X0407 4 2023-05-18 0 0001836056 Ambrx Biopharma Inc. AMAM 0001304406 Glover Stephen C. C/O AMBRX BIOPHARMA INC., 10975 TORREY PINES ROAD LA JOLLA CA 92037 1 0 0 0 0 Stock Option (right to buy) 1.97 2023-05-18 4 A 0 210000 0.00 A 2033-05-18 Ordinary Shares 210000 210000 D 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 Issuer's American Depositary Shares ("ADSs"). The Ordinary Shares subject to the option vest in thirty-six (36) equal monthly installments following May 19, 2023. The Ordinary Shares of the Issuer may be represented by ADSs. Each ADS represents seven (7) Ordinary Shares of the Issuer. /s/ Sonja Nelson, Attorney-in-Fact for Stephen Glover 2023-05-26