Christopher Heery - 18 Dec 2023 Form 4 Insider Report for Arcellx, Inc. (ACLX)

Role: Chief Medical Officer
Signature: /s/ Rami Elghandour, as Attorney-in-Fact
Issuer symbol: ACLX
Transactions as of: 18 Dec 2023
Net transactions value: -$5,266,681
Form type: 4
Filing time: 19 Dec 2023, 16:43:01 UTC
Previous filing: 07 Aug 2023
Next filing: 04 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	$753,600	+120,000	+1539%	$6.28^*	127,795	18 Dec 2023	Direct
transaction	ACLX	Common Stock	Sale	$5,351,758	-106,912	-84%	$50.06	20,883	18 Dec 2023	Direct	F1
transaction	ACLX	Common Stock	Sale	$624,700	-12,243	-59%	$51.03	8,640	18 Dec 2023	Direct	F2
transaction	ACLX	Common Stock	Sale	$43,823	-845	-9.8%	$51.86	7,795	18 Dec 2023	Direct	F3

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)	Options Exercise	$0	-120,000	-50%	$0.000000	120,623	18 Dec 2023	Common Stock	120,000	$6.28	Direct	F4

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

Explanation of Responses:

Id	Content
F1	Represents the weighted average share price of an aggregate total of 106,912 shares sold in the price range of $49.69 to $50.685 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F2	Represents the weighted average share price of an aggregate total of 12,243 shares sold in the price range of $50.69 to $51.66 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F3	Represents the weighted average share price of an aggregate total of 845 shares sold in the price range of $51.69 to $52.02 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F4	Shares issued pursuant to the Issuer's 2017 Equity Incentive Plan (the "2017 Plan"). Subject to the Reporting Person continuing to be a Service Provider (as defined 2017 Plan) through each applicable date, twenty-five percent (25%) of the shares subject to the option shall vest on the one (1) year anniversary of the Vesting Commencement Date, and one forty-eighth (1/48th) of the shares subject to the option shall vest each month thereafter on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month). "Vesting Commencement Date" shall mean April 26, 2021.