X0407 4 2023-05-18 0 0001836056 Ambrx Biopharma Inc. AMAM 0001304406 Glover Stephen C. C/O AMBRX BIOPHARMA INC., 10975 NORTH TORREY PINES ROAD LA JOLLA CA 92037 1 0 0 0 0 Ordinary Shares 2023-06-07 4 A 0 85000 0.00 A 85000 D Stock Option (right to buy) 1.96 2023-06-07 4 A 0 40000 0.00 A 2033-06-07 Ordinary Shares 40000 40000 D Stock Option (right to buy) 1.97 2023-05-18 4 A 0 17500 0.00 A 2033-05-18 Ordinary Shares 17500 17500 D The Ordinary Shares of the Issuer may be represented by the Issuer's American Depositary Shares ("ADSs"). Each ADS represents seven (7) Ordinary Shares of the Issuer. Represents grant of Restricted Stock Units (the "RSUs") payable solely in Ordinary Shares of the Issuer that vest as follows: 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 exercise price of the options is equal to the fair market value per ordinary share on the grant date based on the trading price of the ADS. The options vest on June 7, 2024. The options vested on June 6, 2023. /s/ Sonja Nelson, Attorney-in-Fact for Stephen Glover 2023-06-09