Sumitomo Chemical Advanced Technologies is a wholly owned subsidiary of Sumitomo Chemical Co. Ltd. located in Phoenix Arizona. In 2003, Sumitomo Chemical Co., Ltd. purchased the assets of ATMI’s GaAs epiwafer business and formed two new companies in Japan and the U.S. to strengthen its position in the market. Sumika Electronic Materials has been chartered to serve the global Semiconductor, Electronics, and IT-related industries.