Producer
Tokyo Ohka Kogyo (TOK)
Tokyo Ohka Kogyo Co., Ltd. (TOK; Kawasaki, Kanagawa; TSE: 4186; ~¥260B revenue) is Japan's third-largest EUV photoresist manufacturer, holding approximately 15-20% of the global EUV photoresist market. TOK's primary EUV resist production is at its Kanagawa (Kawasaki) plant. TOK operates the TAJRC (Tama Advanced Research Joint Center) in Tama, Tokyo — a next-generation resist development laboratory focused on High-NA EUV and metal-oxide resist chemistries. TOK's fluorinated polyimide was one of the three chemicals targeted in Japan's July 2019 export controls on South Korea. Also produces chemical mechanical planarization (CMP) slurries and developer chemicals for semiconductor fabs.
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Inputs supplied
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Goods downstream
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Facilities
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Stories
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2 inputs Tokyo Ohka Kogyo (TOK) supplies
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4 facilities
TOK Kanagawa Photoresist Plant (Kawasaki) →
JPKanagawa Prefecture · manufacturing
Tokyo Ohka Kogyo's primary photoresist manufacturing plant in Kawasaki, Kanagawa Prefecture. Produces TOK's EUV, ArF, and KrF photoresist product lines. TOK's Kanagawa campus is adjacent to the company's TAJRC (Tama Advanced Research Joint Center) next-generation resist laboratory. TOK's fluorinated polyimide (produced at this facility) was one of three chemicals targeted by Japan's July 2019 export controls on South Korea — causing Samsung and SK Hynix to scramble for alternative supply. Source: https://www.tok.co.jp/eng/ir/
TOK Koriyama Plant (Fukushima) — EUV/ArF →
JPFukushima Prefecture · manufacturing
Tokyo Ohka Kogyo primary EUV and ArF photoresist manufacturing plant in Koriyama City, Fukushima Prefecture. Major ¥200B+ expansion underway; new building operational H2 2026 (will be TOK's largest plant). Suspended after April 20, 2026 magnitude 7.7 earthquake; 4-8 week resumption estimate. Combined with Shin-Etsu Shirakawa, Fukushima region disruptions represent ~25% of global advanced photoresist capacity at risk from a single seismic event. Source: https://www.trendforce.com/news/2026/04/21/news-kioxia-tel-and-photoresist-makers-in-focus-after-magnitude-7-7-japan-earthquake-supply-chain-impact-mixed/
TOK TAJRC Advanced Resist R&D Center (Tama, Tokyo) →
JPTokyo · r_and_d
Tokyo Ohka Kogyo's TAJRC (Tama Advanced Research Joint Center) in Tama, Tokyo is a next-generation photoresist development laboratory focused on High-NA EUV resist chemistries and metal-oxide resist alternatives to JSR/Inpria's tin-oxide platform. TAJRC represents TOK's strategic effort to develop competitive next-generation resists before High-NA EUV reaches volume production. The center is a joint research initiative with semiconductor fab partners. Source: https://www.tok.co.jp/eng/ir/
TOK Utsunomiya Plant (Tochigi) →
JPTochigi Prefecture · manufacturing
Tokyo Ohka Kogyo mass-production facility in Kiyohara Industrial Park, Utsunomiya, Tochigi. Produces all photoresist types at scale; primary volume manufacturing site. Source: https://www.tok.co.jp/eng/news/2023/230808_4
What else they do
Business segments
The company's full revenue map — where this supply-chain role fits within their broader business.
EUV & DUV Photoresists
45%Specialty Process Chemicals
30%Fluorinated Polyimide & Electronic Materials
15%High-NA EUV & Next-Gen Development
10%
Intelligence
What's known
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Did you know2019
TOK's fluorinated polyimide was one of three materials targeted by Japan's July 2019 export controls on South Korea -- a trade restriction that explicitly used semiconductor supply chain leverage as a geopolitical instrument in response to a South Korean Supreme Court ruling on wartime labor. Samsung and SK Hynix, which depend on TOK fluorinated polyimide for flexible OLED display manufacturing and semiconductor interconnect applications, faced supply interruption. The 2019 incident revealed that a Japanese photochemistry company's specialty polymer -- developed for civilian electronics applications -- had become a geopolitical lever in an inter-government dispute between two US allied democracies. TOK simultaneously supplies EUV photoresists (cutting-edge chip manufacturing), CMP slurries (wafer polishing for all chip nodes), and fluorinated polyimide (flexible electronics and semiconductor packaging) -- three product lines serving the same chip supply chain at different process steps, each carrying independent geopolitical supply chain risk from their Japanese manufacturing origin.
Reuters ↗Origin2023
Tokyo Ohka Kogyo (TOK) was founded in 1940 in Kawasaki, Kanagawa as a photosensitive chemical company serving Japan's prewar printing and lithography industries. The transition from printing photoresist to semiconductor photoresist was natural: the same UV-sensitive polymer chemistry that creates printing plates was adapted for chip lithography as Japan's semiconductor industry developed through the 1960s-1980s. TOK built its chip photoresist business alongside Japanese chip manufacturers Toshiba, Hitachi, and Fujitsu. The fluorinated polyimide product that became the center of the 2019 Japan-Korea trade dispute had been a TOK specialty for decades -- originally developed for Japanese consumer electronics flexible display applications before becoming a critical material in Samsung's and SK Hynix's OLED display supply chain. TOK's Kawasaki headquarters sits in the Keihin Industrial Zone -- the same Tokyo Bay industrial corridor that hosts Japanese automotive, steel, and electronics manufacturing -- a 120-year-old photochemistry company now producing the photoresists that define the frontier of global chip manufacturing.
Tokyo Ohka Kogyo Co., Ltd. ↗