Martin Marietta Aggregates, 2002 County Road 20 1/2, Longmont, CO 80504, US

Lafarge North America is among the largest diversified construction materials companies and is a supplier of cement, aggregates and concrete and other materials for residential, commercial, institutional and public works construction in North America. The company is part of the Lafarge Group, a leader in building materials that is active in nearly 75 countries and employs more than 75,000 people. Lafarge and its subsidiaries are one of the largest suppliers of cement and leading ready-mixed concrete in North America. The company maintains more than 1,000 operations doing business throughout the United States and provinces in Canada. Its products are utilized in the construction of a variety of projects, such as roads, offices, factories, hospitals, department stores, sports stadiums, banks, museums, high-rise apartments, amusement parks, swimming pools and bridges. Lafarge North America maintains a location in Fort Collins, Colo.