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 |