Arcellx, Inc. — Director's Dealing 2025

Jan 11, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Arcellx, Inc. (ACLX)
CIK: 0001786205
Period of Report: 2025-01-07

Reporting Person: Elghandour Rami (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-01-03	Common Stock	M	53097	—	Acquired	177809	Direct
2025-01-07	Common Stock	S	16474	$75.5283	Disposed	131112	Direct
2025-01-08	Common Stock	S	13837	$73.6929	Disposed	117275	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-01-03	Restricted Stock Unit	$	M	53097	Disposed		Common Stock (53097)	Direct

Footnotes

F1: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock. Vesting of these RSUs previously reported in the Form 4 filed January 6, 2025.

F2: Represents a broker-assisted sale to satisfy the Reporting Person's tax withholding obligations in connection with the vesting of restricted stock units.

F3: The price reported reflects the weighted average sales price. These shares were sold in multiple transactions at prices that were not available from the broker at the time of filing. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price.

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.