The story
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%. In 2001, SUMCO employed about 1,300 people in Oregon, which in 2003 was reduced to 680 after the U.S. manufacturing operations were consolidated.
In June 2006, SUMCO acquired a 51% controlling stake in Komatsu Electronic Metals Co., making them a member of the SUMCO group. Komatsu Electronic Metals Co. has a venture partnership with Formosa Plastics Group and has wafer plants in Miyazaki and Nagasaki.
SUMCO acquired Mitsubishi Polycrystalline Silicon America Corp and Semiconductor Polysilicon Business Of Mitsubishi from Mitsubishi Materials Corporation in May 2023.
SUMCO is listed on the first section of the Tokyo Stock Exchange and is a constituent of the Nikkei 225 stock index.
From Wikipedia’s article on SUMCO, shared under CC BY-SA 4.0.5