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        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001613689</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
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        <issuerInfo>
            <issuerCik>0001786205</issuerCik>
            <issuerName>ARCELLX INC</issuerName>
            <secFileNumber>001-41259</secFileNumber>
            <issuerAddress>
                <ns2:street1>800 Bridge Parkway</ns2:street1>
                <ns2:city>Redwood City</ns2:city>
                <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                <ns2:zipCode>94065</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>2403270603</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>RAMI ELGHANDOUR</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>23086</noOfUnitsSold>
            <aggregateMarketValue>1605631.30</aggregateMarketValue>
            <noOfUnitsOutstanding>52796618</noOfUnitsOutstanding>
            <approxSaleDate>04/01/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>01/03/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>6006</amountOfSecuritiesAcquired>
            <paymentDate>01/03/2024</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/07/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>8037</amountOfSecuritiesAcquired>
            <paymentDate>02/07/2024</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/07/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>9043</amountOfSecuritiesAcquired>
            <paymentDate>02/07/2023</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>RAMI ELGHANDOUR</name>
                <address>
                    <ns2:street1>800 Bridge Parkway</ns2:street1>
                    <ns2:city>Redwood City</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94065</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>02/08/2024</saleDate>
            <amountOfSecuritiesSold>38065</amountOfSecuritiesSold>
            <grossProceeds>2410656.45</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>RAMI ELGHANDOUR</name>
                <address>
                    <ns2:street1>800 Bridge Parkway</ns2:street1>
                    <ns2:city>Redwood City</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94065</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>01/04/2024</saleDate>
            <amountOfSecuritiesSold>29073</amountOfSecuritiesSold>
            <grossProceeds>1606864.71</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>04/01/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>12/28/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Rami Elghandour</signature>
        </noticeSignature>
    </formData>
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144
0001613689
XXXXXXXX
LIVE
0001786205
ARCELLX INC
001-41259
800 Bridge Parkway
Redwood City
CA
94065
2403270603
RAMI ELGHANDOUR
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
23086
1605631.30
52796618
04/01/2024
NASDAQ
Common
01/03/2024
Restricted Stock Units
Issuer
N
6006
01/03/2024
N/A
Common
02/07/2024
Restricted Stock Units
Issuer
N
8037
02/07/2024
N/A
Common
02/07/2023
Restricted Stock Units
Issuer
N
9043
02/07/2023
N/A
N
RAMI ELGHANDOUR
800 Bridge Parkway
Redwood City
CA
94065
Common
02/08/2024
38065
2410656.45
RAMI ELGHANDOUR
800 Bridge Parkway
Redwood City
CA
94065
Common
01/04/2024
29073
1606864.71
04/01/2024
12/28/2023
/s/ Rami Elghandour