Sumco Corporation through the years: building semiconductor silicon wafers

SUMCO’s modern history began in 1999 when Sumitomo Metal Industries, Mitsubishi Materials and Mitsubishi Materials Silicon created Silicon United Manufacturing Corporation around advanced silicon-wafer production.

How Sumco Corporation developed

In 2002 the business combined with additional silicon operations and became Sumitomo Mitsubishi Silicon. It adopted the SUMCO name in 2005 and listed in Tokyo the same year, building scale in 200 mm and 300 mm semiconductor wafers.

Sumco Corporation in 2026

By 2026, SUMCO was one of the major global suppliers of high-purity silicon wafers used as the starting substrate for semiconductor manufacturing.

The company sits far upstream from consumer chips, but wafer quality and capacity are fundamental constraints in semiconductor production, making SUMCO an important part of the industry’s supply chain.

Information was checked against public company material, regulatory filings and reputable independent reporting where available, using sources accessible on 18 September 2026.