Martin Marietta Materials, Inc. to Broadcast Second Quarter Conference Call Live...

Martin Marietta Materials, Inc. to Broadcast Second Quarter Conference Call Live
on the Internet

RALEIGH, N.C., July 26, 2011 (GLOBE NEWSWIRE) -- Martin Marietta Materials, Inc.
(NYSE:MLM) today announced that it will provide an online Web simulcast of its
second quarter 2011 earnings conference call on Tuesday, August 2, 2011. The
Company will release results for the second quarter ended June 30, 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 August 2, 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 84273355.A seven-day
telephonic replay will be available by dialing 404-537-3406 and entering
84273355 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.

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