MLM Martin Marietta Materials Inc

Martin Marietta Materials, Inc. (NYSE: MLM) (“Martin Marietta” or the “Company”) today announced that it completed the acquisition of Albert Frei & Sons, Inc. (“AFS”), a leading aggregates producer in Colorado. The transaction, which closed on January 12, 2024, provides more than 60 years of high-quality, hard rock reserves to better serve new and existing customers.

Ward Nye, Chairman, President and CEO of Martin Marietta stated, “We are delighted to announce the acquisition of AFS and welcome such a talented team to our company. The acquisition, wholly consistent with our strategic plan, enhances our aggregates platform in the high-growth, Denver metropolitan area and strengthens our ability to deliver significant value for shareholders and customers. We expect this transaction to be immediately accretive to earnings, margins and cash flow as we redeploy proceeds from prior divestitures.”

About Martin Marietta

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 for building the solid foundations on which our communities thrive. Martin Marietta’s Magnesia Specialties business produces high-purity magnesia and dolomitic lime products used worldwide in environmental, industrial, agricultural and specialty applications. For more information, visit www.martinmarietta.com or www.magnesiaspecialties.com.

Investor Contact: Jacklyn RookerDirector, Investor Relations (919) 510-4736Jacklyn.Rooker@martinmarietta.com

MLM-G

This release contains statements which constitute forward-looking statements within the meaning of federal securities law. Statements and assumptions on future revenues, income and cash flows, performance, economic trends, the outcome of litigation, regulatory compliance and environmental remediation cost estimates are examples of forward-looking statements. Numerous factors could affect the Company’s forward-looking statements and actual performance.

Investors are cautioned that all forward-looking statements involve risks and uncertainties, and are based on assumptions that the Company believes in good faith are reasonable at the time the statements are made, but which may be materially different from actual results. Investors can identify these statements by the fact that they do not relate only to historic or current facts. The words “may”, “will”, “could”, “should”, “anticipate”, “believe”, “estimate”, “expect”, “forecast”, “intend”, “outlook”, “plan”, “project”, “scheduled” and other words of similar meaning in connection with future events or future operating or financial performance are intended to identify forward-looking statements. Any or all of Martin Marietta’s forward-looking statements in this release and in other publications may turn out to be wrong.

You should consider these forward-looking statements in light of risk factors discussed in Martin Marietta’s Annual Report on Form 10-K for the year ended December 31, 2022, Martin Marietta’s Quarterly Reports on Form 10-Q for the quarters ended March 31, 2023, June 30, 2023, and September 30, 2023, and other periodic filings made with the SEC. All of the Company’s forward-looking statements should be considered in light of these factors. In addition, other risks and uncertainties not presently known to the Company or that it considers immaterial could affect the accuracy of its forward-looking statements, or adversely affect or be material to the Company. Except as required by law, the Company undertakes no obligation to update any forward-looking statements in order to reflect any event or circumstance that may arise after the date of this release.