Sumco Corp (Sumco) manufactures and sells silicon wafers. The company supplies various silicon products for the semiconductor industry. Its product portfolio consists of polished wafer annealed wafers, epitaxial wafers, junction isolated wafer, silicon-on-insulator wafers and reclaimed polished wafer. It manufactures ingots up to 300mm in diameter, which are produced by the method of Magnetic czochralski (MCZ) method.

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Sumco’s R&D arm focused on developing technologies for fabrication at the ultra-fine nanoscale sector. It also focuses on the development of epitaxial wafers. It carries out R&D, such as simulation of chemical reactions in fluid simulation and reaction furnace of gas flow. Apart from this, it is working on applying AI technologies to its production areas. As of December 2024, the company held approximately 3,600 patents. In FY2024, the company incurred expenses of JP8,532 million on R&D, which as a percentage of the revenue, stood at 2.2%.