Christopher Heery - 30 Sep 2025 Form 4 Insider Report for Arcellx, Inc. (ACLX)

Role
CHIEF MEDICAL OFFICER
Signature
Michelle Gilson
Issuer symbol
ACLX
Transactions as of
30 Sep 2025
Net transactions value
-$1,709,723
Form type
4
Filing time
30 Sep 2025, 20:16:38 UTC
Previous filing
29 Sep 2025
Next filing
17 Nov 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Heery Christopher CHIEF MEDICAL OFFICER C/O ARCELLX, INC., 800 BRIDGE PARKWAY, REDWOOD CITY Michelle Gilson 30 Sep 2025 0001789632

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ACLX Common Stock Sale $426,925 -5,300 -24% $80.55 16,358 30 Sep 2025 Direct F1, F2
transaction ACLX Common Stock Sale $1,157,035 -14,204 -87% $81.46 2,154 30 Sep 2025 Direct F1, F3
transaction ACLX Common Stock Sale $125,763 -1,530 -71% $82.20 624 30 Sep 2025 Direct F1, F4
* 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.
F2 Represents the weighted average share price of an aggregate total of 5,300 shares sold in the price range of $80.00 to $80.90 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.
F3 Represents the weighted average share price of an aggregate total of 14,204 shares sold in the price range of $81.08 to $82.07 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 1,530 shares sold in the price range of $82.09 to $82.33 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.