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Resonac Corporation (Formerly Showa Denko Materials Co., Ltd.)

Summary

Covers Resonac Corporation exhibition participation, products, technologies, and major customers. Offers exclusive information available only on MarkLines to support research and analysis in the automotive industry.

Company Profile

■URL

https://www.resonac.com/

■Address

Tokyo Shiodome Building, 1-9-1 Higashishinbashi, Minato-ku, Tokyo 105-7325, Japan

Business Overview

-Resonac, a major chemical manufacturers, was formed out of the 2023 merger of Showa Denko and Showa Denko Materials (formerly Hitachi Chemicals)

-The Group operates under a holding-company system.

  • Reconac Holdings Co., Ltd. (Formerly Showa Denko Co., Ltd.)
  • Resonac Co., Ltd. (Operating company formerly named Showa Denko Materials Co., Ltd.)

-The Company operates in the following four business segments

Segment
Business details
Semiconductors/electronic materials Front-end materials for semiconductors High-purity gases for electronic materials; polishing materials (CMP slurry) for semiconductor circuit planarisation
Back-end-of-line materials for semiconductors Epoxy encapsulants, die-bonding materials, copper-clad laminates, photosensitive films, photosensitive solder resist
Device Solutions HD media, SiC epitaxial wafers
Mobility Plastic mouldings
Friction materials
Powder metallurgy products
Aluminium structural components
Innovation materials Plastic materials
Functional chemicals (synthetic resin emulsions, unsaturated polyester resins)
Coating materials
Ceramics (alumina, grinding and polishing materials, fine ceramics)
Chemicals Chemicals Basic chemicals (liquid ammonia, acrylonitrile, amino acids, caustic soda, chlorine, synthetic rubber)
Industrial gases (liquefied carbon dioxide, dry ice, oxygen, nitrogen, hydrogen)
Graphite Graphite electrodes, carbon anode materials

Shareholders

-Resonac Holdings listed on the Prime Market of the Tokyo Stock Exchange (As of Dec. 31, 2025)
Major Shareholders Shareholding (%)
The Master Trust Bank of Japan, Ltd. (Trust account) 17.33
Custody Bank of Japan, Ltd. (Trust account) 8.79
STATE STREET BANK AND TRUST COMPANY 505001 (Standing proxy Mizuho Bank, Ltd.) 4.79
STATE STREET BANK AND TRUST COMPANY 505223 (Standing proxy Mizuho Bank, Ltd.) 3.18
JPMorgan Securities Japan Co., Ltd. 3.15
Fukoku Mutual Life Insurance Company 2.49
BNYM SA/NV FOR BNYM FOR BNYM GCM CLIENT ACCTS M ILM FE(Standing proxy MUFG Bank, Ltd.) 2.19
STATE STREET BANK AND TRUST COMPANY 505103 (Standing proxy Mizuho Bank, Ltd.) 1.98
GOLDMAN SACHS JAPAN CO., LTD. BNYM 1.69
JP MORGAN CHASE BANK 385781 (Standing proxy Mizuho Bank, Ltd.) 1.46
Total 47.05

Products

Molded Plastics/Sheet-formed Products
High-strength resin gears

Thermoset resin molded parts
- Impellers
- Toothed pulleys
- Thermal insulation spacers
- Phenolic SMC molded parts

Thermoplastic resin moulded parts
- Small precision molded parts
- Injection-welded molded parts
- Insert molded parts
- Glass fiber reinforced thermoplastic resin products

Thermoplastic resin sheets
- Olefin-based
- Styrene-based
- Multi-layer sheets
- Film laminates

 

Friction material
Disc brake pads

 

Sintered Products
Sintered oil-impregnated bearings
- Bearings suitable for low speeds and high contact pressures
- Iron-copper alloy bearings
- Special-shaped bearings

Sintered mechanical components and magnetic components
- High-strength materials
- Materials with high machinability
- Heat- and wear-resistant materials for valve systems
- High-temperature oxidation- and wear-resistant materials
- Sintered stainless steel materials
- Soft magnetic materials

 

Aluminum Products
Scrolls for electric compressors

Power semiconductor coolers

Heat sinks
- Skived heat sinks
- Extruded heat sinks

Forged aluminum suspension components

Precision-sliced parts

History

Corporate structure changed from a limited stock company to a holding company

-On January 1, 2023, Showa Denko Materials Co., Ltd. merged with Showa Denko Co., Ltd. As a result, the new company was named Resonac. The former Showa Denko changed its trade name to Resonac Holdings Corporation, operating as a a holding company, and the former Showa Denko Materials changed its trade name to Resonac Corporation, doing business as an operating company.

Apr. 2020 Showa Denko turned Hitachi Chemicals into a consolidated subsidiary.
Oct. 2020 Hitachi Chemic

 

Resonac Holdings History (Formerly Showa Denki Co., Ltd.)

Dec. 1908 Established Sobo Marine Products Co., Ltd. for the purpose of manufacturing and selling iodine
Apr. 1921 Established Takada Aluminum Equipment Manufacturing Co., Ltd. (later named Showa Aluminum Co., Ltd.)
Oct. 1926 Established Nihon Iodine Co., Ltd.
Oct. 1928 Established Showa Fertilizers
Mar. 1934 Renamed Japan Iodoine to Nihon Showa Kogyo Co., Ltd.
Nov. 1937 Established Riken Kohaku Co., Ltd. (later Showa Hipolymer Co., Ltd.)
Jun. 1939 Established Showa Denko from both Showa Denki. and Showa Fertilizers
May 1949 Listed on the Tokyo Stock Exchange
Oct. 1962 Established Hitachi Chemical Industry (later renamed to Hitachi Chemicals)
Feb. 1966 Established Chidori Kogyo (currently Kanagawa Business Office)
Apr. 1969 Launch of commercial operations at Oita Petrochemical Complex.
Jul. 1988 Acquired the graphite electrode business from the B.O.C Group in the United States, and established Showa Denko Carbon, Inc. (currently Resonac Graphite America Inc.)
Mar. 2001 Merged with Showa Aluminum Co., Ltd.
Jan. 2003 Acquired the hard-disc business from Mitsubishi Chemicals Group (currently Resonac HD Singapore Pte. Ltd.)
Jul. 2003 Listed as one business on the Tokyo Stock Exchange
Jul. 2004 Invested in Trace Storage Technology of Taiwan, a hard-disc manufacturer, turning it into a consolidated subsidiary (currently Showa Denko HD Trace Corporation)
Jul. 2009 Acquired the hard disk business of Fujitsu Limited (currently Resonac HD Yamagata Co., Ltd.)
Dec. 2009 Turned Showa Gas Co., Ltd. into a wholly owned subsidiary (currently Resonac Gas Products).
Jul. 2010 Merged Showa Hipolymer Co., Ltd.
Sep. 2016 Turned Sun Aroma Co., Ltd., a Synthetic resin polypropylene business, into a consolidated subsidiary
Oct. 2017 Acquired SGL GE Holding GmbH engaged in the graphite electrode business (currently Resonac Europe GmbH)
2020 Acquired Hitachi Chemicals and changed the name to Showa Denko Materials Co., Ltd.
Apr. 2022 Moved from the 1st Section to the Prime Market of the Tokyo Stock Exchange due to the TSE's reorganization.
Jan. 2023 Adopted the corporate name Resonac Holdings, after changing to a holding company. The name of Showa Denko Materials, a consolidated subsidiary, was changed to Resonac. And inherited all of Showa’s businesses.
Jan. 2025 Crasus Chemical Inc. acquired the petrochemical business and commenced operations. (Crasus Chemical is a subsidiary, which was established in August 2024.)
Dec. 2025 Resonac Corporation, transferred all stock shares of FIAMM Energy Technology to Aurelius Investment Lux Sixteen.
Apr. 2026 Resonac Corporation, transferred the automotive molding materials businesses in Japan and Thailand to Moriroku Co, Ltd.

Supplemental Information 1

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