Company to Broadcast Third Quarter 2017 Earnings Conference Call Live on the Internet

Call will begin at 11:00 a.m. ET on November 2, 2017

Martin Marietta Materials, Inc. (NYSE:MLM) today announced that it will provide an online Web simulcast of its third quarter 2017 earnings conference call on Thursday, November 2, 2017. The Company will release results for the third quarter ended September 30, 2017, that morning before the market opens.

The live broadcast of Martin Marietta Materials' conference call will begin at 11:00 a.m. Eastern Time on November 2, 2017. An online replay of the live broadcast 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 at http://ir.martinmarietta.com/events.cfm.

For those investors without online web access, the conference call may also be accessed by calling 970‑315‑0423, confirmation number 2189214. A five-day telephonic replay will be available by dialing 404‑537‑3406 and entering 2189214 when prompted for the access code.

Martin Marietta, a member of the S&P 500 Index, is an American-based company and a leading supplier of building materials, including aggregates, cement, ready mixed concrete, and asphalt. Through a network of operations spanning 26 states, Canada, and The Bahamas, dedicated Martin Marietta teams supply the resources necessary for building the solid foundations on which our communities thrive. 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.

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