X0407 4 2023-06-07 0001676725 IDEAYA Biosciences, Inc. IDYA 0001645330 MACKEY CATHERINE J C/O IDEAYA BIOSCIENCES, INC. 7000 SHORELINE COURT, SUITE 350 SOUTH SAN FRANCISCO CA 94080 true false Stock Option (right to buy) 25.4 2023-06-07 4 A 0 16200 0 A 2033-06-06 Common Stock 16200 16200 D 100% of the shares subject to the option shall vest in full on the earlier of (i) the first anniversary of the date of grant and (ii) immediately prior to the Annual Meeting following the date of grant, subject to the Reporting Person continuing in service on the Board through such vesting date. /s/ Jason Throne, as Attorney-in-Fact for Catherine J. Mackey 2023-06-09