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These shares were sold in multiple transactions at prices ranging from $225.2131 to $225.32, inclusive.  The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4."}],"balance_after":6305,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":23,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085362,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2020-06-05","kind":"sale","acquired":false,"shares":3500,"price":226.8012,"value":793804.2,"ownership":{"direct":true},"balance_after":19689.687,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":22,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085361,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2020-03-31","kind":"purchase","acquired":true,"shares":8.228,"price":177.2363,"value":1458.3002764,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":23189.687,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":21,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085360,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2019-12-31","kind":"purchase","acquired":true,"shares":5.246,"price":277.4342,"value":1455.4198132,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":23106.459,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":20,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085359,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2019-09-30","kind":"purchase","acquired":true,"shares":5.354,"price":271.2869,"value":1452.4700626,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":23038.213,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":19,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085358,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2019-06-28","kind":"purchase","acquired":true,"shares":5.581,"price":226.6493,"value":1264.9297433,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":22965.859,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":18,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085357,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2019-03-29","kind":"purchase","acquired":true,"shares":6.299,"price":200.335,"value":1261.910165,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":22279.278,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":17,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085356,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2018-12-31","kind":"purchase","acquired":true,"shares":7.454,"price":168.8127,"value":1258.3298658,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":22182.979,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":16,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085355,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2018-09-28","kind":"purchase","acquired":true,"shares":6.751,"price":185.9117,"value":1255.0898867,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":22086.525,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":15,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085354,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2018-06-29","kind":"purchase","acquired":true,"shares":5.161,"price":222.4821,"value":1148.2301181,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":18494.774,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":14,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085353,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2018-03-29","kind":"purchase","acquired":true,"shares":5.646,"price":202.9313,"value":1145.7501198,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":17804.613,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085352,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2017-12-29","kind":"purchase","acquired":true,"shares":5.244,"price":218.0473,"value":1143.4400412,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":17715.967,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085351,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2017-09-29","kind":"purchase","acquired":true,"shares":5.54,"price":205.9567,"value":1141.000118,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":17629.723,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085350,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2017-06-30","kind":"purchase","acquired":true,"shares":4.894,"price":222.1251,"value":1087.0802394,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":17544.183,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085349,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2017-03-31","kind":"purchase","acquired":true,"shares":5.069,"price":214.0363,"value":1084.9500047,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":17026.289,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085348,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2016-12-30","kind":"purchase","acquired":true,"shares":4.783,"price":226.4144,"value":1082.9400752,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":16942.22,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085347,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2016-09-30","kind":"purchase","acquired":true,"shares":5.915,"price":182.6644,"value":1080.459926,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":16860.437,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085346,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2016-06-30","kind":"purchase","acquired":true,"shares":11.953,"price":186.0813,"value":2224.2297789,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. These transactions should have been previously reported on Form 4 or Form 5, as applicable, and were inadvertently reported late by the Reporting Person."}],"balance_after":16761.522,"source":{"system":"sec-edgar","filing":"0001127602-20-021365","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1084501/000112760220021365/form4.xml","form_type":"4"}},{"id":3085345,"issuer":{"id":587,"kind":"organization","name":"MARTIN MARIETTA MATERIALS INC","symbol":"MLM"},"owners":[{"id":147901,"kind":"person","name":"ZELNAK STEPHEN P JR","position":1,"cik":"0001084501","reported_name":"ZELNAK STEPHEN P JR","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-07-10T17:13:48.000Z","date":"2016-03-31","kind":"purchase","acquired":true,"shares":0.882,"price":154.7732,"value":136.5099624,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired by the Reporting Person under an automatic dividend reinvestment program through his broker for quarterly cash dividends paid by the Issuer to stockholders in 2015, 2016, 2017, 2018, 2019 and 2020. 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