Rami Elghandour - 02 Jan 2026 Form 4 Insider Report for Arcellx, Inc. (ACLX)

Role
Officer, Director
Signature
/s/ Michelle Gilson, as Attorney-in-Fact
Issuer symbol
ACLX
Transactions as of
02 Jan 2026
Net transactions value
$0
Form type
4
Filing time
06 Jan 2026, 20:15:02 UTC
Previous filing
29 Aug 2025
Next filing
13 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Elghandour Rami Officer, Director C/O ARCELLX, INC, 800 BRIDGE PARKWAY, REDWOOD CITY /s/ Michelle Gilson, as Attorney-in-Fact 06 Jan 2026 0001613689

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ACLX Common Stock Options Exercise $0 +55,459 +9% $0.000000 673,378 02 Jan 2026 Direct
transaction ACLX Common Stock Options Exercise $0 +53,098 +7.9% $0.000000 726,476 03 Jan 2026 Direct
transaction ACLX Common Stock Options Exercise $0 +55,991 +7.7% $0.000000 782,467 06 Jan 2026 Direct

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 Unit Award $0 +208,333 $0.000000 208,333 02 Jan 2026 Common Stock 208,333 Direct F1, F2
transaction ACLX Restricted Stock Unit Options Exercise $0 -55,459 -50% $0.000000 55,459 02 Jan 2026 Common Stock 55,459 Direct F1, F3
transaction ACLX Restricted Stock Unit Options Exercise $0 -53,098 -100% $0.000000 0 03 Jan 2026 Common Stock 53,098 Direct F1, F4
transaction ACLX Restricted Stock Unit Options Exercise $0 -55,991 -25% $0.000000 167,973 06 Jan 2026 Common Stock 55,991 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 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, one-fourth (1/4th) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over four (4) years. "RSU Grant Date" shall mean January 2, 2026.
F3 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, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. "RSU Grant Date" shall mean January 2, 2024.
F4 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, one-third (1/3rd) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over three (3) years. "RSU Grant Date" shall mean January 3, 2023.
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, one-fourth (1/4th) of the RSUs subject to the award will vest each year following the RSU Grant Date on the same day of the month as the RSU Grant Date (or, if there is no corresponding day in a particular month, then the last day of the month) over four (4) years. "RSU Grant Date" shall mean January 6, 2025.