Martin Marietta Materials, Inc. to Present at SouthEast Invest Conference

RALEIGH, North Carolina, (March 31, 2006) -- Martin Marietta Materials, Inc. (NYSE: MLM), today announced that Anne H. Lloyd, Senior Vice President, Chief Financial Officer and Treasurer, will present at the SouthEast Invest Conference at the Washington Duke Inn on Thursday, April 6th. The Corporation's presentation will begin at approximately 8:30 a.m. Eastern Time.

A live audio webcast of the presentation will be accessible through the Corporation's website at http://www.martinmarietta.com.

Martin Marietta is the nation's second largest producer of construction aggregates, a leading producer of magnesia-based chemical products and is developing structural composites products for use in a wide variety of industries.