Vulcan Materials Co. | Birmingham, Ala.

This is the largest U.S.-owned company on the list, and the country’s biggest producer of aggregates. Vulcan’s revenue grew by more than 10% in 2008, largely because of its 2007 purchase of Florida Rock. Ready-mix concrete accounts for 17% of Vulcan’s business, with aggregates taking up the largest share. Vulcan serves 25 states and Mexico. Up to 60% of the $27.5 billion set aside for bridges and highways in the federal stimulus package could go to the states the company serves.¬†www.vulcanmaterials.com