TOKYO OHKA KOGYO CO., LTD. engages in the manufacture and sale of electronic functional materials and high-purity chemicals. It operates through the Materials segment, which provides a wide range of photoresists and high purity chemicals, which are widely used in the manufacture of semiconductors, liquid crystal displays, semiconductor packaging, and electronic products. The company was founded on October 25, 1940 and is headquartered in Kawasaki, Japan.