Kristin Myers - 18 Mar 2025 Form 4 Insider Report for Arcellx, Inc. (ACLX)

Role: Director
Signature: /s/ Michelle Gilson, as Attorney-in-Fact
Issuer symbol: ACLX
Transactions as of: 18 Mar 2025
Net transactions value: $0
Form type: 4
Filing time: 20 Mar 2025, 17:16:53 UTC
Next filing: 30 May 2025
SEC: View on sec.gov

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	ACLX	Stock Option (right to buy)	Award	$0	+16,829		$0.000000	16,829	18 Mar 2025	Common Stock	16,829	$69.87	Direct	F1

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

Explanation of Responses:

Id	Content
F1	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 the 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. "Equity Grant Date" shall mean March 18, 2025.

Content

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 the 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. "Equity Grant Date" shall mean March 18, 2025.