Investor Presentation - January 2019

DOING BUSINESS THE RIGHT WAY Martin Marietta will conduct its business in strict compliance with applicable laws, rules, regulations, and corporate and operating unit policies, procedures and guidelines, with honesty and integrity, and with a strong commitment to the highest standards of ethics. It is the obligation of all directors, officers, employees and consultants, as well as contingent and temporary employees of Martin Marietta, to adhere to these standards. Investor Presentation - January 2019 A Martin Marietta Code of Ethical Business Conduct www.martinmarietta.com NYSE:MLM 9

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