<SEC-DOCUMENT>0001415889-24-008340.txt : 20240318
<SEC-HEADER>0001415889-24-008340.hdr.sgml : 20240318
<ACCEPTANCE-DATETIME>20240318183808
ACCESSION NUMBER:		0001415889-24-008340
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20240315
FILED AS OF DATE:		20240318
DATE AS OF CHANGE:		20240318

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ware Olivia C
		CENTRAL INDEX KEY:			0001663771
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-41259
		FILM NUMBER:		24760529

	MAIL ADDRESS:	
		STREET 1:		11726 SAN VICENTE BLVD
		STREET 2:		SUITE 650
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90049

ISSUER:		

	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

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4-03182024_100301.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2024-03-15</periodOfReport>

    <issuer>
        <issuerCik>0001786205</issuerCik>
        <issuerName>Arcellx, Inc.</issuerName>
        <issuerTradingSymbol>ACLX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001663771</rptOwnerCik>
            <rptOwnerName>Ware Olivia C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ARCELLX, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>800 BRIDGE PARKWAY</rptOwnerStreet2>
            <rptOwnerCity>REDWOOD CITY</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94065</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>1</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2024-03-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>7.61</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2024-03-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1900</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>69.4380</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>7100</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2024-03-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3763</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>70.3610</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3337</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2024-03-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3337</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>70.9863</value>
                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>7.61</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2024-03-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <value>2032-05-16</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>46208</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on December 15, 2023.</footnote>
        <footnote id="F2">Represents the weighted average share price of an aggregate total of 1,900 shares sold in the price range of $68.74 to $69.7399 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F3">Represents the weighted average share price of an aggregate total of 3,763 shares sold in the price range of $69.83 to $70.8299 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F4">Represents the weighted average share price of an aggregate total of 3,337 shares sold in the price range of $70.84 to $71.8399 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.</footnote>
        <footnote id="F5">Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, one-third (1/3rd) of the shares subject to the option will vest each year following Equity Grant Date on the same day of the month as the Equity Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. &quot;Equity Grant Date&quot; shall mean May 16, 2022.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Michelle Gilson, as Attorney-in-Fact</signatureName>
        <signatureDate>2024-03-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>ex24-03182024_100305.htm
<TEXT>
<!DOCTYPE html PUBLIC "-//IETF//DTD HTML//EN">
<html><head><title>ex24-03182024_100305.htm</title></head><body style="margin-top:0;font-family:Times New Roman; font-size:10pt; color:#000000">
<p style="margin:0px; font-size:12pt" align="center"><b>POWER OF ATTORNEY</b></p>
<p style="margin:0px" align="justify"><br></p>
<p style="margin:0px; text-indent:48px; font-size:12pt" align="justify">The undersigned, as a Section 16 reporting person of Arcellx, Inc. (the <font style="font-family:Arial Unicode MS,Times New Roman">&ldquo;</font>Company<font style="font-family:Arial Unicode MS,Times New Roman">&rdquo;</font>), hereby constitutes and appoints Rami Elghandour, Michelle Gilson, Daniel Koeppen and Jennifer Fang as the undersigned<font style="font-family:Arial Unicode MS,Times New Roman">&rsquo;</font>s true and lawful attorneys-in-fact to: </p>
<p style="margin:0px"><br></p>
<p style="margin-top:0px; margin-bottom:-2px; text-indent:48px; width:96px; font-size:12pt; float:left">1.</p>
<p style="margin:0px; padding-left:96px; text-indent:-2px; font-size:12pt" align="justify">complete and execute Forms 3, 4 and 5 and other forms and all amendments thereto as such attorneys-in-fact shall in their discretion determine to be required or advisable pursuant to Section 16 of the Securities Exchange Act of 1934 (as amended) and the rules and regulations promulgated thereunder, or any successor laws and regulations, as a consequence of the undersigned<font style="font-family:Arial Unicode MS,Times New Roman">&rsquo;</font>s ownership, acquisition or disposition of securities of the Company; and</p>
<p style="margin:0px; clear:left" align="justify"><br></p>
<p style="margin-top:0px; margin-bottom:-2px; text-indent:48px; width:96px; font-size:12pt; float:left">2.</p>
<p style="margin:0px; padding-left:96px; text-indent:-2px; font-size:12pt" align="justify">do all acts necessary in order to file such forms with the Securities and Exchange Commission, any securities exchange or national association, the Company and such other person or agency as the attorneys-in-fact shall deem appropriate.</p>
<p style="margin:0px; clear:left" align="justify"><br></p>
<p style="margin:0px; text-indent:48px; font-size:12pt" align="justify">The undersigned hereby ratifies and confirms all that said attorneysin-fact and agent shall do or cause to be done by virtue hereof. &nbsp;The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, is not assuming, nor is the Company assuming, any of the undersigned<font style="font-family:Arial Unicode MS,Times New Roman">&rsquo;</font>s responsibilities to comply with Section&nbsp;16 of the Securities Exchange Act of 1934 (as amended).</p>
<p style="margin:0px" align="justify"><br></p>
<p style="margin:0px; text-indent:48px; font-size:12pt" align="justify">This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 with respect to the undersigned<font style="font-family:Arial Unicode MS,Times New Roman">&rsquo;</font>s holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the Company and the foregoing attorneys-in-fact. </p>
<p style="margin:0px" align="justify"><br></p>
<p style="margin:0px; text-indent:48px; font-size:12pt" align="justify">IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 11th day of June, 2022.</p>
<p style="margin:0px" align="justify"><br></p>
<table style="margin-top:0px; font-size:10pt" cellpadding="0" cellspacing="0" width="100%" align="center"><tr style="font-size:0"><td width="131.267"></td><td width="51.067"></td><td width="151"></td></tr><tr><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px" valign="top" width="131.267"><p style="margin-top:8px; margin-bottom:0px" align="justify"><br></p>
</td><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px" valign="top" width="51.067"><p style="margin-top:8px; margin-bottom:0px; font-size:12pt" align="justify">Signature:</p>
</td><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px; border-bottom:1px solid #000000" valign="top" width="151"><p style="margin-top:8px; margin-bottom:0px; font-size:12pt" align="justify">/s/ Olivia C. Ware</p>
</td></tr><tr><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px" valign="top" width="131.267"><p style="margin-top:8px; margin-bottom:0px" align="justify"><br></p>
</td><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px" valign="top" width="51.067"><p style="margin-top:8px; margin-bottom:0px; font-size:12pt" align="justify">Print Name:</p>
</td><td style="margin-top:0px; padding-left:4px; padding-top:0px; padding-right:4px; padding-bottom:0px; border-bottom:1px solid #000000" valign="top" width="151"><p style="margin-top:8px; margin-bottom:0px; font-size:12pt" align="justify">Olivia C. Ware</p>
</td></tr></table><p style="margin:0px" align="justify"><br></p>
<p style="margin:0px"><br></p>
<p style="margin:0px"><br><br></p>
</body></html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
