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Press Release

Martin Marietta Materials, Inc. Declares Regular Cash Dividend

May 22, 2015

RALEIGH, N.C.--(BUSINESS WIRE)-- Anne H. Lloyd, Executive Vice President and Chief Financial Officer of Martin Marietta Materials, Inc. (NYSE:MLM), today announced that the Board of Directors has declared a regular quarterly cash dividend of $0.40 (forty cents) per share on the Corporation's common stock. This dividend, which represents a cash dividend of $1.60 per share on an annualized basis, is payable June 30, 2015, to shareholders of record at the close of business on June 1, 2015.

Martin Marietta, an American-based company and a member of the S&P 500 Index, is a leading supplier of aggregates and heavy building materials, with operations spanning 32 states, Canada and the Caribbean. Dedicated teams at Martin Marietta supply the resources for the roads, sidewalks and foundations on which we live. Martin Marietta's Magnesia Specialties business provides a full range of magnesium oxide, magnesium hydroxide and dolomitic lime products. For more information, visit www.martinmarietta.com or www.magnesiaspecialties.com.

MLM-D

Martin Marietta Materials, Inc.
Anne H. Lloyd, 919-783-4660
Executive Vice President and Chief
Financial Officer
www.martinmarietta.com

Source: Martin Marietta Materials, Inc.

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