Tokyo Ohka Kogyo

Listing on the TSE second section to fund production capacity (1986)

Key decision·1986· Tokyo Ohka Kogyo — the full company history →

A wallet for defending a near-monopoly

It is too quick to read this listing as no more than arranging money for expansion. What President Ito Takeo gave as his reason was not funds but the social responsibility that went with a near-monopoly — more than 70% of photoresist and over 90% of purified potassium hydroxide. The company was holding the trade secrets of a great many customers, in a business where one product going wrong could cost them hundreds of millions of yen the following day; management appears to have been uneasy about continuing that while remaining privately held. Before it was a way of raising money, the listing was a declaration of the position the company occupied.

What the proceeds were actually spent on, though, the company itself never recorded. Ito spoke of oligopoly and responsibility, not of a capital-spending figure or a use of proceeds. In the year it listed, the sales outlook had fallen from the previous year’s $255.2M (¥43bn) to $219.6M (¥37bn). Reading it as “securing a financial base” is something supplied in hindsight, from the later facts of the Gotemba plant and the American subsidiary the next year. Even so, it can be said that having a wallet that let it keep its hands moving through a trough in the market had become a condition of defending the near-monopoly.

Revenue and net margin, FY1981–FY1991

Revenue in ¥ bn (bars) and net margin in % (line), for the years around the decision. Shaded columns are FY1986 onwards — after it was taken.

Source: securities reports

Read the full dossier in Japanese →

The Japanese edition carries the complete record of this decision — the situation that forced it, the options weighed, what actually followed, and the sources behind every claim.

Other key decisions at Tokyo Ohka Kogyo


Yen amounts are converted at the average rate of each figure’s own year — not today’s rate; the revenue chart is shown in yen. Exchange rates & sources — the full ¥/US$ table →


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Data API

Tokyo Ohka Kogyo’s history, financials, executives and shareholders are published as static JSON — no key, plain GET. Full specification →

Method Endpoint Returns
GET /api/companies.json All companies
GET /api/4186/manifest.json Resource index
GET /api/4186/history.json History overview
GET /api/4186/timeline.json Chronology
GET /api/decisions.json All management decisions (index)
GET /api/4186/decisions.json Management decisions (index)
GET /api/4186/decisions/{slug}.json One decision (full dossier)
GET /api/4186/executives.json Executives
GET /api/4186/shareholders.json Major shareholders
GET /api/4186/financials.json Financial statements
GET /api/4186/financials-longterm.json Long-term results
GET /api/4186/segments.json Business segments
GET /api/4186/regions.json Sales by region
GET /api/4186/workforce.json Workforce