Major silicon wafer manufacturing and production operations in the United States include facilities run by global industry leaders such as SUMCO Phoenix Corporation, GlobalWafers America (which has invested heavily in large-scale domestic 300mm wafer facilities in Texas), Okmetic, and specialized domestic providers like WaferPro. These companies supply high-purity single-crystal silicon ingots, polished wafers, and epitaxial products to support domestic semiconductor fabrication plants.