SUMCO Corporation traces its corporate roots back to July 1999 when it was established as a joint venture named Silicon United Manufacturing Corporation, formed through the pooling of silicon wafer operations between Sumitomo Metal Industries and Mitsubishi Materials. Over subsequent decades, the company expanded rapidly through strategic mergers—including renaming to Mitsubishi Sumitomo Silicon and later acquiring Komatsu Electronic Metals—evolving into one of the world's largest semiconductor-grade silicon wafer manufacturers.