ABC Supply Company, Inc.

With over 340 distribution centers in 45 states, plus the District of Columbia, this Beloit, Wisconsin supplier of exterior building products has tripled in size since 1996. ABC Supply is now the largest roofing and vinyl siding wholesale distributor in the U.S. Also known as American Builders & Contractors Supply Co., the company uses a fleet of over 3,300 delivery units to bring materials directly to contractors and builders.