Martin Marietta

Martin Marietta is one of the largest producers of construction aggregates in the United States, supplying crushed stone, sand and gravel along with cement, ready-mixed concrete and asphalt. Headquartered in Raleigh, North Carolina, the company runs quarries and plants across the country and feeds everything from highways and airports to data centers and water infrastructure. In 2026 it pushed further into higher-margin materials with a $13.5 billion agreement to acquire Lhoist North America, a major lime producer. Its products end up in a large share of the heavy civil and public works built across the Sun Belt and beyond.