Investor Presentation - January 2019

PROACTIVELY ENGAGING WITH SHAREHOLDERS Overboarding Policy Annual Election of Directors Mandatory Retirement Non- Management & Independent Directors Meet Regularly Without Management Age for Directors CORPORATE GOVERNANCE HIGHLIGHTS ✓ Adopted proxy access ✓ Eliminated staggered board – Directors - 6 current or former public company CEOs Martin Marietta Annual Board and Committee Self- Assessment Independent Lead Director No Pledging or Hedging of Martin Marietta Stock SHAREHOLDER RIGHTS AND GOVERNANCE PRACTICES Majority Voting for Shareholders Proxy Access Clawback Policy Robust Stock Ownership Requirements No Poison Pill elected for 1-year terms Established robust stock ownership guidelines for Officers and Directors ✓ Implemented hedging and pledging policy ✓ Adopted clawback policy ✓ Implemented majority voting standard ✓ Eliminated shareholder rights plan ✓ Added 3 new Board members since 2016 ✓ Published Annual Sustainability Report 66 years old average Director age BOARD WITH DIVERSE SKILLS AND EXPERIENCE 11 years average Director tenure 30% of directors are women or minorities As reported in Martin Marietta's 2018 Annual Meeting of Shareholders Proxy Statement dated April 18, 2018 Investor Presentation - January 2019 11 11

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