<SEC-DOCUMENT>0001209191-23-058974.txt : 20231218
<SEC-HEADER>0001209191-23-058974.hdr.sgml : 20231218
<ACCEPTANCE-DATETIME>20231218164752
ACCESSION NUMBER:		0001209191-23-058974
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20231214
FILED AS OF DATE:		20231218
DATE AS OF CHANGE:		20231218

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Carroll Jill
		CENTRAL INDEX KEY:			0001598542
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-41259
		FILM NUMBER:		231494430

	MAIL ADDRESS:	
		STREET 1:		C/O APPLIED GENETIC TECHNOLOGIES CORP.
		STREET 2:		11801 RESEARCH DRIVE, SUITE D
		CITY:			ALACHUA
		STATE:			FL
		ZIP:			32615

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Arcellx, Inc.
		CENTRAL INDEX KEY:			0001786205
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				472855917
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		25 WEST WATKINS MILL ROAD
		STREET 2:		SUITE A
		CITY:			GAITHERSBURG
		STATE:			MD
		ZIP:			20878
		BUSINESS PHONE:		240-723-6641

	MAIL ADDRESS:	
		STREET 1:		25 WEST WATKINS MILL ROAD
		STREET 2:		SUITE A
		CITY:			GAITHERSBURG
		STATE:			MD
		ZIP:			20878
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-12-14</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001786205</issuerCik>
        <issuerName>Arcellx, Inc.</issuerName>
        <issuerTradingSymbol>ACLX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001598542</rptOwnerCik>
            <rptOwnerName>Carroll Jill</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>985 OLD EAGLE SCHOOL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 511</rptOwnerStreet2>
            <rptOwnerCity>WAYNE</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19087</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2023-12-14</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>504263</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>49.13</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1983411</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Note 1</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The securities are directly held by SR One Capital Fund I Aggregator, LP (&quot;SR One Fund I Aggregator&quot;). SR One Capital Partners I, LP (&quot;SR One Partners I&quot;) serves as the general partner of SR One Fund I Aggregator and SR One Capital Management, LLC serves as the general partner of SR One Partners I. The Reporting Person is a partner of SR One Capital Management, LP, an entity affiliated with SR One Fund I Aggregator, and a limited partner of SR One Partners I. The Reporting Person disclaims beneficial ownership of these securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (&quot;Section 16&quot;), except to the extent of her pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of such securities for Section 16 or any other purpose.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Sasha Keough, attorney-in-fact for Jill Carroll</signatureName>
        <signatureDate>2023-12-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
