Michelle Gilson - 19 Feb 2026 Form 4 Insider Report for Arcellx, Inc. (ACLX)

Role
CHIEF FINANCIAL OFFICER
Signature
/s/ Michelle Gilson
Issuer symbol
ACLX
Transactions as of
19 Feb 2026
Net transactions value
-$572,568
Form type
4
Filing time
19 Feb 2026, 18:26:34 UTC
Previous filing
18 Feb 2026
Next filing
25 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Gilson Michelle CHIEF FINANCIAL OFFICER C/O ARCELLX, INC., 800 BRIDGE PARKWAY, REDWOOD CITY /s/ Michelle Gilson 19 Feb 2026 0001930862

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ACLX Common Stock Options Exercise $0 +15,340 +53% $0.000000 44,302 03 Jan 2026 Direct F1
transaction ACLX Common Stock Sale $194,995 -2,879 -5.4% $67.73 50,662 19 Feb 2026 Direct F2, F3
transaction ACLX Common Stock Sale $370,635 -5,405 -11% $68.57 45,257 19 Feb 2026 Direct F2, F4
transaction ACLX Common Stock Sale $6,938 -100 -0.22% $69.38 45,157 19 Feb 2026 Direct F2
* 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. 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.