X0407 4 2023-06-07 0 0001836056 Ambrx Biopharma Inc. AMAM 0001866837 Chang Xiaowei C/O AMBRX BIOPHARMA INC. 10975 NORTH TORREY PINES ROAD LA JOLLA CA 92037 1 0 0 0 0 Cash-Settled RSU's 2023-06-07 4 A 0 85000 0.00 D Ordinary Shares 85000 85000 D Cash-Settled RSU's 2023-06-07 4 A 0 125000 0.00 D Ordinary Shares 125000 125000 D Represents grant of Restricted Stock Units (the "RSUs") payable solely in cash based on the market price of the underlying Ordinary Shares on the vesting date (the reporting person will never receive the Ordinary Shares). The RSUs vest on the earlier of (i) the one year anniversary of the date of grant and (ii) the day before the next annual general meeting. The RSUs vest in three (3) successive equal annual installments following June 8, 2023. /s/ Sonja Nelson, Attorney-in-Fact for Xiaowei Chang 2023-06-09