X0306 4/A 2020-01-02 2020-01-06 0 0001061983 CYTOKINETICS INC CYTK 0001522780 Kaye Edward M. MD 280 EAST GRAND AVENUE SOUTH SAN FRANCISCO CA 94080 1 0 0 0 Non-Qualified Stock Option (right to buy) 10.55 2020-01-02 4 A 0 9479 10.55 A 2030-01-02 Common Stock 9479 9479 D This option shall vest and become exercisable in 12 equal monthly installments and shall become fully vested on January 2, 2021. This Form 4/A is being filed to report the correct number of shares underlying the stock option, which was granted to the reporting person in connection with his election to receive 100% of his non-employee director retainer in equity, pursuant to the methodology described in the Company's most recent Proxy Statement. The number of shares reported on the Form 4 filed January 6, 2020 was incorrect due to an administrative error. By: Robert Wong For: Edward Kaye, M.D 2020-01-29