| 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 |
| micro resist technology GmbH |
micro resist technology GmbH（MRT） engages in development, production and sale of photoresists and other chemical materials for optical components, sensors, micro-optics, AR/VR, biosensors, and microfluidic devices. |
February,2025（Subsidiarization） |
