Company History

[*1] In July 1999, Sumitomo Metal Industries, Ltd., Mitsubishi Materials Corp. and Mitsubishi Materials Silicon Corp. established a jointly-owned company deleloping and manufacturing 300mm silicon wafers named Silicon United Manufacturing Corp.

[*2] In February. 2002, Silicon United Manufacturing Corp. acquired the silicon wafer business from Sumitomo Metal Industries Corp., merged with Mitsubishi Materials Silicon Corp. and changed its trade name into Sumitomo Mitsubishi Silicon Corp., at the same time.

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