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    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001670683</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <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>KAVITA K PATEL</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Director</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>7500</noOfUnitsSold>
            <aggregateMarketValue>472575.00</aggregateMarketValue>
            <noOfUnitsOutstanding>54074670</noOfUnitsOutstanding>
            <approxSaleDate>02/25/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/25/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Stock Options</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>7500</amountOfSecuritiesAcquired>
            <paymentDate>02/25/2025</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for KAVITA K PATEL</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>02/04/2025</saleDate>
            <amountOfSecuritiesSold>1500</amountOfSecuritiesSold>
            <grossProceeds>96855.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for KAVITA K PATEL</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>01/14/2025</saleDate>
            <amountOfSecuritiesSold>1500</amountOfSecuritiesSold>
            <grossProceeds>98801.25</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for KAVITA K PATEL</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>12/24/2024</saleDate>
            <amountOfSecuritiesSold>1500</amountOfSecuritiesSold>
            <grossProceeds>115450.50</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for KAVITA K PATEL</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>12/03/2024</saleDate>
            <amountOfSecuritiesSold>1500</amountOfSecuritiesSold>
            <grossProceeds>137817.75</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.&#13;
</remarks>
        <noticeSignature>
            <noticeDate>02/25/2025</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>03/28/2024</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Kavita K Patel</signature>
        </noticeSignature>
    </formData>
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144
0001670683
XXXXXXXX
LIVE
0001786205
ARCELLX, INC.
001-41259
800 Bridge Parkway
Redwood City
CA
94065
2403270603
KAVITA K PATEL
Director
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
7500
472575.00
54074670
02/25/2025
NASDAQ
Common
02/25/2025
Exercise of Stock Options
Issuer
N
7500
02/25/2025
Cash
N
10b5-1 Sales for KAVITA K PATEL
800 Bridge Parkway
Redwood City
CA
94065
Common
02/04/2025
1500
96855.00
10b5-1 Sales for KAVITA K PATEL
800 Bridge Parkway
Redwood City
CA
94065
Common
01/14/2025
1500
98801.25
10b5-1 Sales for KAVITA K PATEL
800 Bridge Parkway
Redwood City
CA
94065
Common
12/24/2024
1500
115450.50
10b5-1 Sales for KAVITA K PATEL
800 Bridge Parkway
Redwood City
CA
94065
Common
12/03/2024
1500
137817.75
The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale.
02/25/2025
03/28/2024
/s/ Kavita K Patel