Arcellx, Inc. — Director's Dealing 2026

Feb 19, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Arcellx, Inc. (ACLX)
CIK: 0001786205
Period of Report: 2026-02-19

Reporting Person: Gilson Michelle (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-01-03	Common Stock	M	15340	—	Acquired	44302	Direct
2026-02-19	Common Stock	S	2879	$67.7301	Disposed	50662	Direct
2026-02-19	Common Stock	S	5405	$68.5726	Disposed	45257	Direct
2026-02-19	Common Stock	S	100	$69.38	Disposed	45157	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 3, 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 2,879 shares sold in the price range of $67.09 to $68.08 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 5,405 shares sold in the price range of $68.17 to $69.04 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.