On September 21, 2023, Paul A. Stone informed IDEAYA Biosciences, Inc., of his voluntary resignation from his position as Chief Financial Officer of the Company. Mr. Stone?s resignation will be effective as of November 10, 2023, which the Company expects to be after the completion of the filing of the Company?s Form 10-Q for the third quarter. Mr. Stone resigned to pursue other business opportunities and his resignation is not related to any disagreement with the Company on any matter relating to the Company?s operations, policies or practices.