What Tokyo Ohka Kogyo does

Tokyo Ohka Kogyo Co., Ltd. (TOK) is a Japan-based specialty chemicals company that manufactures and sells semiconductor photoresists and ancillary process chemicals used in wafer fabrication, advanced packaging, and image sensor/MEMS production. Founded in 1940 and headquartered in Kawasaki, the company has held the world No. 1 position in semiconductor photoresists with a 24.7% global market share, including leading positions in EUV (28.0%) and KrF (32.4%) resists. Its product portfolio spans the full lithography wavelength range — EUV, ArF (including immersion), KrF, and G/I-line photoresists — alongside back-end packaging materials (bump formation, RDL formation, liftoff, dry/wet etching photoresists), developers, thinners, strippers, microlenses, DSA materials, and reflective multilayer coatings.

TOK's competitive position rests on two proprietary technology platforms: fine processing technology and high-purification chemistry, supported by the proprietary Multi-Trigger Resist platform developed in partnership with Irresistible Materials for next-generation EUV lithography. The company sells direct to enterprise semiconductor manufacturers, with named customers including Intel, Samsung Electronics, and SK Hynix, and operates manufacturing or sales operations across seven countries — Japan, Taiwan, South Korea, China, the United States, Italy, and the Netherlands — including major production facilities at the Koriyama Plant and recently commissioned sites at Aso Kumamoto and a planned facility near Seoul for 2nm chip supply.

TOK is publicly listed on the Tokyo Stock Exchange (Ticker: 4186) with no parent company and no controlling shareholder. FY2025 net sales reached ¥237.0 billion (+17.9% YoY) with operating income of ¥47.4 billion (+43.2%), driven primarily by AI-related semiconductor materials demand, and management is guiding FY2026 revenue of ¥261.0 billion supported by ¥35.8 billion of capital expenditure earmarked for next-generation EUV photoresists and advanced packaging materials. Revenue is generated through direct B2B sales of consumable photoresist chemicals rather than licensing or subscription models; pricing is not publicly disclosed and reflects long qualification cycles and embedded customer relationships rather than transactional pricing.

Name

Tokyo Ohka Kogyo

Legal name

Tokyo Ohka Kogyo Co., Ltd.

Website

http://www.tok.co.jp

Company type

Public

Founded year

1936

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Tokyo Ohka Kogyo (TOK) is the world leader in semiconductor photoresists, holding 24.7% global share, and supplies EUV, ArF, KrF, and G/I-line resists plus packaging chemicals to semiconductor manufacturers including Intel, Samsung, and SK Hynix across a seven-country manufacturing footprint.

Ownership category

akta.pro rank

Product category

Semiconductor Materials

NAICS

Photographic Film, Paper, Plate, Chemical, and Copy Toner Manufacturing (325992)

SIC

Miscellaneous Chemical Products (2890)

akta.pro primary industry

Photoresists & Lithography Chemicals (Resists/Developers/Anti-Reflective Coatings) (HDAHAGAE)

akta.pro secondary industry

Photoresists & Lithography Materials (Resists, Developers, Strippers) (IMAEAKAB)

Keywords

• Semiconductor photoresists
• Lithography chemicals
• Wafer fabrication materials
• EUV lithography materials
• Semiconductor process chemicals

Headquarters

HQ city

Kawasaki

HQ country

Japan

HQ region

Asia

Offices7 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Technology or R&D, Operations, Personnel, Infrastructure

Revenue model

1. Semiconductor Photoresist Materials Sales: Primary revenue stream from sale of photoresist chemicals and related materials to semiconductor manufacturers. Products include EUV, ArF, KrF, and g/i-line photoresists for wafer fabrication.
2. Related Chemicals and Materials: Sale of ancillary chemicals and process materials used in semiconductor manufacturing, including development of advanced photoresist formulations with partners.

Go-to-market motion2 records

Distribution channels2 records

Marketing channels3 records

Core offering

Tokyo Ohka Kogyo (TOK) manufactures and sells high-purity photoresist materials and ancillary chemicals used in semiconductor photolithography. Its product portfolio covers front-end photoresists (EUV, ArF, KrF, g/i-line) for advanced and mature nodes, back-end packaging photoresists (bump, RDL, liftoff, etching), ancillary chemicals (developers, thinners, strippers), and materials for image sensor and MEMS manufacturing.

Product overview

Tokyo Ohka Kogyo (TOK) is a semiconductor materials company offering a comprehensive portfolio of photoresists and ancillary chemicals for semiconductor manufacturing. The product lineup includes front-end process photoresists (EUV, ArF, KrF, G/I-Line), back-end packaging photoresists (bump formation, RDL formation, liftoff, dry/wet etching), and ancillary chemicals (developers, rinse liquids, thinners, strippers). For image sensors and MEMS, TOK provides microlenses, transparent materials, photosensitive permanent films, and adhesives. TOK's core technologies are fine processing technology and high-purification technology, supporting semiconductor miniaturization from legacy nodes to cutting-edge sub-7nm EUV lithography. The company holds 24.7% global market share in semiconductor photoresists, with leading positions in EUV (28.0%), KrF (32.4%), and overall markets.

Differentiator

Problem solved

Functional benefit

Brands

• Multi-Trigger Resist (MTR): Advanced photoresist material platform developed by partnership with Irresistible Materials for EUV lithography, designed for both low-NA and high-NA EUV lithography with molecular dimensions up to 10x smaller than conventional polymer-based resists.

Quantifiable outcome

• 24.7% global market share in semiconductor photoresist products
• +2 more outcomes

Named customers3 records

Segments4 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Four partnerships are on record, tiered core and minor.

• Irresistible MaterialscoreStrategic or Co-development Partner · 1 February 2026Strategic investment and joint development partnership for EUV lithography photoresist materials. Tokyo Ohka Kogyo invested in the UK-based semiconductor photoresist developer to co-develop next-generation extreme ultraviolet lithography materials for advanced semiconductor nodes.
• IBMminorStrategic or Co-development PartnerCollaboration on solar cell manufacturing processes involving photoresist materials and processes for photovoltaic device fabrication.
• DuPontminorStrategic or Co-development PartnerAdvanced semiconductor photoresist development partnership for next-generation lithography materials for semiconductor manufacturing applications.
• Sanyo ElectricminorStrategic or Co-development PartnerCollaboration on wafer support systems involving photoresist coating and development processes for semiconductor wafer processing.

Scale indicators4 records

Recent moves13 records

Expansion highlights6 records

Direct peers

• Fujifilm Holdings: Japanese diversified materials and imaging company with a major Electronic Materials business producing photoresists, CMP slurries, and lithography materials. Direct competitor across multiple photoresist product lines and aggressive in EUV materials development.
• Merck KGaA (Performance Materials / Electronics): German science and technology company with significant semiconductor materials business including photoresists, EUV materials, and specialty chemicals. Direct competitor in EUV and advanced lithography chemistries.
• JSR Corporation: Japan-headquartered specialty chemicals and materials company with a major semiconductor photoresist business. Direct competitor to TOK across ArF, KrF, and EUV photoresist product lines, serving the same global semiconductor manufacturers.
• Shin-Etsu Chemical: Leading Japanese chemical company with a substantial semiconductor materials division including photoresists, photomask blanks, and silicon wafers. Directly competes with TOK in photoresists and adjacent semiconductor process materials.
• Sumitomo Chemical: Japanese chemical conglomerate with semiconductor photoresist business; recently merged with JSR. Combined entity creates a larger direct peer to TOK across semiconductor lithography materials.
• DuPont: US-based specialty chemicals company with semiconductor materials including photoresists (historical partner of TOK on 157nm lithography). Competes in advanced semiconductor materials and serves similar fab customers globally.

Broad incumbents

• Resonac Holdings (formerly Showa Denko): Japanese chemical and electronics materials company producing semiconductor materials including some lithography-related products. Broader portfolio across electronic materials makes it a partial competitor and industry incumbent.
• Toray Industries: Japanese diversified materials company with semiconductor-related materials including some photoresist adjacencies and electronic materials. Operates across broader specialty chemicals rather than specializing purely in photoresists.

Emerging players

• Entegris: US-based specialty materials and equipment company serving semiconductor manufacturers with process materials, filtration, and fluid handling. Overlaps with TOK in advanced semiconductor materials and serves similar customer base of fabs.

Others

• Irresistible Materials: UK-based photoresist developer and TOK's strategic partner for the Multi-Trigger Resist (MTR) platform. Not a direct competitor but a co-development partner in EUV photoresist technology, making it a key ecosystem participant.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/profile.php
• LinkedInlinkedin.com/company/tokyo-ohka-kogyo-co-ltd

Compliance9 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries7 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments6 records

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Tokyo Ohka Kogyo