Christopher Heery - 02 Jan 2024 Form 4 Insider Report for Arcellx, Inc. (ACLX)

Role: Chief Medical Officer
Signature: /s/ Michelle Gilson, as Attorney-in-Fact
Issuer symbol: ACLX
Transactions as of: 02 Jan 2024
Net transactions value: $0
Form type: 4
Filing time: 04 Jan 2024, 19:32:23 UTC
Previous filing: 19 Dec 2023
Next filing: 08 Jan 2024
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ACLX	Common Stock	Options Exercise	$0	+16,519	+185%	$0.000000	25,457	03 Jan 2024	Direct	F1, F2

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	+60,096		$0.000000	60,096	02 Jan 2024	Common Stock	60,096	$56.15	Direct	F3
transaction	ACLX	Restricted Stock Unit	Award	$0	+39,063		$0.000000	39,063	02 Jan 2024	Common Stock	39,063		Direct	F1, F4
transaction	ACLX	Restricted Stock Unit	Options Exercise	$0	-16,519	-33%	$0.000000	33,039	03 Jan 2024	Common Stock	16,519		Direct	F1, F5

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

Explanation of Responses:

Id	Content
F1	Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock.
F2	Includes 753 shares acquired under the Issuer's 2022 Employee Stock Purchase Plan on May 12, 2023 and 390 shares acquired under the Issuer's 2022 Employee Stock Purchase Plan on November 14, 2023.
F3	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, 2024.
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 2, 2024.
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 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.