# Tokyo Ohka Kogyo

Tokyo Ohka Kogyo is an Asset Manager based in Yokohama, Japan.

## Overview

- **Organization type:** Asset Manager
- **Headquarters:** Yokohama, Japan
- **Region:** North America
- **Address:** Yokohama, Japan
- **Assets under management:** Undisclosed
- **Website:** www.tok.co.jp

## Regulatory record

- **Reports private funds:** No

## About

Tokyo Ohka Kogyo develops and manufactures materials and technology for the semiconductor industry. Its products include photoresist materials and other semiconductor fabrication essentials. Founded in 1940, the company is based in Kawasaki, Japan.

## Sectors

- Semiconductors
- Industrial Tech
- Chemicals

## Offices

- Santa Clara, United States
- Seoul, South Korea
- Paris, France

## Questions

### What are Tokyo Ohka Kogyo's core technologies?

TOK specializes in two core technologies: microfabrication and ultra-purification. These underpin its production of photoresists, anti-reflective coatings, developers, etching gases, and cleaning chemicals for semiconductor manufacturing (per the firm's website).

### Who are Tokyo Ohka Kogyo's primary customers?

TOK's customers include leading global semiconductor foundries and memory manufacturers, though specific company names are not always publicly listed. The company serves clients in Japan, South Korea, Taiwan, the US, and Europe (per the firm's website).

### Is Tokyo Ohka Kogyo publicly traded or privately held?

TOK is listed on the Tokyo Stock Exchange. It reports financial data quarterly and discloses some operational metrics via its investor relations section (per the firm's website).

### What regions does Tokyo Ohka Kogyo operate in?

TOK has offices in Yokohama (HQ), Santa Clara, Seoul, and Paris. Its manufacturing and R&D are primarily in Japan, with technical support centers in other regions (per the firm's website).

### What is Tokyo Ohka Kogyo's role in the semiconductor supply chain?

TOK supplies high-purity chemicals used in photolithography and etching processes, critical for producing advanced semiconductor nodes. Its materials enable nanometer-scale circuit patterns. Qualification cycles for new suppliers are long, creating high switching costs for chipmakers.

### How many employees does Tokyo Ohka Kogyo have?

TOK employs several thousand people globally, according to its corporate profile. Exact figures are not publicly broken down by region or function.

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Last updated: 2026-06-03T20:00:00.000Z

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