Weichai America Corp. - 11 Sep 2025 Form 4 Insider Report for POWER SOLUTIONS INTERNATIONAL, INC. (PSIX)

Reporting relationship: 10%+ Owner
Issuer ticker: PSIX
Reported as of: 11 Sep 2025
Net transaction value: -$7,461,417
SEC form: 4
Accepted by SEC: 15 Sep 2025, 17:02:47 UTC
Prior SEC filing: 12 Sep 2025
Source filing: View source filing
Reporting owner signature: /s/ Jinguang Liu (aka Jin Liu), Chief Financial Officer, Weichai America Corp.

Key filing fact

Weichai America Corp. filed Form 4 for POWER SOLUTIONS INTERNATIONAL, INC. (PSIX) on 15 Sep 2025.

Key facts

This page summarizes Weichai America Corp.'s Form 4 filing for POWER SOLUTIONS INTERNATIONAL, INC. (PSIX).
4 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 15 Sep 2025, 17:02.

Change

Previous filing in this sequence was filed on 12 Sep 2025.
Current net transaction value: -$7,461,417.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (3)

CIK 0001702521 Primary reporting owner

Weichai America Corp.

Relationship: 10%+ Owner
Address: 3100 GOLF ROAD, ROLLING MEADOWS
Signature: /s/ Jinguang Liu (aka Jin Liu), Chief Financial Officer, Weichai America Corp.
Signature date: 15 Sep 2025

CIK 0001703367

Weichai Power Co., Ltd.

Relationship: 10%+ Owner
Address: SECTION A 197, FU SHOU EAST STREET, HIGH-TECH INDUSTRIAL DEV. ZONE, WEIFANG, SHANDONG PROVINCE, CHINA
Signature: /s/ Chenglong Sun, Authorized Representative, Weichai Power Co., Ltd.
Signature date: 15 Sep 2025

CIK 0001703252

Shandong Heavy Industry Group Co., Ltd.

Relationship: 10%+ Owner
Address: #40-1 YANZI SHAN WEST ROAD, JINAN, SHANDONG PROVINCE, CHINA
Signature: /s/ Chenglong Sun, Authorized Representative, Shandong Heavy Industry Group Co., Ltd.
Signature date: 15 Sep 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

PSIX transaction

Common Stock

Sale

Transaction value: $617,984
Shares: -6,738
Change %: -0.06%
Price: $91.72
Shares after: 10,672,860
Date: 11 Sep 2025
Ownership: See Explanation of Responses
Footnotes: F1, F2, F6

PSIX transaction

Common Stock

Sale

Transaction value: $1,789,176
Shares: -19,351
Change %: -0.18%
Price: $92.46
Shares after: 10,653,509
Date: 11 Sep 2025
Ownership: See Explanation of Responses
Footnotes: F1, F3, F6

PSIX transaction

Common Stock

Sale

Transaction value: $2,175,458
Shares: -23,231
Change %: -0.22%
Price: $93.64
Shares after: 10,630,278
Date: 11 Sep 2025
Ownership: See Explanation of Responses
Footnotes: F1, F4, F6

PSIX transaction

Common Stock

Sale

Transaction value: $2,878,799
Shares: -30,519
Change %: -0.29%
Price: $94.33
Shares after: 10,599,759
Date: 11 Sep 2025
Ownership: See Explanation of Responses
Footnotes: F1, F5, F6

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

These transactions occurred pursuant to broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933, as amended.

Footnote F2

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.36 to $91.99, 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.

Footnote F3

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 $92.97, 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.

Footnote F4

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $93.00 to $93.99, 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.

Footnote F5

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 $94.98, 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.

Footnote F6

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.

SEC 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