CRH has built its business upon building materials. Through subsidiaries (including Oldcastle), the international company makes and distributes cement, concrete, aggregate, glass, and asphalt for commercial, residential, and infrastructure projects across the globe. CRH has some 4,000 operating locations and operates more than 700 wholesale and retail building supply stores under the Professional Builders Merchants, GAMMA, and Allied Building Products brands. With a presence in some 35 countries, CRH has become the top supplier of building materials in North America and the third-largest worldwide.