RALEIGH, N.C., May 29, 2008 (BUSINESS WIRE) -- Anne H. Lloyd, Senior Vice President, Chief Financial Officer and Treasurer of Martin Marietta Materials, Inc. (NYSE:MLM), today announced that the Board of Directors has declared a regular quarterly cash dividend of $0.345 (thirty-four and one-half cents) per share on the Corporation's common stock. This dividend, which represents a cash dividend of $1.38 per share on an annualized basis, is payable June 30, 2008, to shareholders of record at the close of business on June 3, 2008.

Martin Marietta Materials is a leading producer of construction aggregates and a producer of magnesia-based chemicals and dolomitic lime. For more information about Martin Marietta Materials, refer to the Corporation's Web site at www.martinmarietta.com.

MLM-D

SOURCE: Martin Marietta Materials, Inc.

Martin Marietta 
Materials, Inc.
Anne Lloyd, 919-783-4658
Senior Vice President, Chief Financial
Officer and Treasurer
www.martinmarietta.com

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