The Sterling Group-backed Construction Supply Group, a leading distributor of specialty construction materials, completed the acquisitions of Best Materials, Advantage Construction Supply and Spec-West Concrete Systems. Best Materials is a construction supply e-commerce platform based in Phoenix, Arizona. Advantage and Spec-West are concrete and construction supply providers with a combined four branches in California. Financial terms were not disclosed. With these additions, Construction Supply Group will have the leading market position in the Sacramento, California market and will have a further enhanced e-commerce capability. The three acquisitions result in a total of sixteen regional businesses acquired under Sterling's ownership.