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Last close 2305.50000000 on 2026-11-02
Founded: 1999-07-30 (as Silicon United Manufacturing Corp.); merger completed 2002
Founders: Joint venture of Sumitomo Metal Industries, Mitsubishi Materials, and Mitsubishi Materials Silicon; formally merged 2002 from Mitsubishi Materials Silicon and Sumitomo Metal Silicon
SUMCO was formed to combine several Japanese metals conglomerates' silicon-wafer businesses and is now one of the world's largest suppliers of silicon wafers for semiconductors.
