X0407 4 2023-04-28 0 0001836056 Ambrx Biopharma Inc. AMAM 0001976455 Aromando Andrew C/O AMBRX BIOPHARMA INC., 10975 TORREY PINES ROAD LA JOLLA CA 92037 0 1 0 0 Chief Operating Officer 0 Stock Option (right to buy) 1.38 2023-04-28 4 A 0 2600000 0.00 A 2033-04-28 Ordinary Shares 2600000 2600000 D The options will have an exercise price per share 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"). Grant awarded as an inducement grant in connection with the Reporting Person's appointment as Chief Operating Officer of the Issuer. Twenty-five percent of the Ordinary Shares subject to the option vested on April 28, 2024, and the remainder vests in thirty-six equal monthly installments following such date. The Ordinary Shares of the Issuer may be represented by ADSs. Each ADS represents seven Ordinary Shares of the Issuer. /s/ Sonja Nelson, Attorney-in-Fact for Andrew Aromando 2023-05-05