Weichai Group Sells 232,683 PSIX Shares; Ownership Falls to 46.5%

Q: What change in ownership does the PSIX Schedule 13D/A report?

The filing reports the Reporting Persons beneficially own 10,716,152 shares (46.5%) after selling 232,683 shares , reducing aggregate ownership by over 1%.

Q: How many shares were sold and when were the sales executed?

Weichai America sold a total of 232,683 shares in open-market transactions on August 22, 2025 (87,210) , August 25, 2025 (51,426) , and August 26, 2025 (94,047) .

Q: At what prices were the PSIX shares sold?

Weighted average prices were: $88.2807 on August 22, $91.0031 on August 25, and $83.2797 on August 26, 2025; individual trade ranges are provided in the filing.

Q: Under what authority were the shares sold?

The sales were conducted under Rule 144 of the Securities Act through a broker-dealer, as disclosed in the amendment.

[SCHEDULE 13D/A] Power Solutions International, Inc. SEC Filing

Filing Impact

(Low)

Filing Sentiment

(Neutral)

Form Type

SCHEDULE 13D/A

Rhea-AI Filing Summary

Amendment No. 9 to Schedule 13D reports that Weichai America, Weichai Power and Shandong Heavy Industry Group (the Reporting Persons) collectively beneficially own 10,716,152 shares of Power Solutions International, Inc. (PSIX), representing 46.5% of the outstanding common stock based on 23,029,846 shares outstanding as of July 31, 2025. This amendment discloses open-market sales by Weichai America of 232,683 shares under Rule 144 executed from August 22鈥�26, 2025, which reduced the aggregate ownership by more than 1% relative to the prior amendment. The filing provides per-date dispositions and weighted average prices for each trading day and states the Reporting Persons will provide detailed price-by-price sale data upon request.

Positive

Transparent disclosure of open-market sales with per-date share counts and weighted average prices
Reporting Persons remain a substantial holder at 46.5% beneficial ownership after the transactions
No disclosed legal or criminal proceedings involving the Reporting Persons or their executives in the past five years

Negative

Aggregate ownership decreased by over 1% due to sales of 232,683 shares executed August 22鈥�26, 2025
Disposition of shares under Rule 144 could be perceived as a reduction in commitment, though motive is not disclosed

Insights

TL;DR Schedule 13D/A discloses a >1% ownership reduction to 46.5% after Rule 144 open-market sales of 232,683 shares.

The amendment provides transparent, itemized disclosure of sales executed August 22鈥�26, 2025, listing shares sold and weighted average prices for each date. Maintaining a 46.5% beneficial stake keeps the Reporting Persons as a substantial holder with potential control influence. The sales were orderly Rule 144 transactions through a broker-dealer rather than block dispositions or transfers to affiliates, which reduces immediate corporate-governance uncertainty. Investors should note the updated public ownership figure and the availability of transaction-level price data on request.

TL;DR The filing documents a modest, disclosed reduction in a controlling shareholder group; disclosure is compliant and preserves governance transparency.

The Reporting Persons collectively remain the largest single holder at 46.5% and the Schedule 13D/A clarifies identity, ownership calculations and the purpose of the trades (sales under Rule 144). The amendment restates organizational relationships and confirms there are no disclosed legal or criminal matters for the reporting entities or their officers over the past five years. From a governance perspective, the disclosure maintains regulatory transparency while reflecting a small decline in aggregate ownership.

08/28/2025 - 04:00 PM

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 9)

POWER SOLUTIONS INTERNATIONAL, INC.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

73933G202

(CUSIP Number)

Weichai America Corp.
Attn: Jinguang Liu (aka Jin Liu), 3100 Golf Road
Rolling Meadows, IL, 60008
(855-922-9001)

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

08/26/2025

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of 搂搂 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

Item 1.

Security and Issuer

(a)

Title of Class of Securities:

Common Stock, par value $0.001 per share

(b)

Name of Issuer:

POWER SOLUTIONS INTERNATIONAL, INC.

(c)

Address of Issuer's Principal Executive Offices:

201 Mittel Drive, Wood Dale, ILLINOIS , 60191.

Item 1 Comment:

This constitutes Amendment No. 9 ("Amendment No. 9") to the Schedule 13D relating to the shares of Common Stock of Power Solutions International, Inc. (the "Issuer") as filed with the SEC on April 7, 2017, as amended by Amendment No. 1, Amendment No. 2, Amendment No. 3, Amendment No. 4, Amendment No. 5, Amendment No. 6, Amendment No. 7 and Amendment No. 8 as filed with the SEC on August 10, 2017, December 5, 2017, August 31, 2018, October 3, 2018, April 26, 2019, August 15, 2025, August 19, 2025 and August 25, 2025, respectively (as so amended, the "Schedule 13D"), by Weichai America Corp. ("Weichai America"), Weichai Power Co., Ltd. ("Weichai Power"), and Shandong Heavy Industry Group Co., Ltd. ("SHIG") (each of Weichai America, Weichai Power, and SHIG a "Reporting Person" and collectively the "Reporting Persons"). Capitalized terms used in this Amendment No. 9 without being defined herein have the respective meanings given to them in the Schedule 13D. This Amendment No. 9 is being filed by the Reporting Persons to report the open market sales by Weichai America of an aggregate of 232,683 shares of the Issuer's Common Stock pursuant to Rule 144 under the Securities Act of 1933, as amended ("Rule 144"), through a broker-dealer from August 22, 2025 to August 26, 2025 (the "Sales"). The Sales resulted in a decrease of over one percent (1%) in the aggregate percentage ownership reported by the Reporting Persons in Amendment No. 8 to the Schedule 13D. Except as specifically amended by this Amendment No. 9, this Schedule 13D is not modified or revised in any way.

Item 2.

Identity and Background

(a)

Item 2(a) is hereby amended and restated as set forth below: This Schedule 13D is being filed by each of the following persons (each, a "Reporting Person" and collectively, the "Reporting Persons"): (i) Weichai America Corp. ("Weichai America"), a company organized under the laws of the State of Illinois; (ii) Weichai Power Co., Ltd. ("Weichai Power"), a joint stock limited company incorporated in the People's Republic of China with limited liability; and (iii) Shandong Heavy Industry Group Co., Ltd. ("SHIG"), a limited liability company incorporated in the People's Republic of China. Weichai America is a wholly-owned subsidiary of Weichai Power, which is in turn controlled by SHIG. SHIG holds less than 20% of the shares in Weichai Power but is able to exercise influence over Weichai Power by virtue of its status as the largest shareholder of Weichai Power and representatives or designees of SHIG currently comprise a majority of members of Weichai Power's board of directors. This Schedule 13D shall not be construed as acknowledging that any of the Reporting Person, for any or all purposes, is a member of a group with the any Reporting Person or any other person.

(c)

Item 2(c) is hereby amended and restated as set forth below: The principal business of Weichai America is to research and develop a full line of off-road natural gas engines and engine components. The principal business of Weichai Power is to operate in the following three main business segments: (i) powertrains, complete vehicles and machines and key components, (ii) intelligent logistics, and (iii) agricultural equipment. The principal business of SHIG is to operate in the following three main business segments: (i) investment and corporation management; (ii) organize, coordinate and manage the operation of subsidiaries; and (iii) development, manufacture, and sale of combustion engines and its ancillary facilities, engineering machineries and other mechanical equipment and components. With respect to each of the Reporting Persons, the names of each of the executive officers and directors or persons holding equivalent positions of such Reporting Person and their respective principal business address, principal occupation or employment and citizenship are provided on Exhibit T to this Schedule 13D, which is incorporated herein by reference.

(d)

Item 2(d) is hereby amended and restated as set forth below: During the last five years, neither any Reporting Person nor, to any Reporting Person's knowledge, any executive officer or director or person holding equivalent positions of the Reporting Persons (each as listed in Exhibit T) has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).

(e)

Item 2(e) is hereby amended and restated as set forth below: During the last five years, neither any Reporting Person nor, to any Reporting Person's knowledge, any executive officer or director or person holding equivalent positions of the Reporting Persons (each as listed in Exhibit T) has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and, as a result of such proceeding, is or was subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f)

Item 2(f) is hereby amended and restated as set forth below: The citizenship of each director or executive officer or person holding equivalent positions of the Reporting Persons is set forth in Exhibit T hereto, which is incorporated herein by reference.

Item 4.

Purpose of Transaction

Item 4 is hereby amended and supplemented by adding the following: On August 8, 2025, Weichai Amercia filed a notice with the SEC on Form 144 relating to the proposed sale of up to 1,150,000 shares of Common Stock in accordance with Rule 144. From August 22, 2025 to August 26, 2025, the Reporting Persons sold an aggregate of 232,683 shares of Common Stock in a series of open-market transactions through a broker-dealer.

Item 5.

Interest in Securities of the Issuer

(a)

Item 5(a) is hereby amended and restated as set forth below: The Reporting Persons may be deemed to beneficially own the shares of Common Stock of the Issuer as set forth on Exhibit Q hereto.

(b)

Item 5(b) is hereby amended and restated as set forth below: The Reporting Persons may be deemed to beneficially own the shares of Common Stock of the Issuer as set forth on Exhibit Q hereto.

(c)

Item 5(c) is hereby amended and restated as set forth below: In connection with the Sales, Weichai America sold 232,683 shares of Common Stock in a series of open-market transactions, through a broker-dealer, pursuant to Rule 144. Details by date, listing the number of shares of Common Stock disposed of and the weighted average price per share, are provided below. August 22, 2025 - Shares Disposed of: 87,210 - Weighted Average Price Per Share: $88.2807 (multiple transactions at prices ranging from $81.19 to $91.768 inclusive) August 25, 2025 - Shares Disposed of: 51,426 - Weighted Average Price Per Share: $91.0031 (multiple transactions at prices ranging from $88.525 to $93.365 inclusive) August 26, 2025 - Shares Disposed of: 94,047 - Weighted Average Price Per Share: $83.2797 (multiple transactions at prices ranging from $80.32 to $89.00 inclusive) The Reporting Persons undertake to provide, upon request by the staff of the SEC, the Issuer, or a security holder of the Issuer, full information regarding the number of shares sold at each separate price for each of the above transactions. Except as set forth above, none of the Reporting Persons has effected any transaction in shares of Common Stock since the most recent filing of Schedule 13D.

Item 7.

Material to be Filed as Exhibits.

Exhibit Q - Beneficial Ownership of the Reporting Persons in the Securities of Power Solutions International, Inc. Exhibit R - Powers 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 S - 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. Exhibit T - Executive Officers, Directors and Control Persons of the Reporting Persons.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Weichai America Corp.

Signature:	/s/ Jinguang Liu (aka Jin Liu)
Name/Title:	Jinguang Liu (aka Jin Liu), Chief Financial Officer
Date:	08/28/2025

Weichai Power Co., Ltd.

Signature:	/s/ Chenglong Sun
Name/Title:	Chenglong Sun, Authorized Representative
Date:	08/28/2025

Shandong Heavy Industry Group Co., Ltd.

Signature:	/s/ Chenglong Sun
Name/Title:	Chenglong Sun, Authorized Representative
Date:	08/28/2025

Source:

FAQ

What change in ownership does the PSIX Schedule 13D/A report?

The filing reports the Reporting Persons beneficially own 10,716,152 shares (46.5%) after selling 232,683 shares, reducing aggregate ownership by over 1%.

How many shares were sold and when were the sales executed?

Weichai America sold a total of 232,683 shares in open-market transactions on August 22, 2025 (87,210), August 25, 2025 (51,426), and August 26, 2025 (94,047).

At what prices were the PSIX shares sold?

Weighted average prices were: $88.2807 on August 22, $91.0031 on August 25, and $83.2797 on August 26, 2025; individual trade ranges are provided in the filing.

Under what authority were the shares sold?

The sales were conducted under Rule 144 of the Securities Act through a broker-dealer, as disclosed in the amendment.

Will more detailed transaction data be made available?

Yes. The Reporting Persons state they will provide, upon request by the SEC staff, the Issuer, or a security holder, full information regarding the number of shares sold at each separate price.

AG真人官方

[SCHEDULE 13D/A] Power Solutions International, Inc. SEC Filing

Insights

FAQ

What change in ownership does the PSIX Schedule 13D/A report?

How many shares were sold and when were the sales executed?

At what prices were the PSIX shares sold?

Under what authority were the shares sold?

Will more detailed transaction data be made available?

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[SCHEDULE 13D/A] Power Solutions International, Inc. SEC Filing

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FAQ

What change in ownership does the PSIX Schedule 13D/A report?

How many shares were sold and when were the sales executed?

At what prices were the PSIX shares sold?

Under what authority were the shares sold?

Will more detailed transaction data be made available?

NASDAQ:PSIX

PSIX Rankings

PSIX Latest News

PSIX Latest SEC Filings

PSIX Stock Data