On February 24, 2017, at a meeting of the Board of Directors of Martin Marietta Materials, Inc., William E. McDonald informed the Corporation that, in accordance with the Corporation's Bylaws and Corporate Governance Guidelines that require retirement from the Board of Directors at the annual meeting following a director reaching the age of 75, he will be retiring as a director, and accordingly tendered his resignation as a director, effective as of the commencement of the 2017 annual meeting of shareholders of the Corporation.