Item 1.01 Entry into a Material Definitive Agreement

On December 19, 2025, Martin Marietta Materials, Inc. (the "Corporation") entered into a Loan Modification No. 4 and Extension Agreement (the "Amendment") with JPMorgan Chase Bank, N.A. ("JPMCB") and the Lenders (as defined in the Amendment) to the Corporation's $800,000,000 five-year senior unsecured revolving credit facility with JPMCB, as administrative agent, Deutsche Bank Securities Inc., PNC Bank, National Association, Truist Bank and Wells Fargo Bank, National Association, as co-syndication agents and the lenders party thereto (the "Credit Agreement").

The Amendment amends the Credit Agreement to, among other things, extend the maturity date of the loans advanced under the Credit Agreement to December 21, 2030.

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 Credit Agreement contained herein are qualified in their entirety by the terms of the Amendment and the Credit Agreement.

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.