Martin Marietta Aggregates offers a range of crushed stone and sand and gravel products. It is one of the leading producers of construction aggregate materials in the United States. The company provides products for road, sidewalk and foundation construction applications. Martin Marietta Aggregates also offers asphalt and concrete products. It operates more than 280 quarries and distribution facilities in over 25 U.S. states. The company provides various technical support, testing and research services. Martin Marietta Aggregates has shipped nearly 150 million tons of aggregate materials annually. It is a part of Martin Marietta Materials, which is a publicly traded company that maintains a staff of approximately 4,900 employees.