SUMCO (OTCMKTS:SUOPY) Corporation (OTCMKTS: SUOPY) is a premier global supplier of silicon wafers, a foundational material used in the fabrication of semiconductor devices. The company specializes in producing single-crystal silicon wafers in diameters ranging from 150 mm to 300 mm, serving high-performance applications in memory, logic, power devices and discrete components. In addition to its core wafer business, SUMCO offers epitaxial wafers and specialty silicon products designed to meet the exacting requirements of next-generation semiconductor nodes and power electronics.
Founded in 1975 as a spin-off from Mitsubishi Silicon, SUMCO has grown through strategic investments in research and development to advance wafer quality, diameter scaling and defect reduction. Its proprietary crystal pulling, slicing and polishing technologies enable tight control of crystallographic orientation, resistivity and thickness uniformity. Over the decades, SUMCO has expanded its production capacity to support the industry’s move toward finer lithography and higher integration levels.
SUMCO operates manufacturing and R&D facilities across Asia, North America and Europe. Major production sites are located in Japan, Singapore and South Korea, with additional wafer finishing and sales offices in the United States and the United Kingdom. This global footprint allows the company to supply leading semiconductor foundries, memory makers and device manufacturers in key markets such as Taiwan, South Korea, China and the United States, while maintaining close technical collaboration with its customers.
The company is led by President and CEO Tomoo Moriyama, under whose leadership SUMCO continues to pursue advanced wafer development and sustainability initiatives. As semiconductor technology evolves toward 3D architectures and wide-bandgap materials, SUMCO aims to leverage its high-precision manufacturing expertise to support the next generation of electronic devices.
