Founded in 1999 as a joint venture between Nippon Steel and two Mitsubishi entities, Sumco is the world’s second-largest semiconductor-grade silicon wafer manufacturer, with 24% market share in 2023. Sumco is headquartered in Tokyo and operates seven production sites across Japan. It also maintains sales and support offices in Taiwan, the U.S., the U.K., Indonesia, and Singapore. Sumco sells to most semiconductor manufacturers like TSMC, Intel, Samsung and Micron. The firm employs over 9,000 people.
