RALEIGH, N.C., April 23, 2015 (GLOBE NEWSWIRE) -- Martin Marietta Materials, Inc. (NYSE:MLM) today announced that it will provide an online Web simulcast of its first quarter 2015 earnings conference call on Thursday, April 30, 2015. The Company will release results for the first quarter ended March 31, 2015, 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 April 30, 2015.  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 25543184.  A five-day telephonic replay will be available by dialing 404-537-3406 and entering 25543184 when prompted for the access code.

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.

CONTACT: Anne Lloyd         Executive Vice President and Chief Financial Officer         (919) 783-4660         www.martinmarietta.com

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