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Martin Marietta Materials, Inc.
Martin Marietta digs up rock, sand, and gravel and turns limestone into cement and concrete, selling the basic ingredients that roads, buildings, and homes are built from.
Martin Marietta is a big supplier of the crushed stone, sand, gravel, and cement that go into roads, bridges, buildings, and homes. Its customers are mostly construction companies and government agencies that need these raw ingredients by the truckload, often on short notice and in huge volumes.
The business works because of a simple quirk of geology and geography: heavy, low-value rock is expensive to move. A quarry near a fast-growing city is worth far more than a better quarry a hundred miles away, because hauling rock long distances eats the profit. Martin Marietta runs hundreds of quarries and mines, mostly in the United States, and its real moat is its network of local sites close to where people are building. Once a quarry is permitted and running, competitors can't easily copy it, since new mines face years of zoning fights and local opposition.
Beyond aggregates, the company has pushed into cement and ready-mixed concrete, partly through its big 2021 deal for the Texas cement producer Lehigh Hanson's West Region business. That moved Martin Marietta more deeply into the full chain of building materials and gave it a larger role in fast-growing markets like Texas. The catch is that this business rises and falls with construction spending and interest rates — when building slows, so do rock sales. Still, because rock is cheap to produce and the quarries are hard to replace, the company throws off a lot of cash, which it uses for dividends, buying back shares, and acquiring more quarries. Rivals include Vulcan Materials and CRH, but location often matters more than size.
Saved answer · last researched 12 Nov 2026