Form 4 Filing for IDEAYA Biosciences, Inc. - Insider Transaction

This filing details a Form 4 filed by Jeffrey Stein, a director at IDEAYA Biosciences, Inc. (IDYA). On June 16, 2026, Mr. Stein was granted 20,000 stock options to purchase common stock. The options have an exercise price of $30.57 and are exercisable until June 16, 2036. Vesting is set to occur 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 Mr. Stein continues his service on the Board. The transaction is reported as direct ownership, with acquisition code 'A'. Following this transaction, Mr. Stein holds 20,000 shares subject to the option. The filing was signed by Andres Ruiz Briseno as Attorney-in-Fact for Jeffrey Stein on June 18, 2026.