On January 24, 2012, Martin Marietta Materials, Inc. filed a revised preliminary proxy statement with respect to its proposal to nominate 5 independent candidates for election to the Board of Directors of Vulcan Materials Company. Martin Marietta is filing this amendment no. 1 to its preliminary proxy statement to update the preliminary proxy statement to reflect the substitution of J. Keith Matheney instead of Edward A. Blechschmidt. Blechschmidt has notified Martin Marietta that he would be unable to serve as a director of Vulcan due to other commitments. In addition, Martin Marietta urged the shareholders of the Company vote for its proxy card.