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No individual has beneficial ownership over the Common Stock beneficially owned by the Reporting Persons."}],"balance_after":11697836,"source":{"system":"sec-edgar","filing":"0001213900-25-076588","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1137091/000121390025076588/ownership.xml","form_type":"4"}},{"id":1066766,"issuer":{"id":5108,"kind":"organization","name":"POWER SOLUTIONS INTERNATIONAL, INC."},"owners":[{"id":75385,"kind":"organization","name":"Weichai America Corp.","position":1,"cik":"0001702521","reported_name":"Weichai America Corp.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75386,"kind":"organization","name":"Weichai Power Co., Ltd.","position":2,"cik":"0001703367","reported_name":"Weichai Power Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75387,"kind":"organization","name":"Shandong Heavy Industry Group Co., Ltd.","position":3,"cik":"0001703252","reported_name":"Shandong Heavy Industry Group Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-08-14T20:00:18.000Z","date":"2025-08-12","kind":"sale","planned":false,"acquired":false,"shares":12651,"price":92.4174,"value":1169172.5274,"ownership":{"direct":false,"nature":"See Explanation of Responses"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions occurred pursuant to broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933, as amended."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F12","text":"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."}],"balance_after":11710272,"source":{"system":"sec-edgar","filing":"0001213900-25-076588","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1137091/000121390025076588/ownership.xml","form_type":"4"}},{"id":1066765,"issuer":{"id":5108,"kind":"organization","name":"POWER SOLUTIONS INTERNATIONAL, INC."},"owners":[{"id":75385,"kind":"organization","name":"Weichai America Corp.","position":1,"cik":"0001702521","reported_name":"Weichai America Corp.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75386,"kind":"organization","name":"Weichai Power Co., Ltd.","position":2,"cik":"0001703367","reported_name":"Weichai Power Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75387,"kind":"organization","name":"Shandong Heavy Industry Group Co., Ltd.","position":3,"cik":"0001703252","reported_name":"Shandong Heavy Industry Group Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-08-14T20:00:18.000Z","date":"2025-08-12","kind":"sale","planned":false,"acquired":false,"shares":10618,"price":91.6147,"value":972764.8846,"ownership":{"direct":false,"nature":"See Explanation of Responses"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions occurred pursuant to broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933, as amended."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F12","text":"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."}],"balance_after":11722923,"source":{"system":"sec-edgar","filing":"0001213900-25-076588","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1137091/000121390025076588/ownership.xml","form_type":"4"}},{"id":1066764,"issuer":{"id":5108,"kind":"organization","name":"POWER SOLUTIONS INTERNATIONAL, INC."},"owners":[{"id":75385,"kind":"organization","name":"Weichai America Corp.","position":1,"cik":"0001702521","reported_name":"Weichai America Corp.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75386,"kind":"organization","name":"Weichai Power Co., Ltd.","position":2,"cik":"0001703367","reported_name":"Weichai Power Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75387,"kind":"organization","name":"Shandong Heavy Industry Group Co., Ltd.","position":3,"cik":"0001703252","reported_name":"Shandong Heavy Industry Group Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-08-14T20:00:18.000Z","date":"2025-08-12","kind":"sale","planned":false,"acquired":false,"shares":8517,"price":90.2834,"value":768943.7178,"ownership":{"direct":false,"nature":"See Explanation of Responses"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions occurred pursuant to broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933, as amended."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F12","text":"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."}],"balance_after":11733541,"source":{"system":"sec-edgar","filing":"0001213900-25-076588","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1137091/000121390025076588/ownership.xml","form_type":"4"}},{"id":1066763,"issuer":{"id":5108,"kind":"organization","name":"POWER SOLUTIONS INTERNATIONAL, INC."},"owners":[{"id":75385,"kind":"organization","name":"Weichai America Corp.","position":1,"cik":"0001702521","reported_name":"Weichai America Corp.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75386,"kind":"organization","name":"Weichai Power Co., Ltd.","position":2,"cik":"0001703367","reported_name":"Weichai Power Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75387,"kind":"organization","name":"Shandong Heavy Industry Group Co., Ltd.","position":3,"cik":"0001703252","reported_name":"Shandong Heavy Industry Group Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-08-14T20:00:18.000Z","date":"2025-08-12","kind":"sale","planned":false,"acquired":false,"shares":1349,"price":89.3436,"value":120524.5164,"ownership":{"direct":false,"nature":"See Explanation of Responses"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions occurred pursuant to broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933, as amended."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F12","text":"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."}],"balance_after":11742058,"source":{"system":"sec-edgar","filing":"0001213900-25-076588","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1137091/000121390025076588/ownership.xml","form_type":"4"}},{"id":1066762,"issuer":{"id":5108,"kind":"organization","name":"POWER SOLUTIONS INTERNATIONAL, INC."},"owners":[{"id":75385,"kind":"organization","name":"Weichai America Corp.","position":1,"cik":"0001702521","reported_name":"Weichai America Corp.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75386,"kind":"organization","name":"Weichai Power Co., Ltd.","position":2,"cik":"0001703367","reported_name":"Weichai Power Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75387,"kind":"organization","name":"Shandong Heavy Industry Group Co., Ltd.","position":3,"cik":"0001703252","reported_name":"Shandong Heavy Industry Group Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-08-14T20:00:18.000Z","date":"2025-08-12","kind":"sale","planned":false,"acquired":false,"shares":5874,"price":88.484,"value":519755.016,"ownership":{"direct":false,"nature":"See Explanation of Responses"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions occurred pursuant to broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933, as amended."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F12","text":"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."}],"balance_after":11743407,"source":{"system":"sec-edgar","filing":"0001213900-25-076588","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1137091/000121390025076588/ownership.xml","form_type":"4"}},{"id":1066761,"issuer":{"id":5108,"kind":"organization","name":"POWER SOLUTIONS INTERNATIONAL, INC."},"owners":[{"id":75385,"kind":"organization","name":"Weichai America Corp.","position":1,"cik":"0001702521","reported_name":"Weichai America Corp.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75386,"kind":"organization","name":"Weichai Power Co., Ltd.","position":2,"cik":"0001703367","reported_name":"Weichai Power Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75387,"kind":"organization","name":"Shandong Heavy Industry Group Co., Ltd.","position":3,"cik":"0001703252","reported_name":"Shandong Heavy Industry Group Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-08-14T20:00:18.000Z","date":"2025-08-12","kind":"sale","planned":false,"acquired":false,"shares":478,"price":87.8773,"value":42005.3494,"ownership":{"direct":false,"nature":"See Explanation of Responses"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"These transactions occurred pursuant to broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933, as amended."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F12","text":"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. 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Other terms of the Amended 2018 Warrant as described in the Form 3 filed with the Securities and Exchange Commission by the Reporting Persons on April 10, 2017 remain the same."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"On November 30, 2017, the Issuer entered into a Securities Exchange Agreement  with Weichai America Corp., pursuant to which (i) the 2,385,624 shares of Series B Preferred Stock (such shares of Series B Preferred Stock being convertible into two shares of Common Stock for each share of Series B Preferred Stock) held by Weichai America Corp. were exchanged for 4,771,248 shares of Common Stock and (ii) the 2018 Warrant was amended  (the \"Amended 2018 Warrant\") to (a) provide that the Amended 2018 Warrant is exercisable for Common Stock without the requirement to obtain stockholder approval and is not exercisable for Series B Preferred Stock and (b) permit the Issuer to request the accelerated exercise of the Amended 2018 Warrant to the extent required to meet the funding needs of the Issuer. Other terms of the Amended 2018 Warrant as described in the Form 3 filed with the Securities and Exchange Commission by the Reporting Persons on April 10, 2017 remain the same."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"On November 30, 2017, the Issuer entered into a Securities Exchange Agreement  with Weichai America Corp., pursuant to which (i) the 2,385,624 shares of Series B Preferred Stock (such shares of Series B Preferred Stock being convertible into two shares of Common Stock for each share of Series B Preferred Stock) held by Weichai America Corp. were exchanged for 4,771,248 shares of Common Stock and (ii) the 2018 Warrant was amended  (the \"Amended 2018 Warrant\") to (a) provide that the Amended 2018 Warrant is exercisable for Common Stock without the requirement to obtain stockholder approval and is not exercisable for Series B Preferred Stock and (b) permit the Issuer to request the accelerated exercise of the Amended 2018 Warrant to the extent required to meet the funding needs of the Issuer. Other terms of the Amended 2018 Warrant as described in the Form 3 filed with the Securities and Exchange Commission by the Reporting Persons on April 10, 2017 remain the same."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"On November 30, 2017, the Issuer entered into a Securities Exchange Agreement  with Weichai America Corp., pursuant to which (i) the 2,385,624 shares of Series B Preferred Stock (such shares of Series B Preferred Stock being convertible into two shares of Common Stock for each share of Series B Preferred Stock) held by Weichai America Corp. were exchanged for 4,771,248 shares of Common Stock and (ii) the 2018 Warrant was amended  (the \"Amended 2018 Warrant\") to (a) provide that the Amended 2018 Warrant is exercisable for Common Stock without the requirement to obtain stockholder approval and is not exercisable for Series B Preferred Stock and (b) permit the Issuer to request the accelerated exercise of the Amended 2018 Warrant to the extent required to meet the funding needs of the Issuer. Other terms of the Amended 2018 Warrant as described in the Form 3 filed with the Securities and Exchange Commission by the Reporting Persons on April 10, 2017 remain the same."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F2","text":"On November 30, 2017, the Issuer entered into a Securities Exchange Agreement  with Weichai America Corp., pursuant to which (i) the 2,385,624 shares of Series B Preferred Stock (such shares of Series B Preferred Stock being convertible into two shares of Common Stock for each share of Series B Preferred Stock) held by Weichai America Corp. were exchanged for 4,771,248 shares of Common Stock and (ii) the 2018 Warrant was amended  (the \"Amended 2018 Warrant\") to (a) provide that the Amended 2018 Warrant is exercisable for Common Stock without the requirement to obtain stockholder approval and is not exercisable for Series B Preferred Stock and (b) permit the Issuer to request the accelerated exercise of the Amended 2018 Warrant to the extent required to meet the funding needs of the Issuer. 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This Form 4 shall not deemed to be an admission that any Reporting Person hereunder is the beneficial owner of any of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose."}],"balance_after":7700000,"source":{"system":"sec-edgar","filing":"0001382963-17-000184","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1137091/000138296317000184/edgar.xml","form_type":"4"}},{"id":4237945,"issuer":{"id":5108,"kind":"organization","name":"POWER SOLUTIONS INTERNATIONAL, INC."},"owners":[{"id":75385,"kind":"organization","name":"Weichai America Corp.","position":1,"cik":"0001702521","reported_name":"Weichai America Corp.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75386,"kind":"organization","name":"Weichai Power Co., Ltd.","position":2,"cik":"0001703367","reported_name":"Weichai Power Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":75387,"kind":"organization","name":"Shandong Heavy Industry Group Co., Ltd.","position":3,"cik":"0001703252","reported_name":"Shandong Heavy Industry Group Co., Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-08-10T20:05:42.000Z","date":"2017-08-08","kind":"purchase","acquired":true,"shares":200000,"price":9.5,"value":1900000.0,"ownership":{"direct":false,"nature":"See Explanation of Responses"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This report is filed jointly by Weichai America Corp., Weichai Power Co., Ltd. and Shandong Heavy Industry Group Co., Ltd. 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This Form 4 shall not deemed to be an admission that any Reporting Person hereunder is the beneficial owner of any of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose."}],"balance_after":2928752,"source":{"system":"sec-edgar","filing":"0001382963-17-000131","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1137091/000138296317000131/edgar.xml","form_type":"4"}}]}