X0306 4 2022-09-28 0 0001786205 Arcellx, Inc. ACLX 0001789632 Heery Christopher C/O ARCELLX, INC. 25 WEST WATKINS MILL ROAD, SUITE A GAITHERSBURG MD 20878 0 1 0 0 Chief Medical Officer Stock Option (right to buy) 19.97 2022-09-28 4 A 0 40000 0.00 A 2032-09-28 Common Stock 40000 40000 D 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 forty-eighth (1/48th) of the shares subject to the option will vest each month following the Vesting Start Date on the same day of the month as the Vesting Start Date (or, if there is no corresponding day in a particular month, then the last day of the month) over four (4) years. "Vesting Start Date" shall mean January 1, 2023. Exhibit 24 - Power of Attorney /s/ Michelle Gilson, as Attorney-in-Fact 2022-09-30