X0206 3 2018-06-13 0 0001501989 CytomX Therapeutics, Inc. CTMX 0001236395 ROWLAND LLOYD A C/O CYTOMX THERAPEUTICS, INC. 151 OYSTER POINT BOULEVARD, SUITE 400 SOUTH SAN FRANCISCO CA 94080 0 1 0 0 General Counsel Stock Option (right to buy) 25.67 2028-05-30 Common Stock 100000 D The shares subject to the option will vest and become exercisable as to 25% of the total number of shares subject to the option on May 21, 2019 and with respect to 1/48th of the total number of shares subject to the option in successive, equal monthly installments on each monthly anniversary thereafter, subject to the Reporting Person's continued employment with the Issuer on each such vesting date. /s/ Lloyd Rowland 2018-06-15