Martin Marietta Materials is one of the largest U.S. producers of construction aggregates, including crushed stone, sand, and gravel. In 2024, the company sold 191 million tons of aggregates. Its key markets are Texas, North Carolina, Colorado, California, and Georgia, which generate most of its sales. Martin Marietta also uses its aggregates in its asphalt and ready-mixed concrete operations. In addition, its magnesia specialties segment manufactures magnesia-based chemical products and dolomitic lime.