Martin Marietta Materials, Inc. To Broadcast Year-End Conference Call Live on the Internet

RALEIGH, North Carolina (January 27, 2006) - Martin Marietta Materials, Inc. (NYSE:MLM) today announced that it will provide an online Web simulcast of its year-end 2005 earnings conference, call on Thursday, February 9, 2006. The Company will release results for the fourth quarter and year ended December 31, 2005, that morning before the market opens.

The live broadcast of Martin Marietta Materials' conference call will begin at 2 p.m. Eastern Time on February 9, 2006. An online replay will be available approximately two hours following the conclusion of the live broadcast and will continue for one year. A link to these events is available at the Company's website: www.martinmarietta.com.

For those investors without online web access, the conference call may also be accessed by calling 913-981-5509, confirmation number 7326410.

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.