Investor Presentation - January 2019

BENEFITING FROM THE INCREASING STRENGTH OF THE CURRENT CONSTRUCTION CYCLE TOP 9 STATES * MID-CYCLE AGGREGATES DEMAND IOWA 20% below At mid-cycle 20% above 10% below 10% above Martin Marietta FORECASTED POPULATION GROWTH 2017 - 2040 FISCAL HEALTH 9% AAA SOUTH CAROLINA 25% AA+ 20% below At mid-cycle 20% above 10% below 10% above FLORIDA MARYLAND INDIANA * Martin Marietta's top 9 revenue-generating states based on 2017 Building Materials net sales by state of destination and adjusted for Bluegrass 35% AAA 20% below At mid-cycle 20% above 10% below 10% above 20% below At mid-cycle 20% above 17% AAA 10% below 10% above 20% below At mid-cycle 20% above 10% below 10% above Management calculation based on aggregates consumption per capita multiplied by estimated state population 7% AAA Sources: U.S. Bureau, Population Division (December 2017) and Weldon Cooper Center for Public Service (May 2016) U.S. State Ratings and Outlooks April 13, 2018 Source: S&P Global 36

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