MLM: Material agreement · New financial obligation · Other company developments

Item 1.01. Entry into a Material Definitive Agreement. Information set forth under Item 2.03 of this Current Report on Form 8-K 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. On August 14, 2026, Martin Marietta Materials, Inc. (“Martin Marietta”) issued $750 million aggregate principal amount of 4.850% Senior Notes due 2029 (the “2029 Notes”), $1,250 million aggregate principal amount of 5.200% Senior Notes due 2032 (the “2032 Notes”), $1,000 million aggregate principal amount of 5.400% Senior Notes due 2034 (the “2034 Notes”), $1,500 million aggregate principal amount of 5.625% Senior Notes due 2036 (the “2036 Notes”) and $1,000 million aggregate principal amount of 6.375% Senior Notes due 2056 (the “2056 Notes” and, together with the 2029 Notes, 2032 Notes, 2034 Notes and 2036 Notes, the “Notes”) pursuant to a base indenture, dated as of May 22, 2017 (the “Base Indenture”), as amended and supplemented from time to time, including by the Sixth Supplemental Indenture, dated as of August 14, 2026 (the “Sixth Supplemental Indenture” and, together with the Base Indenture, the “Indenture”) between Martin Marietta and Regions Bank, as trustee (the “Trustee”), governing the Notes. The 2029 Notes will mature on August 15, 2029 and will accrue interest at a rate of 4.850% per annum. The 2032 Notes will mature on January 30, 2032 and will accrue interest at a rate of 5.200% per annum. The 2034 Notes will mature on January 30, 2034 and will accrue interest at a rate of 5.400% per annum. The 2036 Notes will mature on August 15, 2036 and will accrue interest at a rate of 5.625% per annum. The 2056 Notes will mature on August 15, 2056 and will accrue interest at a rate