CPC SouthWest Materials, a subsidiary of California Portland Cement Company, is a supplier of ready-mixed concrete, aggregates and asphalt to the construction industry. The company operates approximately five manufacturing facilities. California Portland Cement Company is part of the Taiheiyo Cement Corporation, aTokyo-based group of companies that consists of more than 325 subsidiaries and 150 affiliates, which are organized into seven in-house companies covering cement, mineral resources, environmental, real estate, construction materials, ceramics and electronics. The group employs more than 2,100 people and operates more than 20 cement plants worldwide. CPC SouthWest Materials employs more than 160 people and is based in Tucson, Ariz.