On December 22, 2022, Martin Marietta Materials, Inc. entered into a Loan Modification No. 1 and Extension Agreement 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, (i) extend the maturity date of the loans advanced under the Credit Agreement to December 21, 2027, and (ii) replace the London InterBank Offered Rate “LIBOR” with the Secured Overnight Financing Rate “SOFR” as the interest rate benchmark.