Nihon Seiko

What Nihon Seiko does

Nihon Seiko Co., Ltd. (日本精鉱株式会社) is a publicly traded Japanese specialty chemicals manufacturer founded in 1935 and headquartered in Shinjuku, Tokyo. The company is Japan's leading supplier of antimony compounds, holding approximately 70% domestic market share for antimony trioxide, which it sells primarily as a flame retardant synergist for plastics, fibers, and materials used in automotive, home appliance, industrial machinery, and housing applications. Its product portfolio spans eight core antimony compounds — trioxide, trioxide special-processed variants, metallic antimony, sodium antimonate, trisulfide, pentasulfide, trichloride, and pentachloride — supplemented by complex flame retardants, the proprietary SULMICS metal sulfide series, and development-stage antimony tetroxide.

The company's core technology combines antimony smelting and refining expertise with water atomization for metal powder production through its wholly-owned subsidiary Japan Atomize Processing Co., Ltd. (日本アトマイズ加工株式会社), which manufactures copper, iron alloy, and bronze powders serving multilayer ceramic capacitors, power inductors, and precision motor bearings in automotive and consumer electronics applications. Operations are anchored at the Nakase Smelting Works (中瀬製錬所) in Yabu City, Hyogo Prefecture, on the historic site of the Nakase Gold Mine, recognized as a Japan Heritage site in 2017. Nihon Seiko also operates a wholly-owned China subsidiary (Nikusei Shoko / Nichu Seikou Shoubou, 日鋳精鉱商貿有限公司) for international sales and raw material procurement, plus a small agribusiness (minori farm) producing high-brix tomatoes.

The company operates a B2B sales-led go-to-market, supplying industrial manufacturers through direct sales and route sales teams with quote-based pricing. Its medium-term management plan targets consolidated operating profit of ¥30 billion+ average over FY2025-2028 and ROE of 10%+, while positioning 2035 (its 100th anniversary) as a "Second Founding." The company maintains ISO 9001 and ISO 14001 certifications, holds membership in the Japan Flame Retardant Association (FRCJ) and International Antimony Association (i2a), and is led by President and Representative Director Ueda Noritaka (植田憲高).

Name

Nihon Seiko

Legal name

Nihon Seiko Co., Ltd. (日本精鉱株式会社)

Website

https://nihonseiko.co.jp

Company type

Public

Founded year

1935

Operating status

Operating

Headcount range

101–250 employees

Short description

Nihon Seiko Co., Ltd. (日本精鉱株式会社) is a publicly traded Japanese specialty chemicals manufacturer (founded 1935) holding approximately 70% domestic market share for antimony trioxide, supplying flame retardant, catalyst, and metal powder applications to automotive, electronics, home appliance, industrial machinery, and construction customers, with water-atomized metal powders produced via subsidiary Japan Atomize Processing.

Ownership category

akta.pro rank

Product category

Specialty Industrial Chemicals (Antimony Compounds)

NAICS

Chemical Manufacturing (325), Nonferrous Metal (except Aluminum) Smelting and Refining (33141), Other Basic Inorganic Chemical Manufacturing (325180)

SIC

Industrial Inorganic Chemicals (2810), Primary Smelting & Refining Of Nonferrous Metals (3330)

akta.pro primary industry

Catalysts & Adsorbents (IMAEABAB)

akta.pro secondary industries

Flame-Retardant & Smoke-Suppressant Compounds (IMANABAG), Chemical Synthesis Catalysts (Hydrogenation/Oxidation/Acid-Base) (IMAEAIAD)

Keywords

• Antimony compounds
• Flame retardant materials
• Metal powders
• Specialty chemicals
• Smelting and refining

Headquarters

HQ city

Toshima

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Antimony Products: Manufacture and sale of antimony compounds including trioxide, metal antimony, sodium antimonate, trisulfide, pentasulfide, trichloride, and pentachloride for flame retardants, catalysts, pigments, friction materials, and glass clarification.
2. Metal Powders: Sale of metal powders (copper, iron alloy, bronze) produced by subsidiary Japan Atomize Processing via water atomization for electronic components, inductors, and powder metallurgy applications.
3. Agriculture Business: Subsidiary minori farm operation growing high-brix tomatoes at Nakase Smelting Works location.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

Nihon Seiko manufactures and sells specialty antimony compounds—including antimony trioxide, metallic antimony, sodium antimonate, trisulfide, pentasulfide, trichloride, and pentachloride—for flame retardants, catalysts, pigments, friction materials, and glass clarification applications. The company also produces the proprietary SULMICS metal sulfide series, complex flame retardants, and—through its subsidiary Japan Atomize Processing—water-atomized metal powders (copper, iron alloy, bronze) used in multilayer ceramic capacitors, power inductors, and powder metallurgy for automotive and electronic components.

Product overview

Nihon Seiko is a specialized chemical materials company and Japan's leading supplier of antimony compounds. The company operates as a single-brand portfolio centered on antimony chemistry, offering eight distinct antimony compounds (trioxide, trioxide special processed, metallic antimony, sodium antimonate, trisulfide, pentasulfide, trichloride, and pentachloride) as core products. The flagship product, antimony trioxide, serves as a flame retardant for plastics, fibers, and materials used in automotive, home appliance, industrial machinery, and housing sectors, commanding approximately 70% domestic market share in Japan. The company also produces metal sulfides under the SULMICS brand and complex flame retardants. Through its subsidiary Japan Atomize Processing Co., Ltd., the company offers various metal powders (copper, iron alloy, bronze) for electronic components and powder metallurgy applications. A development-stage product, antimony tetroxide, is also in the pipeline.

Differentiator

Problem solved

Functional benefit

Brands

• SULMICS (サルミクス): Metal sulfide series developed by Nihon Seiko for various industrial applications.
• Antimony Tetroxide (四酸化アンチモン)

Products and services

• Antimony Trioxide (三酸化アンチモン) Primary flame retardant synergist additive used in plastics, fibers, and various materials for automotive, home appliance, industrial machinery, and housing applications. Nihon Seiko holds approximately 70% domestic market share in Japan for this product.
• Antimony Trioxide Special Processed Products (三酸化アンチモン特殊加工品) Specially processed variants of antimony trioxide engineered to meet specific application requirements for industrial customers.
• Metallic Antimony (金属アンチモン) Pure metallic antimony used in various industrial applications including lead-acid battery electrodes and semiconductor materials.
• Sodium Antimonate (アンチモン酸ソーダ) Sodium antimonate compound used in specialty chemical applications for industrial customers.
• Antimony Trisulfide (三硫化アンチモン) Antimony trisulfide compound used in various industrial and chemical applications.
• Antimony Pentasulfide (五硫化アンチモン) Antimony pentasulfide compound for specialized industrial applications.
• Antimony Trichloride (三塩化アンチモン) Antimony trichloride compound used in chemical synthesis and industrial processes.
• Antimony Pentachloride (五塩化アンチモン) Antimony pentachloride compound for specialized industrial applications.
• SULMICS Series Metal Sulfides (金属硫化物) Proprietary SULMICS-branded metal sulfide compounds developed by Nihon Seiko for various industrial applications, including friction materials and specialty chemicals.
• Complex Flame Retardants (複合難燃剤) Composite flame retardant formulations that combine multiple flame retardant components for tailored fire-safety performance in plastics, fibers, and other materials.
• Metal Powder Products (金属粉末製品) Water-atomized metal powders manufactured by subsidiary Japan Atomize Processing Co., Ltd. Includes copper powder for multilayer ceramic capacitor electrodes, iron alloy powder for power inductor coil materials, and bronze powder for small motor bearing powder metallurgy used in automotive and communication equipment precision electronic components.
• Antimony Tetroxide (四酸化アンチモン) Antimony tetroxide compound under development for advanced applications including emerging uses in batteries and semiconductor materials.

Quantifiable outcome

• Approximately 70% domestic market share in antimony trioxide sales in Japan
• +1 more outcomes

Named customers5 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

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, strategic, industry and international.

• Japan Atomize Processing Co., Ltd. (日本アトマイズ加工株式会社)coreOthersWholly-owned subsidiary producing metal powders using water atomization technology for electronic components, inductors, and powder metallurgy applications. Acquired in 2000 and fully consolidated.
• Nichu Seikou Shoubou (日銲精礦商貿有限公司)strategicOthersOverseas subsidiary in China handling antimony product sales and raw material procurement in the Chinese market.
• Japan Flame Retardant Association (FRCJ)industryStrategic or Co-development PartnerIndustry association for flame retardant materials. Nihon Seiko participates in activities to verify safety of flame retardants from scientific perspectives and promote healthy industry development.
• International Antimony Association (i2a)internationalStrategic or Co-development PartnerInternational non-profit organization conducting research and providing information on safety and utility of antimony trioxide. Nihon Seiko participates as a member company.

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• ICL Group: Israel-based specialty chemicals and fertilizer major with a sizable flame retardant and bromine-based additives franchise. Comparable as a broader incumbent competing for the same flame retardant and industrial additive spend that Nihon Seiko addresses with antimony trioxide.
• Lanxess: German specialty chemicals group with flame retardant and additive product lines serving plastics, electronics, and construction. Overlaps with Nihon Seiko in flame-retardant chemistries and industrial customers, but operates at much larger scale across many chemistries.
• BASF: Global chemical major with broad flame retardant, pigment, and catalyst offerings including antimony trioxide. Competes indirectly with Nihon Seiko across the same end-use segments, providing the scale and R&D backdrop against which a niche leader like Nihon Seiko must defend its share.

Direct peers

• Campine: Belgium-based specialty chemicals company and one of the few other dedicated producers of antimony trioxide for flame retardant applications. Direct overlap with Nihon Seiko in antimony trioxide supply to plastics, textile, and electronics customers globally.
• Dowa Holdings: Japanese non-ferrous metals and electronic materials group with operations in metal recycling and antimony-related materials. Closely comparable as a Japan-headquartered counterpart active in non-ferrous metals, electronic materials, and downstream specialty compounds.
• Mitsui Mining & Smelting: Japanese non-ferrous metals and functional materials producer with smelting, electronic materials, and automotive parts businesses. Comparable as a Japanese smelter/refiner with overlapping exposure to non-ferrous metals, electronic materials, and metal powders.
• Masan High-Tech Materials: Vietnam-listed producer of tungsten, antimony, and other critical metals with downstream advanced materials. Directly comparable as an integrated antimony/fluorspar mining and refining business supplying industrial customers globally.
• NYACOL Nano Technologies: US-based producer of antimony-based and other metal oxide compounds for flame retardant and catalyst applications. Comparable niche competitor in the antimony compound supply chain serving plastics, textiles, and industrial customers.
• AMG Advanced Metallurgical Group: Netherlands-listed specialty metals producer whose portfolio includes antimony and other critical metals used in flame retardants, alloys, and advanced materials. Comparable as a vertically integrated specialty metals and compounds supplier serving similar industrial end markets.

Others

• Sumitomo Metal Mining: Japanese non-ferrous metals major that historically operated an antimony oxide business transferred to Nihon Seiko in 2003. Relevant as the originating counterparty for Nihon Seiko's antimony oxide franchise and a broader non-ferrous metals peer in the Japanese market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

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Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries2 records

Funding overview

Funding rounds1 record

Investors1 record

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

M&A

Investments

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

Frequently asked questions about Nihon Seiko