As of September 2026 Martin Marietta Materials has a market cap of โฌ30.36 Billion. This makes Martin Marietta Materials the world's 718th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On Sep 20th, 2026 the market cap of Martin Marietta Materials was reported to be: