<SEC-DOCUMENT>0001968582-23-000104.txt : 20230511
<SEC-HEADER>0001968582-23-000104.hdr.sgml : 20230511
<ACCEPTANCE-DATETIME>20230511173157
ACCESSION NUMBER:		0001968582-23-000104
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20230511
DATE AS OF CHANGE:		20230511

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Arcellx, Inc.
		CENTRAL INDEX KEY:			0001786205
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		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:		23912382

	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

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SR ONE CAPITAL MANAGEMENT, LLC
		CENTRAL INDEX KEY:			0001853723
		IRS NUMBER:				843383413
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144

	BUSINESS ADDRESS:	
		STREET 1:		985 OLD EAGLE SCHOOL ROAD
		STREET 2:		SUITE 511
		CITY:			WAYNE
		STATE:			PA
		ZIP:			19087
		BUSINESS PHONE:		(610) 766-2240

	MAIL ADDRESS:	
		STREET 1:		985 OLD EAGLE SCHOOL ROAD
		STREET 2:		SUITE 511
		CITY:			WAYNE
		STATE:			PA
		ZIP:			19087
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
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    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001853723</cik>
          <ccc>XXXXXXXX</ccc>
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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>25 West Watkins Mill Road</com:street1>
        <com:city>Gaithersburg</com:city>
        <com:stateOrCountry>MD</com:stateOrCountry>
        <com:zipCode>20878</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>240-723-6641</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>SR ONE CAPITAL MANAGEMENT LLC</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>affiliate</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>J.P. Morgan Securities LLC</name>
        <address>
          <com:street1>360 Madison Avenue - 6th Floor</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10017</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>1200000</noOfUnitsSold>
      <aggregateMarketValue>56172000</aggregateMarketValue>
      <noOfUnitsOutstanding>47993520</noOfUnitsOutstanding>
      <approxSaleDate>05/11/2023</approxSaleDate>
      <securitiesExchangeName>Nasdaq</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>02/17/2020</acquiredDate>
      <natureOfAcquisitionTransaction>Series A converted to common shares at IPO</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1550309</amountOfSecuritiesAcquired>
      <paymentDate>02/17/2020</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>05/11/2023</noticeDate>
      <signature>/s/ JPMS LLC as agent and attorney-in-fact for SR ONE CAPITAL FUND I AGGREGATOR, LP</signature>
    </noticeSignature>
  </formData>
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