Arcellx, Inc. — Director's Dealing 2026

Feb 18, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Arcellx, Inc. (ACLX)
CIK: 0001786205
Period of Report: 2026-02-17

Reporting Person: Gilson Michelle (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-01-02	Common Stock	M	20496	—	Acquired	28962	Direct
2026-02-17	Common Stock	S	7141	$69.2103	Disposed	57691	Direct
2026-02-17	Common Stock	S	4150	$70.0125	Disposed	53541	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 2, 2026.

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: Represents the weighted average share price of an aggregate total of 7,141 shares sold in the price range of $68.69 to $69.68 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: Represents the weighted average share price of an aggregate total of 4,150 shares sold in the price range of $69.69 to $70.55 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.