TOKYO OHKA KOGYO CO., LTD. (Headquarters: Nakahara-ku, Kawasaki City; President and Representative Director: Noriaki Taneichi; hereinafter the “Company”) hereby announces that the “Aso Kumamoto Site,” newly established in Kikuchi City, Kumamoto Prefecture, Japan, has commenced operations.

The Company opened the Aso Plant (Aso City, Kumamoto Prefecture, Japan) in 1984 and has been manufacturing high-purity chemicals. In recent years, as semiconductor production has expanded in the Kyushu area, the Company established the Aso Kumamoto Site in order to respond to growing demand and further strengthen its stable supply system. Construction of the site was completed in 2024.

The site is equipped with facilities that enable stringent quality control and will contribute to improving the quality and ensuring the stable supply of high-purity chemicals. With the commencement of operations, the Company will seek to expand its supply capacity through the synergy between the site and the Aso Plant, while further enhancing its user support system in Western Japan.

In order to realize the vision set forth in tok Vision 2030, the TOK Group plans total capital investments of 76.0 billion yen over the three-year period covered by tok Medium-Term Plan 2027, which commenced in fiscal 2025, representing the largest investment scale in its history. To respond to the medium- to long-term growth of the semiconductor market, we will continue to expand production capacity in Japan and overseas and strengthen our stable supply system, while focusing on bringing each investment project into operation as quickly as possible, thereby enhancing our cash-generating capabilities.

 

1.      Outline of the Aso Kumamoto Site of Aso Plant

　Name: Aso Kumamoto Site of Aso Plant
　Location: 987-2, Ninohigashioki, Kyokushikawabe, Kikuchi City, Kumamoto, Japan
　Purpose: Supply and quality control of high-purity chemicals
　Site area: 128 (thousand) m²
　Investment amount: Approximately 13 billion yen

 

2.      Future Outlook
The impact of this matter on the Company’s consolidated financial results has already been incorporated into the consolidated earnings forecast announced on February 9, 2026.

 

Related Releases

Notice regarding Completion of a New plant in “Aso Kumamoto Site” of Aso Plant | TOKYO OHKA KOGYO CO., LTD.
Notice regarding Establishment of New “Aso Kumamoto Site” of Aso Plant in Kikuchi City, Kumamoto Prefecture, Japan | TOKYO OHKA KOGYO CO., LTD. 

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