Christopher Heery - Jan 3, 2023 Form 4 Insider Report for Arcellx, Inc. (ACLX)

Role: Chief Medical Officer
Signature: /s/ Michelle Gilson, as Attorney-in-Fact
Stock symbol: ACLX
Transactions as of: Jan 3, 2023
Transactions value $: -$40,275
Form type: 4
Date filed: 1/5/2023, 03:46 PM
Previous filing: Dec 14, 2022
Next filing: Feb 7, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ACLX	Common Stock	Options Exercise	$37.5K	+2.5K		$15.00	2.5K	Jan 3, 2023	Direct
transaction	ACLX	Common Stock	Sale	-$77.8K	-2.5K	-100%	$31.11	0	Jan 3, 2023	Direct	F1

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	+76.2K		$0.00	76.2K	Jan 3, 2023	Common Stock	76.2K	$31.03	Direct	F2
transaction	ACLX	Restricted Stock Unit	Award	$0	+49.6K		$0.00	49.6K	Jan 3, 2023	Common Stock	49.6K		Direct	F3, F4
transaction	ACLX	Stock Option (right to buy)	Options Exercise	$0	-2.5K	-0.99%	$0.00	250K	Jan 3, 2023	Common Stock	2.5K	$15.00	Direct	F5

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

Explanation of Responses:

Id	Content
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 June 30, 2022.
F2	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 forty-eighth (1/48th) of the shares subject to the option will vest each month following the Vesting Commencement Date on the same day of the month as the Vesting Commencement Date (or, if there is no corresponding day in a particular month, then the last day of the month) over four (4) years. "Vesting Commencement Date" shall mean January 1, 2023.
F3	Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock.
F4	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 RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. "RSU Grant Date" shall mean January 3, 2023.
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 forty-eighth (1/48th) of the shares subject to the option will vest each month 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 four (4) years. "Equity Grant Date" shall mean February 3, 2022.