Michelle Gilson - 23 May 2025 Form 4 Insider Report for Arcellx, Inc. (ACLX)

Role
CHIEF FINANCIAL OFFICER
Signature
/s/ Michelle Gilson
Issuer symbol
ACLX
Transactions as of
23 May 2025
Net transactions value
-$784,777
Form type
4
Filing time
28 May 2025, 20:18:05 UTC
Previous filing
10 Jan 2025
Next filing
06 Oct 2025
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 28 May 2025 0001930862

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ACLX Common Stock Options Exercise $0 +22,429 +234% $0.000000 32,011 23 May 2025 Direct F1
transaction ACLX Common Stock Sale $240,868 -3,786 -12% $63.62 28,225 27 May 2025 Direct F2, F3
transaction ACLX Common Stock Sale $543,909 -8,449 -30% $64.38 19,776 27 May 2025 Direct F2, F4

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction ACLX Restricted Stock Units Options Exercise $0 -22,429 -100% $0.000000 0 23 May 2025 Common Stock 22,429 Direct F1, F5
* 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.
F2 Represents the number of shares sold to cover the tax withholding obligations in connection with the vesting of RSUs and does not represent a discretionary sale by the Reporting Person.
F3 Represents the weighted average share price of an aggregate total of 3,786 shares sold in the price range of $62.935 to $63.925 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 8,449 shares sold in the price range of $63.925 to $ 64.785 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.
F5 Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, the RSUs shall vest annually over three (3) years with a cliff every twelve (12) months on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month). "Vesting Commencement Date" shall mean May 23, 2022.