Catherine J. Mackey Stock Option Grant

Catherine J. Mackey, a director at IDEAYA Biosciences, Inc. (IDYA), was granted 20,000 stock options on June 16, 2026. These options have an exercise price of $30.57 and are set to expire on June 16, 2036. The options vest in full on the earlier of the first anniversary of the grant date or immediately prior to the Annual Meeting following the grant date, provided Ms. Mackey continues her service on the Board through the vesting date. The transaction, reported on Form 4, indicates the acquisition of these options, with a post-transaction ownership of 20,000 shares underlying the option. The filing was signed by Andres Ruiz Briseno as Attorney-in-Fact for Ms. Mackey.