TOKYO OHKA KOGYO CO., LTD. (Headquarters: Nakahara-ku, Kawasaki City; President and Representative Director: Noriaki Taneichi; hereinafter the “Company”) hereby announces that it has completed construction of the Pyeongtaek Plant (Pyeongtaek, Gyeonggi Province, South Korea) at its consolidated subsidiary, TOK Advanced Materials Co., Ltd. (Headquarters: Incheon Metropolitan City, South Korea; hereinafter “TOKAM”). The Plant is the Group’s second production site in South Korea and is scheduled to commence operations in the first half of 2027. 

TOKAM was established in 2012 as a site for research and development, manufacturing, and sales of photoresists in South Korea under our customer-oriented strategy and has since driven the expanded adoption of the Group’s products in South Korea .  

The Company has adopted a “local production for local consumption” business model strategy for the supply of high-purity chemicals, under which it produces products close to customers’ manufacturing sites to ensure a stable supply. At the recently completed Pyeongtaek Plant, the Company constructed a high-purity chemical manufacturing building as Phase 1. This has established the Group’s first production site for high-purity chemicals in South Korea, enabling prompt and stable supply to customers in South Korea. 

The newly constructed high-purity chemical manufacturing building is equipped with cleanroom areas that provide the high level of cleanliness required for cutting-edge semiconductor manufacturing, enabling the stable production of high-quality products. Through production and supply in South Korea, the Company will be able to respond promptly and flexibly to customer needs. The building is also expected to serve as an important production base supporting the further growth of the Group’s high-purity chemicals business in South Korea. 

Under the “tok Medium-Term Plan 2027,” the TOK Group aims to build a robust supply chain. Looking ahead to the continued expansion of the semiconductor market, the Group will continue to actively consider capital investments to expand its production base and strengthen its R&D capabilities, with the aim of ensuring the stable supply of high-quality products.

Exterior View of the Manufacturing Building 

 

【Pyeongtaek Plant (Phase 1) Overview】 

1.Location： Pyeongtaek, Gyeonggi Province, South Korea  
2.Total floor area： Approximately 6,300 m² 
3.Construction details： Includes a high-purity chemical manufacturing building,  warehouses, and ancillary facilities 
4.Investment amount： Approximately ¥12.0 billion  
5.Completion： September 15, 2026
6.Scheduled start of operations： First half of 2027 

【Future Outlook】 

The impact of this matter on the Company’s financial results has already been reflected in the consolidated financial forecasts announced on August 6, 2026.  

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For contact: Public Relations and IR Department 
TEL: +81-44-435-3000