<SEC-DOCUMENT>0001961863-24-000125.txt : 20240321
<SEC-HEADER>0001961863-24-000125.hdr.sgml : 20240321
<ACCEPTANCE-DATETIME>20240321183252
ACCESSION NUMBER:		0001961863-24-000125
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20240321
DATE AS OF CHANGE:		20240321

SUBJECT COMPANY:	

	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

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-41259
		FILM NUMBER:		24772615

	BUSINESS ADDRESS:	
		STREET 1:		800 BRIDGE PARKWAY
		CITY:			REDWOOD CITY
		STATE:			CA
		ZIP:			94065
		BUSINESS PHONE:		240-327-0603

	MAIL ADDRESS:	
		STREET 1:		800 BRIDGE PARKWAY
		CITY:			REDWOOD CITY
		STATE:			CA
		ZIP:			94065

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SR One Co-Invest II, LLC
		CENTRAL INDEX KEY:			0001867644
		ORGANIZATION NAME:           	
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144

	BUSINESS ADDRESS:	
		STREET 1:		C/O SR ONE CAPITAL MANAGEMENT, LP
		STREET 2:		985 OLD EAGLE SCHOOL ROAD, SUITE 511
		CITY:			WAYNE
		STATE:			PA
		ZIP:			19087
		BUSINESS PHONE:		610-567-1000

	MAIL ADDRESS:	
		STREET 1:		C/O SR ONE CAPITAL MANAGEMENT, LP
		STREET 2:		985 OLD EAGLE SCHOOL ROAD, SUITE 511
		CITY:			WAYNE
		STATE:			PA
		ZIP:			19087
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001867644</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
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      <liveTestFlag>LIVE</liveTestFlag>


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  <formData>
    <issuerInfo>
      <issuerCik>0001786205</issuerCik>
      <issuerName>Arcellx, Inc.</issuerName>
      <secFileNumber>001-41259</secFileNumber>
      <issuerAddress>
        <com:street1>800 BRIDGE PARKWAY</com:street1>
        <com:city>REDWOOD CITY</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>94065</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>240-327-0603</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>SR One Co-Invest II, LLC</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Shareholder</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Merrill Lynch</name>
        <address>
          <com:street1>555 California Street, Suite 1800</com:street1>
          <com:city>San Francisco</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>94104</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>295737</noOfUnitsSold>
      <aggregateMarketValue>21733712.13</aggregateMarketValue>
      <noOfUnitsOutstanding>52796618</noOfUnitsOutstanding>
      <approxSaleDate>03/21/2024</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>02/08/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Initial Public Offering</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>295737</amountOfSecuritiesAcquired>
      <paymentDate>02/08/2022</paymentDate>
      <natureOfPayment>CASH</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>03/21/2024</noticeDate>
      <signature>James Macadam</signature>
    </noticeSignature>
  </formData>
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</SEC-DOCUMENT>
