<SEC-DOCUMENT>0001104659-26-050371.txt : 20260428
<SEC-HEADER>0001104659-26-050371.hdr.sgml : 20260428
<ACCEPTANCE-DATETIME>20260428161901
ACCESSION NUMBER:		0001104659-26-050371
CONFORMED SUBMISSION TYPE:	S-8 POS
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20260428
DATE AS OF CHANGE:		20260428
EFFECTIVENESS DATE:		20260428

FILER:

	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
		EIN:				472855917
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-8 POS
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-262571
		FILM NUMBER:		26908129

	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>S-8 POS
<SEQUENCE>1
<FILENAME>tm2612746d1_s8pos.htm
<DESCRIPTION>S-8 POS
<TEXT>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>As filed with the Securities
and Exchange Commission on April&nbsp;28, 2026</B>&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Registration No.&nbsp;333-262571</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Registration No.&nbsp;333-269105</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Registration No.&nbsp;333-276346</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Registration No.&nbsp;333-284136</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Registration No.&nbsp;333-292559</B></P>

<!-- Field: Rule-Page --><DIV STYLE="margin-top: 0; margin-bottom: 0; width: 100%"><DIV STYLE="font-size: 1pt; border-top: Black 2pt solid; border-bottom: Black 1pt solid">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"></P>

<P STYLE="font: 5pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right">&nbsp;</P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>UNITED STATES</B></P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Washington, D.C. 20549</B></P>

<P STYLE="border-bottom: Black 1pt solid; font: 3pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 3pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>POST-EFFECTIVE AMENDMENT NO. 1 TO FORM&nbsp;S-8
REGISTRATION STATEMENT NO. 333-262571</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>POST-EFFECTIVE AMENDMENT NO. 1 TO FORM&nbsp;S-8
REGISTRATION STATEMENT NO. 333-269105</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>POST-EFFECTIVE AMENDMENT NO. 1 TO FORM&nbsp;S-8
REGISTRATION STATEMENT NO. 333-276346</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>POST-EFFECTIVE AMENDMENT NO. 1 TO FORM&nbsp;S-8
REGISTRATION STATEMENT NO. 333-284136</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>POST-EFFECTIVE AMENDMENT NO. 1 TO FORM&nbsp;S-8
REGISTRATION STATEMENT NO. 333-292559</B></P>

<P STYLE="font: 5pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>FORM&nbsp;S-8</B></P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>REGISTRATION STATEMENT</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B><I>UNDER</I></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B><I>THE SECURITIES ACT OF 1933</I></B></P>

<P STYLE="border-bottom: Black 1pt solid; font: 3pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 3pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 24pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Arcellx,&nbsp;Inc.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(Exact name of registrant as specified in its
charter)</B></P>

<P STYLE="border-bottom: Black 1pt solid; font: 6pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 5pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
  <TR>
    <TD STYLE="vertical-align: top; font-size: 10pt; text-align: center; width: 49%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Delaware</B></FONT></TD>
    <TD STYLE="vertical-align: bottom; font-size: 10pt; width: 2%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-size: 10pt; text-align: center; width: 49%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>47-2855917</B></FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; font-size: 10pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(State or other jurisdiction of<BR>
incorporation or organization)</B></FONT></TD>
    <TD STYLE="vertical-align: bottom; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="vertical-align: top">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(IRS employer</B></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>identification number)</B></P></TD></TR>
  </TABLE>
<P STYLE="font: 5pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>800 Bridge Parkway</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Redwood City, CA 94065</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(Address of Principal Executive Offices)</B></P>

<P STYLE="font: 5pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>2022 Equity Incentive Plan</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>2017 Equity Incentive Plan</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>2022 Employee Stock Purchase Plan</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(Full title of the Plans)</B></P>

<P STYLE="font: 5pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Andrew D. Dickinson</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>President and Treasurer</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Arcellx,&nbsp;Inc.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>333 Lakeside Drive</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Foster City, CA 94404</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(Name and address of agent for service)</B></P>

<P STYLE="font: 5pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(240) 327-0630</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(Telephone number, including area code, of agent
for service)</B></P>

<P STYLE="border-bottom: Black 1pt solid; font: 3pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 3pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Copy to:</B></P>

<P STYLE="font: 5pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><B>Emily Oldshue</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><B></B> <B>Nicholas Roper</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><B></B> <B>Ropes&nbsp;&amp; Gray LLP</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><B>Prudential Tower, 800 Boylston Street</B> <B></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><B>Boston, Massachusetts 02199</B> <B></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><B>(617) 951-7000</B></P>




<P STYLE="border-bottom: Black 1pt solid; font: 3pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 3pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Indicate by check mark whether the registrant is a large accelerated
filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definitions of &ldquo;large
accelerated filer,&rdquo; &ldquo;accelerated filer,&rdquo; &ldquo;smaller reporting company,&rdquo; and &ldquo;emerging growth company&rdquo;
in Rule&nbsp;12b-2 of the Exchange Act.</P>

<P STYLE="font: 5pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt; width: 20%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Large&nbsp;accelerated&nbsp;filer</FONT></TD>
    <TD STYLE="font-size: 10pt; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#120;</FONT></FONT></TD>
    <TD STYLE="font-size: 10pt; width: 25%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accelerated&nbsp;filer</FONT></TD>
    <TD STYLE="font-size: 10pt; width: 5%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Non-accelerated filer</FONT></TD>
    <TD STYLE="font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></TD>
    <TD STYLE="font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Smaller&nbsp;reporting&nbsp;company</FONT></TD>
    <TD STYLE="font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Emerging&nbsp;growth&nbsp;company</FONT></TD>
    <TD STYLE="font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 5pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: justify; margin: 0pt 0">If an emerging growth company, indicate by check mark if the registrant
has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant
to Section&nbsp;7(a)(2)(B)&nbsp;of the Securities Act.&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</FONT></P>

<P STYLE="font: 5pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <DIV STYLE="margin-top: 12pt; margin-bottom: 6pt; border-bottom: Black 1pt solid"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>DEREGISTRATION OF SECURITIES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">These Post-Effective Amendments (these &ldquo;<U>Post-Effective
Amendments</U>&rdquo;) are being filed by Arcellx,&nbsp;Inc. (the &ldquo;<U>Registrant</U>&rdquo;) to deregister all shares of the Registrant&rsquo;s
common stock, par value $0.001 per share (&ldquo;<U>Shares</U>&rdquo;), that remain unissued under the following Registration Statements
on Form&nbsp;S-8 (each, a &ldquo;<U>Registration Statement</U>&rdquo;, and collectively, the &ldquo;<U>Registration Statements</U>&rdquo;)
previously filed by the Registrant with the U.S. Securities and Exchange Commission (the &ldquo;<U>SEC</U>&rdquo;):</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
  <TR>
    <TD STYLE="width: 5%; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 3%; text-align: justify"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="vertical-align: top; width: 1%; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="https://www.sec.gov/Archives/edgar/data/1786205/000119312522029800/d269275ds8.htm" STYLE="-sec-extract: exhibit">Registration
    Statement No.&nbsp;333-262571</A> pertaining to the registration of (i)&nbsp;1,512,859 Shares issuable under the Registrant&rsquo;s
    2022 Equity Incentive Plan (the &ldquo;<U>2022 Plan</U>&rdquo;), (ii)&nbsp;2,784,016 Shares issuable pursuant to options outstanding
    under the Registrant&rsquo;s 2022 Plan, (iii)&nbsp;312,500 Shares issuable under the Registrant&rsquo;s 2022 Employee Stock Purchase
    Plan (the &ldquo;<U>2022 ESPP</U>&rdquo;), (iv)&nbsp;5,316,437 Shares issuable pursuant to options outstanding under the Registrant&rsquo;s
    2017 Equity Incentive Plan (the &ldquo;<U>2017 Plan</U>&rdquo;) and (v)&nbsp;952,804 Shares issuable pursuant to restricted stock
    units outstanding under the Registrant&rsquo;s 2017 Plan, which was filed with the SEC on February&nbsp;7, 2022. </FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="https://www.sec.gov/Archives/edgar/data/1786205/000119312523000861/d428807ds8.htm" STYLE="-sec-extract: exhibit">Registration
    Statement No.&nbsp;333-269105</A> pertaining to the registration of (i)&nbsp;2,205,299 Shares issuable under the Registrant&rsquo;s
    2022 Plan and (ii)&nbsp;312,500 Shares issuable under the Registrant&rsquo;s 2022 ESPP, as amended and restated, which was filed
    with the SEC on January&nbsp;3, 2023. </FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="https://www.sec.gov/Archives/edgar/data/1786205/000119312524000702/d54365ds8.htm" STYLE="-sec-extract: exhibit">Registration
    Statement No.&nbsp;333-276346</A> pertaining to the registration of (i)&nbsp;2,613,888 Shares issuable under the Registrant&rsquo;s
    2022 Plan and (ii)&nbsp;312,500 Shares issuable under the Registrant&rsquo;s 2022 ESPP, as amended and restated, which was filed
    with the SEC on January&nbsp;2, 2024.</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="https://www.sec.gov/Archives/edgar/data/1786205/000119312525001660/d833036ds8.htm" STYLE="-sec-extract: exhibit">Registration
    Statement No.&nbsp;333-284136</A> pertaining to the registration of (i)&nbsp;2,714,041 Shares issuable under the Registrant&rsquo;s
    2022 Plan and (ii)&nbsp;312,500 Shares issuable under the Registrant&rsquo;s 2022 ESPP, as amended and restated, which was filed
    with the SEC on January&nbsp;6, 2025.</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD STYLE="vertical-align: top; text-align: justify"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><A HREF="https://www.sec.gov/Archives/edgar/data/1786205/000119312526000940/d75969ds8.htm" STYLE="-sec-extract: exhibit">Registration
    Statement No.&nbsp;333-292559</A> pertaining to the registration of (i)&nbsp;2,895,867 Shares issuable under the Registrant&rsquo;s
    2022 Plan and (ii)&nbsp;312,500 Shares issuable under the Registrant&rsquo;s 2022 ESPP, as amended and restated, which was filed
    with the SEC on January&nbsp;2, 2026.</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">On April&nbsp;28, 2026, pursuant to an Agreement
and Plan of Merger (the &ldquo;<U>Merger Agreement</U>&rdquo;), dated as of February&nbsp;22, 2026, by and among the Registrant, Gilead
Sciences,&nbsp;Inc. (&ldquo;<U>Parent</U>&rdquo;) and Ravens Sub,&nbsp;Inc. (&ldquo;<U>Merger Sub</U>&rdquo;), Merger Sub merged with
and into the Registrant (the &ldquo;<U>Merger</U>&rdquo;), with the Registrant continuing as the surviving corporation and becoming a
wholly owned subsidiary of Parent. As a result of the transactions contemplated by the Merger Agreement, the Registrant has terminated
any and all offerings and sales of securities pursuant to the Registration Statements. In accordance with the undertakings made by the
Registrant in each Registration Statement to remove from registration, by means of a post-effective amendment, any of the securities of
the Registrant registered under such Registration Statement which remain unsold at the termination of the offering, the Registrant hereby
terminates the effectiveness of each Registration Statement and removes from registration all of the securities that remain unsold under
each Registration Statement as of the date hereof, if any. Each Registration Statement is hereby amended, as appropriate, to reflect the
deregistration of such securities. After giving effect to these Post-Effective Amendments, there will be no remaining securities registered
by the Registrant pursuant to the Registration Statements.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">The foregoing description of the Merger, the Merger
Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by,
the Merger Agreement, which is attached as <A HREF="https://www.sec.gov/Archives/edgar/data/1786205/000119312526063955/d112937dex21.htm" STYLE="-sec-extract: exhibit">Exhibit&nbsp;2.1</A> to the Registrant&rsquo;s Current Report on Form&nbsp;8-K filed with the SEC
on February&nbsp;23, 2026.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SIGNATURE</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Pursuant to the requirements of the Securities Act of 1933, as amended,
the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form&nbsp;S-8 and
has duly caused these Post-Effective Amendments to be signed on its behalf by the undersigned, thereunto duly authorized, in the City
of Redwood City, State of California, on April&nbsp;28, 2026.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2" STYLE="padding-left: 10pt; font-size: 10pt; text-indent: -10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>ARCELLX,&nbsp;INC.</B></FONT></TD></TR>
  <TR>
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="width: 47%">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD STYLE="padding-left: 10pt; font-size: 10pt; text-indent: -10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">By:</FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid; font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Andrew D. Dickinson</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="padding-left: 10pt; font-size: 10pt; text-indent: -10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Name: Andrew D. Dickinson</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="padding-left: 10pt; font-size: 10pt; text-indent: -10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Title:&nbsp;&nbsp;President and Treasurer</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">No other person is required to sign these Post-Effective Amendments
in reliance upon Rule&nbsp;478 under the Securities Act of 1933, as amended.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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