X0407 4 2023-06-07 0 0001836056 Ambrx Biopharma Inc. AMAM 0001182615 MAIER PAUL V 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 The Ordinary Shares of the Issuer may be represented by 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. /s/ Sonja Nelson, Attorney-in-Fact for Paul V. Maier 2023-06-09