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            <relationshipsToIssuer>
                <relationshipToIssuer>Director</relationshipToIssuer>
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            <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>
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            <noOfUnitsOutstanding>55106703</noOfUnitsOutstanding>
            <approxSaleDate>06/10/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
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            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>06/10/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Stock Options</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
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            <paymentDate>06/10/2025</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
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        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
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                <address>
                    <ns2:street1>800 Bridge Parkway</ns2:street1>
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                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94065</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/20/2025</saleDate>
            <amountOfSecuritiesSold>1500</amountOfSecuritiesSold>
            <grossProceeds>87645.00</grossProceeds>
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                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94065</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
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            <grossProceeds>96300.00</grossProceeds>
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                    <ns2:zipCode>94065</ns2:zipCode>
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            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>04/08/2025</saleDate>
            <amountOfSecuritiesSold>1500</amountOfSecuritiesSold>
            <grossProceeds>86250.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
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                <name>10b5-1 Sales for KAVITA K PATEL</name>
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                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94065</ns2:zipCode>
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            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>03/18/2025</saleDate>
            <amountOfSecuritiesSold>1500</amountOfSecuritiesSold>
            <grossProceeds>107460.00</grossProceeds>
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        <noticeSignature>
            <noticeDate>06/10/2025</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>03/28/2024</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Kavita K Patel</signature>
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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
1500
100290.00
55106703
06/10/2025
NASDAQ
Common
06/10/2025
Exercise of Stock Options
Issuer
N
1500
06/10/2025
Cash
N
10b5-1 Sales for KAVITA K PATEL
800 Bridge Parkway
Redwood City
CA
94065
Common
05/20/2025
1500
87645.00
10b5-1 Sales for KAVITA K PATEL
800 Bridge Parkway
Redwood City
CA
94065
Common
04/29/2025
1500
96300.00
10b5-1 Sales for KAVITA K PATEL
800 Bridge Parkway
Redwood City
CA
94065
Common
04/08/2025
1500
86250.00
10b5-1 Sales for KAVITA K PATEL
800 Bridge Parkway
Redwood City
CA
94065
Common
03/18/2025
1500
107460.00
06/10/2025
03/28/2024
/s/ Kavita K Patel