MARTIN MARIETTA MATERIALS INC

Item 1.01 Entry into a Material Definitive Agreement On August 18, 2026, Martin Marietta Materials, Inc. (the “Corporation”) entered into a Credit Agreement with JPMorgan Chase Bank, N.A. (“JPMCB”), as administrative agent, and the lenders and issuing lenders party thereto (the “Credit Agreement”), which provides for a $1,500,000,000 five-year senior unsecured revolving facility (the “Revolving Facility”). Borrowings under the Revolving Facility bear interest, at the Corporation’s option, at rates based upon Term SOFR or a base rate, plus, for each rate, a margin determined in accordance with a ratings-based pricing grid. The Revolving Facility replaces the Corporation’s existing Credit Agreement, dated as of December 21, 2021, with JPMCB, as administrative agent, and the lenders and issuing lenders party thereto (as amended, restated, amended and restated, supplemented or otherwise modified from time to time, the “Existing Credit Agreement”). The Existing Credit Agreement had provided for a revolving facility, under which no borrowings were outstanding prior to entering into the Revolving Facility. The Revolving Facility expires on August 18, 2031, with any outstanding principal amounts, together with interest accrued thereon, due in full on that date. The Credit Agreement requires that the Corporation maintain a maximum Leverage Ratio (as defined in the Credit Agreement) not to exceed 3.75:1.00, provided that following the closing date of the Corporation’s previously announced acquisition of Lhoist North America, Inc. (the “Acquisition”), the Corporation’s Leverage Ratio may not exceed (a) for the first three fiscal quarters ending after the Acquisition, 4.75:1.00, (b) for the next succeeding three fiscal quarters, 4.25:1.00 and (c) thereafter, 3.75:1.00, provided further that the Corporation may exclude from the Leverage Ratio debt incurred in connection with certain acquisitions for a period of four quarters so long as the Leverage Ratio calculated without such exclusion does not exceed 4.25:1.00. Additionally, if there are no amounts outstanding under both the Revolving Facility and the Corporation’s accounts receivable securitization facility, consolidated debt will be reduced for purposes of the calculation of the Leverage Ratio by the Corporation’s cash and cash equivalents, such reduction not to exceed $500,000,000. The Credit Agreement is filed as Exhibit 10.1 hereto and is incorporated herein by reference, and the description of the Credit Agreement contained herein is qualified in its entirety by the terms of the Credit Agreement.

Item 1.02 Termination of a Material Definitive Agreement The information required by Item 1.02 is included under Item 1.01 “Entry into a Material Definitive Agreement” and that information is incorporated herein by reference.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant The information required by Item 2.03 is included under Item 1.01 “Entry into a Material Definitive Agreement” and that information is incorporated herein by reference.