Rami Elghandour - 28 Aug 2025 Form 4 Insider Report for Arcellx, Inc. (ACLX)

Role: President, CEO and Chairman of the Board, Director
Signature: /s/ Michelle Gilson, as Attorney-in-Fact
Issuer symbol: ACLX
Transactions as of: 28 Aug 2025
Net transactions value: -$38,422,394
Form type: 4
Filing time: 29 Aug 2025, 16:21:55 UTC
Previous filing: 27 Feb 2025
Next filing: 06 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Elghandour Rami	President, CEO and Chairman of the Board, Director	C/O ARCELLX, INC, 800 BRIDGE PARKWAY, REDWOOD CITY	/s/ Michelle Gilson, as Attorney-in-Fact	29 Aug 2025	0001613689

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ACLX	Common Stock	Tax liability	$38,422,394	-546,938	-47%	$70.25	617,919	28 Aug 2025	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Shares forfeited to satisfy the Reporting Person's tax withholding obligations in connection with the settlement of performance-based restricted stock units which vested on February 27, 2025, as previously reported in the Form 4 filed February 27, 2025.

Remarks:

President, CEO and Chairman of the Board