Tokyo Ohka Kogyo (TOK)
TSE:4186Structural picks-and-shovel position in the AI Semis supply chain, Layer 7. Tier C conviction with research from AI Master Research.
The full 1-page snapshot on Tokyo Ohka Kogyo (TOK).
What it physically does · the financial print · customer mix · competitive context · terminal risk · bull case · gap/bear case · optionality · the trade. ~230 words. Source: AI Master Research.
What 4186 physically does — preview.
One-paragraph version of the Photoncap deep dive. Read the full essay for the complete treatment.
The thesis — preview.
**Live:** price not surfaced (needs manual check on Yahoo 4186.T) JPY · **Earnings (last):** Q1 2026 — rev surprise +5.90%, EPS beat consensus; guide neutral · **Next earnings:** 2026-05-13 (release reference; verify on next report) · **Conviction:** 4/10 TOK is one of three Japanese photoresist majors (with JSR and Shin-Etsu Chemical) and one of the few EUV photoresist suppliers globally. EUV photoresist is the chemistry layer that enables sub-7nm patterning — without it, the AI logic node ramp stops. Real bottleneck, real moat. Feb 2026 partnership with Irresistible Materials extends the EUV roadmap, and Q1 revenue beat by 5.9% confirms underlying franchise health.…