# EDGAR Filing Document

**Accession Number:** 0001137091
**File Stem:** 0001213900-25-081718
**Filing Date:** 2025-8
**Character Count:** 21754
**Document Hash:** fcc6448d4232d830f9f1195909c263fd
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-25-081718.hdr.sgml**: 20250828

**ACCESSION NUMBER**: 0001213900-25-081718

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20250828

**DATE AS OF CHANGE**: 20250828

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** POWER SOLUTIONS INTERNATIONAL, INC.
- **CENTRAL INDEX KEY:** 0001137091
- **STANDARD INDUSTRIAL CLASSIFICATION:** ENGINES & TURBINES [3510]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 330963637
- **STATE OF INCORPORATION:** IL
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-84256
- **FILM NUMBER:** 251273196

**BUSINESS ADDRESS:**
- **STREET 1:** 201 MITTEL DRIVE
- **CITY:** WOOD DALE
- **STATE:** IL
- **ZIP:** 60191
- **BUSINESS PHONE:** 630-350-9400

**MAIL ADDRESS:**
- **STREET 1:** 201 MITTEL DRIVE
- **CITY:** WOOD DALE
- **STATE:** IL
- **ZIP:** 60191

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FORMAT INC
- **DATE OF NAME CHANGE:** 20060901

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FORMAT INC /FA/
- **DATE OF NAME CHANGE:** 20010321
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Weichai America Corp.
- **CENTRAL INDEX KEY:** 0001702521

**ORGANIZATION NAME:**
- **EIN:** 363736971
- **STATE OF INCORPORATION:** IL
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** 3100 GOLF ROAD
- **CITY:** ROLLING MEADOWS
- **STATE:** IL
- **ZIP:** 60008
- **BUSINESS PHONE:** 847-725-7030

**MAIL ADDRESS:**
- **STREET 1:** 3100 GOLF ROAD
- **CITY:** ROLLING MEADOWS
- **STATE:** IL
- **ZIP:** 60008

## Ex-99.Q

**Exhibit Q**

**BENEFICIAL OWNERSHIP OF THE REPORTING PERSONS IN THE SECURITIES OF**

**POWER SOLUTIONS INTERNATIONAL, INC.**

The aggregate number of securities and percentage of the class of securities of the Issuer beneficially owned by each Reporting Person, as well as the number of securities as to which such person is deemed to have sole power to vote or to direct the vote, shared power to vote or to direct the vote, sole power to dispose or to direct the disposition, shared power to dispose or direct the disposition, is set forth in the following table:

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
|  | **Number of Shares** | **Number of Shares** | **Number of Shares** | **Number of Shares** | **Number of Shares** | |
|  | **Shares**<br> **Beneficially** | **Power to Vote** | **Power to Vote** | **Power to Dispose** | **Power to Dispose** | |
| **Reporting Person** | **Owned** | **Sole** | **Shared<sup>(1)</sup>** | **Sole** | **Shared<sup>(1)</sup>** |<br>**Percent**<br>**of Class<sup>(2)</sup>** |
| Weichai America | 10716152 | 0 | 10716152 | 0 | 10716152 | 46.5% |
| Weichai Power | 10716152 | 0 | 10716152 | 0 | 10716152 | 46.5% |
| SHIG | 10716152 | 0 | 10716152 | 0 | 10716152 | 46.5% |
| **Total<sup>(3)</sup> (all Reporting Persons)** | **10716152** | **0** | **10716152** | **0** | **10716152** | **46.5%** |

---

(1) Weichai
 America is the direct and record owner of 10,716,152 shares of Common Stock and shares the
 power to vote and the power to dispose of all of such shares of Common Stock with Weichai
 Power and SHIG by virtue of the fact that Weichai Power is Weichai America's parent
 company, and Weichai Power is 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. From August 22,
 2025 to August 26, 2025, Weichai America sold an aggregate of 232,683 shares of Common Stock
 in a series of open-market transactions pursuant to Rule 144. Following the Sales, the number
 of shares beneficially owned by the Reporting Persons represents 10,716,152 shares of Common
 Stock, and that the Reporting Persons together with all affiliates of the Reporting Persons
 hold an aggregate number of shares of Common Stock equal to 46.5% of the shares of Common
 Stock outstanding.

(2) The
 beneficial ownership percentage is calculated in accordance with Rule 13d-3 under the Securities
 Exchange Act of 1934, as amended, based upon information from the Issuer's Quarterly
 Report on Form 10-Q filed on August 8, 2025 that, as of July 31, 2025, there were 23,029,846
 shares of Common Stock outstanding.

(3) The
 Reporting Persons disclaim membership in a group.

## Ex-99.T

**Exhibit T**

**Executive Officers, Directors and Control Persons of the Reporting Persons**

The following are each of the executive officers and directors or person holding equivalent positions of Weichai America Corp. and their principal occupation or employment and citizenship. Unless otherwise indicated, the principal business address of each of the individuals listed below is 3100 Golf Road, Rolling Meadows, IL, 60008.

---

| | | |
|:---|:---|:---|
| **Name** | **Principal Occupation** | **Citizenship** |
| **Board of Directors** | **Board of Directors** | **Board of Directors** |
| Yang Xuesen | Chairman of the Board | PRC |
| Zhang Jiwen | Vice Chairman of the Board | PRC |
| Tan Zhichao | Director | PRC |
| Yu Fuzhang | Director | PRC |
| **Executive Management** | **Executive Management** | **Executive Management** |
| Zhang Jiwen | Chief Executive Officer | PRC |
| Yang Xuesen | Chief Operating Officer | PRC |
| Liu Jinguang (aka Jin Liu) | Chief Financial Officer | United States |
| Xu Taifa | Vice President | PRC |
| Philippe Guyony | Vice President | United States |
| Zhang Jiyong | Vice President / Secretary | PRC |

---

The following are each of the executive officers and directors or person holding equivalent positions of Weichai Power Co., Ltd. and their respective principal occupation or employment and citizenship. Unless otherwise indicated, the principal business address of each of the individuals listed below is Section A 197, Fu Shou East Street, High Technology Industrial Development Zone, Weifang, Shandong Province, The People's Republic of China, 261061.

---

| | | |
|:---|:---|:---|
| **Name** | **Principal Occupation** | **Citizenship** |
| **Board of Directors** | **Board of Directors** | **Board of Directors** |
| Ma Changhai | Chairman of the Board | PRC |
| Wang Decheng | Executive Director | PRC |
| Huang Weibiao | Executive Director | PRC |
| Sun Shaojun | Executive Director | PRC |
| Yuan Hongming | Executive Director | PRC |
| Ma Xuyao | Executive Director | PRC |
| Zhang Liangfu | Non-Executive Director | PRC |
| Richard Robinson Smith | Non-Executive Director | Germany / United States |
| Michael Martin Macht | Non-Executive Director | Germany |
| Jiang Yan | Independent Director | PRC |
| Chi Deqiang | Independent Director | PRC |
| Zhao Fuquan | Independent Director | United States |
| Xu Bing | Independent Director | PRC |
| Tao Hua'an | Independent Director | PRC |
| **Executive Management** | **Executive Management** | **Executive Management** |
| Wang Decheng | General Manager | PRC |
| Wang Cuiping | Chief Financial Officer | PRC |
| Guo Shenggang | Deputy General Manager | PRC |
| Cheng Guangxu | Deputy General Manager | PRC |
| Zhi Baojing | Deputy General Manager | PRC |
| Ding Yingdong | Deputy General Manager | PRC |
| Wang Lingjin | Deputy General Manager | PRC |
| Wang Li | Secretary of the Board | PRC |
| Hu Yunyun | Company Secretary | PRC |

---

The following are each of the executive officers and directors or person holding equivalent positions of Shandong Heavy Industry Group Co., Ltd. and their principal occupation or employment and citizenship. Unless otherwise indicated, the principal business address of each of the individuals listed below is #40-1 Yanzi Shan West Road, Jinan, Shandong, The People's Republic of China, 250014.

---

| | | |
|:---|:---|:---|
| **Name** | **Principal Occupation** | **Citizenship** |
| **Board of Directors** | **Board of Directors** | **Board of Directors** |
| Wang Zhijian | Director | PRC |
| Ye Jianjun | Director | PRC |
| Wang Yuejun | Employee Director | PRC |
| Yin Ke | External Director | PRC |
| Ding Huiping | External Director | PRC |
| Lu Yi | External Director | Singapore |
| Ning Xiangdong | External Director | PRC |
| **Executive Management** | **Executive Management** | **Executive Management** |
| Wang Zhijian | General Manager | PRC |
| Hu Haihua | Deputy General Manager | PRC |
| Zhang Gengsheng | Deputy General Manager | PRC |
| Ma Changhai | Deputy General Manager | PRC |

---

### UNITED STATES 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.**<br>Attn: Jinguang Liu (aka Jin Liu)<br>3100 Golf Road<br>Rolling Meadows IL 60008<br>(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)*

| **CUSIP No.** | **73933G202** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Weichai America Corp.** | Name of reporting person<br>**Weichai America Corp.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**ILLINOIS** | Citizenship or place of organization<br>**ILLINOIS** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**10716152.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**10716152.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**10716152.00** | Aggregate amount beneficially owned by each reporting person<br>**10716152.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**46.5%** | Percent of class represented by amount in Row (11)<br>**46.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** 1. The number of shares beneficially owned represents 10,716,152 shares of Common Stock held by the Reporting Persons.

2. The beneficial ownership percentage is calculated in accordance with Rule 13d-3 under the Securities Exchange Act of 1934, as amended, based upon information from the Issuer's Quarterly Report on Form 10-Q filed on August 8, 2025 that, as of July 31, 2025, there were 23,029,846 shares of Common Stock outstanding.

| **CUSIP No.** | **73933G202** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Weichai Power Co., Ltd.** | Name of reporting person<br>**Weichai Power Co., Ltd.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**CHINA** | Citizenship or place of organization<br>**CHINA** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**10716152.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**10716152.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**10716152.00** | Aggregate amount beneficially owned by each reporting person<br>**10716152.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**46.5%** | Percent of class represented by amount in Row (11)<br>**46.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** 1. The number of shares beneficially owned represents 10,716,152 shares of Common Stock held by the Reporting Persons.

2. The beneficial ownership percentage is calculated in accordance with Rule 13d-3 under the Securities Exchange Act of 1934, as amended, based upon information from the Issuer's Quarterly Report on Form 10-Q filed on August 8, 2025 that, as of July 31, 2025, there were 23,029,846 shares of Common Stock outstanding.

| **CUSIP No.** | **73933G202** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Shandong Heavy Industry Group Co., Ltd.** | Name of reporting person<br>**Shandong Heavy Industry Group Co., Ltd.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**CHINA** | Citizenship or place of organization<br>**CHINA** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**10716152.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**10716152.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**10716152.00** | Aggregate amount beneficially owned by each reporting person<br>**10716152.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**46.5%** | Percent of class represented by amount in Row (11)<br>**46.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

**Comment for Reporting Person:** 1. The number of shares beneficially owned represents 10,716,152 shares of Common Stock held by the Reporting Persons.

2. The beneficial ownership percentage is calculated in accordance with Rule 13d-3 under the Securities Exchange Act of 1934, as amended, based upon information from the Issuer's Quarterly Report on Form 10-Q filed on August 8, 2025 that, as of July 31, 2025, there were 23,029,846 shares of Common Stock outstanding.

**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, IL, 60191

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 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.

### 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.

**Reporting Person:** Weichai America Corp.

**Signature:** /s/ Jinguang Liu (aka Jin Liu)

**Name/Title:** Jinguang Liu (aka Jin Liu), Chief Financial Officer

**Date:** 08/28/2025

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.

**Reporting Person:** Weichai Power Co., Ltd.

**Signature:** /s/ Chenglong Sun

**Name/Title:** Chenglong Sun, Authorized Representative

**Date:** 08/28/2025

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.

**Reporting Person:** Shandong Heavy Industry Group Co., Ltd.

**Signature:** /s/ Chenglong Sun

**Name/Title:** Chenglong Sun, Authorized Representative

**Date:** 08/28/2025