Martin Marietta Announces First-Quarter 2023 Earnings Conference Call

Martin Marietta Materials, Inc. (NYSE:MLM) (“Martin Marietta” or the “Company”) will host its first-quarter 2023 earnings conference call on Thursday, May 4, 2023 at 10:00 a.m. Eastern Time. The Company will release results for the quarter ended March 31, 2023, that morning before the market opens.

A live, listen-only webcast and supplemental information will be accessible on the Investors section of the Company’s website at www.martinmarietta.com. The conference call may also be accessed by registering here: https://register.vevent.com/register/BIb6c48e41f5e245918d553366714c7fa1. Please register at least 15 minutes in advance to ensure a timely connection to the call. An on-demand replay will be available on the Company’s website approximately two hours following the conclusion of the live broadcast and will be available for one year.

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 28 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.

Investor Contact: Jennifer ParkVice President, Investor Relations (919) [e-mail]

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