Sumco Corporation (Sumco) formerly Sumitomo Mitsubishi Silicon Corp. is a technology company. It manufactures silicon wafers for semiconductor industry. Its major products include single crystal silicon ingots, polished wafers, annealed wafers, epitaxial wafers, junction isolated wafers, silicon-on-insulator wafers, specifications of silicon wafers and reclaimed polished wafers. It also manufactures and sells high-purity quartz crucibles used in the manufacturing process of silicon wafers. The company has offices and manufacturing plants in various parts of Japan and it operates in North America, Asia and Europe through subsidiaries. Sumco is headquartered in Tokyo, Japan.