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

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

RALEIGH, N.C., Oct. 25, 2011 (GLOBE NEWSWIRE) -- Martin Marietta Materials, Inc.
(NYSE:MLM) today announced that it will provide an online Web simulcast of its
third quarter 2011 earnings conference call on Tuesday, November 1, 2011. The
Company will release results for the third quarter ended September 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 November 1, 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 20607264.A seven-day
telephonic replay will be available by dialing 404-537-3406 and entering
20607264 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.

MLM-G

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