Martin Marietta Materials, Inc. (NYSE:MLM) today announced that it will provide an online Web simulcast of its first quarter 2011 earnings conference call on Tuesday, May 3, 2011. The Company will release results for the first quarter ended March 31, 2011, that morning before the market opens.

The live broadcast of Martin Marietta Materials’ conference call will begin at 2:00 p.m. Eastern Time on May 3, 2011. 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 970-315-0423, confirmation number 61456607. A seven-day telephonic replay will be available by dialing 706-645-9291 and entering 61456607 when prompted for the access code.

Martin Marietta Materials is the nation’s second largest 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 website at www.martinmarietta.com.

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