<SEC-DOCUMENT>0001213900-25-070635.txt : 20250801
<SEC-HEADER>0001213900-25-070635.hdr.sgml : 20250801
<ACCEPTANCE-DATETIME>20250801163009
ACCESSION NUMBER:		0001213900-25-070635
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250730
FILED AS OF DATE:		20250801
DATE AS OF CHANGE:		20250801

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BEST SPAC I (Holdings) Corp.
		CENTRAL INDEX KEY:			0002051637
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42700
		FILM NUMBER:		251176587

	BUSINESS ADDRESS:	
		STREET 1:		RM 401-402, 4/F WESTLANDS CTR
		STREET 2:		20 WESTLANDS RD
		CITY:			QUARRY BAY
		STATE:			K3
		ZIP:			00000
		BUSINESS PHONE:		852-9828-3397

	MAIL ADDRESS:	
		STREET 1:		RM 401-402, 4/F WESTLANDS CTR
		STREET 2:		20 WESTLANDS RD
		CITY:			QUARRY BAY
		STATE:			K3
		ZIP:			00000

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BEST SPAC I Acquisition Corp.
		CENTRAL INDEX KEY:			0002051587
		STANDARD INDUSTRIAL CLASSIFICATION:	BLANK CHECKS [6770]
		ORGANIZATION NAME:           	05 Real Estate & Construction
		EIN:				000000000
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		701, 7/FLOOR, UNITED BUILDING
		STREET 2:		17-19 JUBILEE STREET
		CITY:			HONG KONG
		PROVINCE COUNTRY:   	K3
		BUSINESS PHONE:		852-9828-3397

	MAIL ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		701, 7/FLOOR, UNITED BUILDING
		STREET 2:		17-19 JUBILEE STREET
		CITY:			HONG KONG
		PROVINCE COUNTRY:   	K3

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BEST SPAC I Acquistion Corp.
		DATE OF NAME CHANGE:	20250110
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>ownership.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-07-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0002051587</issuerCik>
        <issuerName>BEST SPAC I Acquisition Corp.</issuerName>
        <issuerTradingSymbol>BSAA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002051637</rptOwnerCik>
            <rptOwnerName>BEST SPAC I (Holdings) Corp.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BEST SPAC I ACQUISITION CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>701, 7 FLR, UNITED BLDG 17-19 JUBILEE ST</rptOwnerStreet2>
            <rptOwnerCity>CENTRAL</rptOwnerCity>
            <rptOwnerState>K3</rptOwnerState>
            <rptOwnerZipCode>00000</rptOwnerZipCode>
            <rptOwnerStateDescription>HONG KONG</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Class B ordinary shares</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2025-07-30</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>206250</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A ordinary shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>206250</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1375000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On July 30, 2025, BEST SPAC I (Holdings) Corp. forfeited for no consideration an aggregate of 206,250 shares of Class B ordinary shares, which were subsequently cancelled by BEST SPAC I Acquisition Corp. The Issuer's Class B ordinary shares are convertible into the Issuer's Class A ordinary shares on a one-for-one basis at the Reporting Person's election and has no expiration date. Mr. Yun Chen and Mr. Kam Chi Kin share voting and dispositive power over the securities held by the Reporting Person.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Yun Chen, as authorized signatory</signatureName>
        <signatureDate>2025-08-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
