Sumco 

Sumco Corporation, together with its subsidiaries, manufactures and sells silicon wafers for the semiconductor industry primarily in Japan, the United States, China, Taiwan, Korea, and internationally. It provides monocrystalline ingots, as well as polished, annealed, epitaxial, junction isolated, silicon-on-insulator, and reclaimed polished wafers. The company was formerly known as Sumitomo Mitsubishi Silicon Corp. and changed its name to Sumco Corporation in August 2005. Sumco Corporation was incorporated in 1999 and is headquartered in Tokyo, Japan.