Silicon United Manufacturing Corporation and Sumitomo Mitsubishi Silicon Corporation is a Japanese semiconductor company, manufacturing silicon wafers for semiconductor manufacturers worldwide. The company was established in 1999 as a joint venture between Mitsubishi Materials Corporation and Sumitomo Metal Industries and as of 2013 is the second largest silicon wafer producer in the world, after Shin-Etsu Handotai, with a market share of 30%.
SUMCO is listed on the first section of the Tokyo Stock Exchange and is a constituent of the Nikkei 225 stock index.
The company manufactures the following products:
- Single crystal silicon ingots
- Polished wafers
- Annealed wafers
- Epitaxial wafers
- Junction isolated wafers
- Silicon-on-Insulator (SOI) wafers
- Reclaimed polished wafers