MLM Martin Marietta Materials Inc

Martin Marietta Materials, Inc. (NYSE:MLM) today announced that it will provide an online Web simulcast of its second quarter 2014 earnings conference call on Tuesday, July 29, 2014. The Company will release results for the second quarter and six months ended June 30, 2014, 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 July 29, 2014. 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 74894672. A five-day telephonic replay will be available by dialing 404-537-3406 and entering 74894672 when prompted for the access code.

Martin Marietta, an American company and a member of the S&P 500 Index, is a leading supplier of aggregates and heavy building materials, with operations spanning 36 states, Canada and the Caribbean, and dedicated teams transforming more than 100 years of irreplaceable natural resources into 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. MLM-E

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