Subsidiaries

Subsidiaries in Japan

Company Name Business Details Established
OHKA SERVICE CO., LTD. Insurance agancy May, 1986
TOK ENGINEERING CO., LTD. Manufacture and sales of automatic chemical supplying machines October, 1992

Worldwide Subsidiaries

Company Name Business Details Established
TOKYO OHKA KOGYO AMERICA, INC. Manufacture and sales of photoresists and high-purity chemical agents used mainly in photolithography processes in the field of semiconductors April, 1989
TOK TAIWAN CO., LTD. Manufacture and sales of high-purity chemical agents used mainly in photolithography processes in the fields of semiconductors, flat panel displays and package modules, and sales equipment used in the fiel January, 1998
TOK ADVANCED MATERIALS CO., LTD. Developments, Manufactures, and sales of photoresists for semiconductors and photoresist-related high-purity chemicals August, 2012
TOK CHINA CO., LTD. Sales of photoresists for semiconductor and LCD, and photoresist-related high-purity chemicals in CHINA January, 2021