X0407 4 2023-03-22 0001501989 CytomX Therapeutics, Inc. CTMX 0001970752 BELVIN MARCIA C/O CYTOMX THERAPEUTICS, INC. 151 OYSTER POINT BLVD., STE. 400 SOUTH SAN FRANCISCO CA 94080 true SVP, Chief Scientific Officer false Common Stock 2023-03-22 4 A 0 60000 0 A 140820 D Constitute restricted stock units ("RSUs") for which the Reporting Person is entitled to receive one (1) share of Common Stock for each RSU upon vesting. 1/4th of the RSUs vest annually on March 15 of each year, with the first 1/4th vesting on March 15, 2024, subject to the Reporting Person continuing as a service provider through each such date. Includes 116,875 RSUs. /s/ Lloyd Rowland, as Attorney-in-Fact for Marcia Belvin 2023-03-29