Tokyo Ohka Kogyo

Building on microfabrication technology using photolithography, Tokyo Ohka Kogyo (TOK) is expanding its business across a wide range of fields, from semiconductor manufacturing to solar panels and nanoimprinting.

TOK actively supports promising venture companies that are expected to generate synergies in technology.

TOK products contribute to miniaturization and higher performance in the manufacture of electronic components, including image sensors—the heart of smartphone cameras—and BAW filters used in antenna sections.

TOK seeks to create new value by collaborating with companies, universities, and research institutions in Japan and abroad, drawing on its accumulated expertise in microfabrication and high-purity processing as core technologies.

Tokyo Ohka Kogyo and artience held Material Technology Market on September 18, 2026, bringing together 29 companies and 328 attendees to discuss materials, core technologies, applications, technical challenges, and cross-industry collaboration.

*Beginning with the 2026 edition, the year in the title has been changed to match the year of publication. As a result, there will be no “Integrated Report 2025.”

Tokyo Ohka Kogyo Co., Ltd. (head office: Nakahara-ku, Kawasaki; President: Junaki Taneichi; hereinafter, “the Company”) has completed a new manufacturing building for semiconductor photoresists at its Koriyama Plant in Koriyama, Fukushima Prefecture.

Tokyo Ohka Kogyo completed the Pyeongtaek Plant in South Korea, operated by subsidiary TOK Advanced Materials. The TOK Group's second South Korean production site is scheduled to begin operations in the first half of 2027.

Outside Director, Audit and Supervisory Committee Member (Partner, Harago Sogo Law Office; Outside Director, Audit and Supervisory Committee Member, Tokai Tokyo Financial Holdings, Inc.) Ayako Ikeda

150 Nakamaruko, Nakahara-ku, Kawasaki, Kanagawa 211-0012 (Map) TEL: 044-435-3000 (Main) FAX: 044-435-3020 (Main)

The page features President Junaki Taneichi's introduction to the company's basic philosophy and management policies.

TOK was founded in 1940 and follows four management principles: an open culture, technological excellence, product advancement, and contribution to society. It says chemistry will support people's lives and sustainable societal development.

Tokyo Ohka Kogyo (TOK)'s company information includes a president's message, domestic and overseas locations, company profile, and history.

Tokyo Ohka Kogyo Co., Ltd. and its group companies identify protection of TOK Group personal information as a major responsibility and have established a policy for handling it.

The page outlines the website's terms of use.