<SEC-DOCUMENT>0001213900-25-081116.txt : 20250827
<SEC-HEADER>0001213900-25-081116.hdr.sgml : 20250827
<ACCEPTANCE-DATETIME>20250827160005
ACCESSION NUMBER:		0001213900-25-081116
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250825
FILED AS OF DATE:		20250827
DATE AS OF CHANGE:		20250827

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Weichai America Corp.
		CENTRAL INDEX KEY:			0001702521
		ORGANIZATION NAME:           	
		STATE OF INCORPORATION:			IL
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35944
		FILM NUMBER:		251265100

	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

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Weichai Power Co., Ltd.
		CENTRAL INDEX KEY:			0001703367
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35944
		FILM NUMBER:		251265099

	BUSINESS ADDRESS:	
		STREET 1:		SECTION A 197, FU SHOU EAST STREET
		STREET 2:		HIGH TECHNOLOGY INDUSTRIAL DEVELOP. ZONE
		CITY:			WEIFANG, SHANDONG PROVINCE
		STATE:			F4
		ZIP:			261061
		BUSINESS PHONE:		0531-82623823

	MAIL ADDRESS:	
		STREET 1:		SECTION A 197, FU SHOU EAST STREET
		STREET 2:		HIGH TECHNOLOGY INDUSTRIAL DEVELOP. ZONE
		CITY:			WEIFANG, SHANDONG PROVINCE
		STATE:			F4
		ZIP:			261061

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Shandong Heavy Industry Group Co., Ltd.
		CENTRAL INDEX KEY:			0001703252
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35944
		FILM NUMBER:		251265098

	BUSINESS ADDRESS:	
		STREET 1:		#40-1 YANZI SHAN WEST ROAD
		CITY:			JINAN, SHANDONG PROVINCE
		STATE:			F4
		ZIP:			250014
		BUSINESS PHONE:		0531-82623823

	MAIL ADDRESS:	
		STREET 1:		#40-1 YANZI SHAN WEST ROAD
		CITY:			JINAN, SHANDONG PROVINCE
		STATE:			F4
		ZIP:			250014

ISSUER:		

	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

	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
</SEC-HEADER>
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        <issuerName>POWER SOLUTIONS INTERNATIONAL, INC.</issuerName>
        <issuerTradingSymbol>PSIX</issuerTradingSymbol>
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            <rptOwnerCik>0001702521</rptOwnerCik>
            <rptOwnerName>Weichai America Corp.</rptOwnerName>
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            <rptOwnerStreet1>3100 GOLF ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>ROLLING MEADOWS</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60008</rptOwnerZipCode>
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    <reportingOwner>
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            <rptOwnerCik>0001703367</rptOwnerCik>
            <rptOwnerName>Weichai Power Co., Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>SECTION A 197, FU SHOU EAST STREET</rptOwnerStreet1>
            <rptOwnerStreet2>HIGH-TECH INDUSTRIAL DEV. ZONE</rptOwnerStreet2>
            <rptOwnerCity>WEIFANG, SHANDONG PROVINCE</rptOwnerCity>
            <rptOwnerState>F4</rptOwnerState>
            <rptOwnerZipCode>261061</rptOwnerZipCode>
            <rptOwnerStateDescription>CHINA</rptOwnerStateDescription>
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    <reportingOwner>
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            <rptOwnerCik>0001703252</rptOwnerCik>
            <rptOwnerName>Shandong Heavy Industry Group Co., Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>#40-1 YANZI SHAN WEST ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>JINAN, SHANDONG PROVINCE</rptOwnerCity>
            <rptOwnerState>F4</rptOwnerState>
            <rptOwnerZipCode>250014</rptOwnerZipCode>
            <rptOwnerStateDescription>CHINA</rptOwnerStateDescription>
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            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
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    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
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            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-08-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
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                <footnoteId id="F1"/>
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                <transactionPricePerShare>
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                    <footnoteId id="F2"/>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10854677</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Explanation of Responses</value>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-08-25</value>
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                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
                    <value>89.4774</value>
                    <footnoteId id="F3"/>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <sharesOwnedFollowingTransaction>
                    <value>10846575</value>
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                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Explanation of Responses</value>
                    <footnoteId id="F8"/>
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            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
                <value>2025-08-25</value>
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            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>9003</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>90.3798</value>
                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10837572</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Explanation of Responses</value>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
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                <transactionCode>S</transactionCode>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>12283</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>91.6265</value>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10825289</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Explanation of Responses</value>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <transactionCode>S</transactionCode>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>11395</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>92.5584</value>
                    <footnoteId id="F6"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
                    <value>10813894</value>
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                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Explanation of Responses</value>
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        </nonDerivativeTransaction>
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                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
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            <transactionTimeliness></transactionTimeliness>
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                <transactionShares>
                    <value>3695</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>93.1755</value>
                    <footnoteId id="F7"/>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <sharesOwnedFollowingTransaction>
                    <value>10810199</value>
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                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Explanation of Responses</value>
                    <footnoteId id="F8"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">These transactions occurred pursuant to broker-dealer sales conducted in accordance with Rule 144 under the Securities Act of 1933, as amended.</footnote>
        <footnote id="F2">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $88.525 to $88.9982, 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>
        <footnote id="F3">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $89.00 to $89.995, 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>
        <footnote id="F4">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 $90.95, 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>
        <footnote id="F5">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.01 to $91.9886, 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>
        <footnote id="F6">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $92.0053 to $92.985, 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>
        <footnote id="F7">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 $93.365, 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>
        <footnote id="F8">This report is filed jointly by Weichai America Corp., Weichai Power Co., Ltd. and Shandong Heavy Industry Group Co., Ltd. (collectively, the &quot;Reporting Persons&quot;). 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.</footnote>
    </footnotes>

    <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</remarks>

    <ownerSignature>
        <signatureName>/s/ Jinguang Liu (aka Jin Liu), Chief Financial Officer, Weichai America Corp.</signatureName>
        <signatureDate>2025-08-27</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Chenglong Sun, Authorized Representative, Weichai Power Co., Ltd.</signatureName>
        <signatureDate>2025-08-27</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Chenglong Sun, Authorized Representative, Shandong Heavy Industry Group Co., Ltd.</signatureName>
        <signatureDate>2025-08-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
