# Tokyo Ohka Kogyo Co., Ltd.

Tokyo Ohka Kogyo Co., Ltd. is an other based in Kawasaki, Japan.

## Overview

- **Organization type:** other
- **Headquarters:** Kawasaki, Japan
- **Region:** Asia
- **Address:** Kawasaki, Kanagawa, Japan
- **Founded:** 1935
- **Assets under management:** Undisclosed
- **Website:** tok.co.jp

## Regulatory record

- **Reports private funds:** No

## About

Tokyo Ohka Kogyo Co., Ltd. was founded in 1935 in Kawasaki, Japan, and has evolved into a key supplier of photoresists, developing solvents, and other specialty chemicals used in semiconductor manufacturing. The company is led by President and CEO Kazuhiro Chiba, who oversees operations from its headquarters in Kawasaki. Its wealth origin is rooted in industrial chemical production, and it remains a public company traded on the Tokyo Stock Exchange (ticker: 4186). TOK's primary business involves manufacturing photoresists for photolithography, a critical step in semiconductor fabrication. The company also produces materials for flat-panel displays, printed circuit boards, and advanced packaging. Its product portfolio includes positive and negative photoresists, anti-reflective coatings, and various developing solutions. TOK supplies major semiconductor manufacturers globally, including in Japan, East Asia (Taiwan, South Korea), and North America (per industry reports, 2023). Recent investments have focused on expanding production capacity for extreme ultraviolet (EUV) lithography materials. As a public company, TOK does not disclose AUM or deployment metrics in the manner of an investment firm. In 2024, the company reported annual revenue of approximately ¥180 billion (per financial filings, 2024). TOK operates multiple manufacturing sites in Japan and overseas, including facilities in Taiwan and South Korea. Its ADR program allows US investors to trade shares over-the-counter. No philanthropic or family office structures are publicly disclosed. TOK's structural differentiator is its focus on niche, high-purity chemical manufacturing for the semiconductor industry, where it holds a significant market share in photoresists. Its longevity since 1935 and adaptation to technological shifts—from conventional lithography to EUV—underscore its stability. Succession and governance follow standard Japanese corporate structures, with Chiba leading as president since 2015.

## Sectors

- Industrial Tech
- Semiconductors
- Chemicals

## People

- Kazuhiro Chiba — President and CEO

## Questions

### What does Tokyo Ohka Kogyo produce?

TOK manufactures photoresists, developing solutions, and other specialty chemicals used in semiconductor lithography, flat-panel displays, and printed circuit boards. Its products are critical for EUV and other advanced lithography processes.

### How does TOK invest in research and development?

TOK allocates a portion of its revenue to R&D, focusing on new materials for EUV lithography and advanced semiconductor nodes. The company has invested in expanding production capacity at its plants in Japan and Taiwan (per financial filings, 2024).

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

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