MLM: Material agreement · New financial obligation

Item 1.01 Entry into a Material Definitive Agreement Amendment No. 1 to Credit Agreement On July 10, 2026, Martin Marietta Materials, Inc. (the “Corporation”) entered into Amendment No. 1 (the “Amendment”) with JPMorgan Chase Bank, N.A. (“JPMCB”) and certain financial institutions, as lenders, to the Corporation’s $800,000,000 five-year senior unsecured revolving credit facility with JPMCB, as administrative agent, and the lenders and issuing lenders party thereto (the “Revolving Credit Agreement”, and the facility thereunder, the “Revolving Facility”). The Amendment amends the Revolving Credit Agreement to modify the financial covenant contained therein to provide that if the Corporation’s previously announced acquisition of Lhoist North America, Inc. (the “Acquisition”) is consummated, then the maximum Leverage Ratio (as defined in the Revolving Credit Agreement) shall not exceed (a) for the first three fiscal quarters ending after the closing date of 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. The full text of the Amendment is filed as Exhibit 10.1 hereto and is incorporated herein by reference. The description of the Amendment and Revolving Credit Agreement contained herein are qualified in their entirety by the terms of the Amendment and the Revolving Credit Agreement. Term Credit Agreement On July 15, 2026, the Corporation entered into a Term Credit Agreement (the “Term Credit Agreement”) with JPMCB, as administrative agent, and certain financial institutions, as lenders, pursuant to which such lenders committed to provide, subject to the consummation of the Acquisition and other customary conditions, a three-year senior unsecured term loan facility in an aggregate principal amount of $1,5