X0306 4 2020-06-18 0 0001656634 Gritstone Oncology, Inc. GRTS 0001754286 Li Judith C/O GRITSTONE ONCOLOGY, INC. 5959 HORTON STREET, SUITE 300 EMERYVILLE CA 94608 1 0 0 0 Stock Option (Right to Buy) 6.66 2020-06-18 4 A 0 12500 0 A 2030-06-18 Common Stock 12500 12500 D The option will vest and become exercisable on the earlier of the first anniversary of the date of grant or the date of the next annual stockholder's meeting to the extent unvested as of such date, subject to continued service through the applicable vesting date. /s/ Rahsaan Thompson, Attorney-in-Fact for Judith Li 2020-06-22