<SEC-DOCUMENT>0001474506-25-000146.txt : 20250804
<SEC-HEADER>0001474506-25-000146.hdr.sgml : 20250804
<ACCEPTANCE-DATETIME>20250804172241
ACCESSION NUMBER:		0001474506-25-000146
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250731
FILED AS OF DATE:		20250804
DATE AS OF CHANGE:		20250804

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Suk Jin Wook (Miles)
		CENTRAL INDEX KEY:			0002044498
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-41224
		FILM NUMBER:		251181653

	MAIL ADDRESS:	
		STREET 1:		68 CUMMINGS PARK DRIVE
		CITY:			WOBURN
		STATE:			MA
		ZIP:			01801

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Abpro Holdings, Inc.
		CENTRAL INDEX KEY:			0001893219
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				871013956
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		6 ST JOHNS LANE, FLOOR 5
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10013
		BUSINESS PHONE:		248-890-7200

	MAIL ADDRESS:	
		STREET 1:		6 ST JOHNS LANE, FLOOR 5
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10013

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Atlantic Coastal Acquisition Corp. II
		DATE OF NAME CHANGE:	20211110
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-07-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001893219</issuerCik>
        <issuerName>Abpro Holdings, Inc.</issuerName>
        <issuerTradingSymbol>ABP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002044498</rptOwnerCik>
            <rptOwnerName>Suk Jin Wook (Miles)</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ABPRO HOLDINGS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>68 CUMMINGS PARK DRIVE</rptOwnerStreet2>
            <rptOwnerCity>WOBURN</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01801</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CEO and Chairman</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.0001 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2025-07-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>72035</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.28</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>718512</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The price reported in Column 4 is a weighted average price. The reporting person undertakes to provide to Abpro Holdings, Inc. (the &quot;Company&quot;), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote (2) to this Form 4.</footnote>
        <footnote id="F2">These shares were purchased in multiple transactions at prices ranging from $0.2644 to $0.2979, inclusive.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Miles Suk</signatureName>
        <signatureDate>2025-08-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
