Christopher Heery - 17 Nov 2025 Form 4 Insider Report for Arcellx, Inc. (ACLX)

Signature
/s/ Michelle Gilson, as Attorney-in-Fact
Issuer symbol
ACLX
Transactions as of
17 Nov 2025
Transactions value $
-$30,600
Form type
4
Filing time
17 Nov 2025, 19:15:51 UTC
Previous filing
30 Sep 2025

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Heery Christopher CHIEF MEDICAL OFFICER C/O ARCELLX, INC., 800 BRIDGE PARKWAY, REDWOOD CITY /s/ Michelle Gilson, as Attorney-in-Fact 17 Nov 2025 0001789632

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ACLX Common Stock Sale -$30.6K -340 -54.49% $90.00 284 17 Nov 2025 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 The sale of shares reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan entered into by the Reporting Person on March 23, 2025.