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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - K ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-12744 MARTIN MARIETTA MATERIALS , INC . ( Exact name of registrant as specified in its charter ) North Carolina ( State or other jurisdiction of incorporation or organization ) 2710 Wycliff Road , Raleigh , North Carolina ( Address of principal executive offices ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock ( par value $ .01 per share ) ( 919 ) 781-4550 ( Registrant's telephone number , including area code ) ■ Trading Symbol ( s ) MLM Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in ale 405 of the Securities Act . Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Exchange Act . Yes No | Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes > No 56-1848578 ( I.R.S. Employer Identification No. ) 27607-3033 ( Zip Code ) Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S T during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes > Name of each exchange on which registered New York Stock Exchange No Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer Accelerated filer L Non - accelerated filer U 0 If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . □ DOCUMENTS INCORPORATED BY REFERENCE Document Proxy Statement for the Annual Meeting of Shareholders to be held May 13 , 2021 ( Proxy Statement ) Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes Smaller reporting company Emerging growth company No > As of June 30 , 2020 , the last business day of the registrant's most recently completed second fiscal quarter , the aggregate market value of the registrant's common stock held by non - affiliates of the registrant was $ 11,377,742,588 based on the closing sale price as reported on the New York Stock Exchange . Indicate the number of shares outstanding of each of the issuer's classes of common stock on the latest practicable date . Class Common Stock , $ .01 par value per share Outstanding at February 12 , 2021 62,286,775 shares Parts Into Which Incorporated Part III