weichai Power Co., Ltd.	08/14/2025
	/s/ Chenglong Sun, Authorized Representative, Shandong Heavy Industry Group Co., Ltd.	08/14/2025
	** 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 activity was reported for Power Solutions International (PSIX)?

The filing reports multiple broker-dealer sales on 08/12/2025 totaling 123,822 shares disposed by the Reporting Persons.

Who filed the Form 4 reporting these PSIX transactions?

The Form 4 is filed jointly by Weichai America Corp., Weichai Power Co., Ltd. and Shandong Heavy Industry Group Co., Ltd.

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

Following the reported transactions the Reporting Persons beneficially owned 11,625,937 shares (indirect ownership).

Were these sales made under a specific rule or plan?

Yes, the transactions are described as broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933.

Do the filings show the sale prices for PSIX shares?

The Form 4 lists weighted-average prices per line and footnotes disclose the price ranges for each block of shares sold.