IDEAYA Biosciences, Inc. - Officer/Director Stock Option Grant

On June 16, 2026, TERRY J ROSEN, a director at IDEAYA Biosciences, Inc., was granted a stock option to purchase 20,000 shares of Common Stock at an exercise price of $30.57 per share. The option vests in full on the earlier of June 16, 2027, or immediately prior to the Annual Meeting following the grant date, provided Mr. Rosen continues to serve on the Board through the vesting date. This transaction is reported on Form 4.