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4042 on Tokyo Stock Exchange

Tosoh

Logo: Unknown author Unknown author, Public domain, via Wikimedia Commons4

Japanese chemical company

Tosoh Corporation (東ソー株式会社, Tōsō Kabushiki-gaisha) is a global chemical and specialty materials company. The company was founded in 1935 in Yamaguchi Prefecture, as Toyo Soda Manufacturing Co., Ltd., and changed its name to Tosoh Corporation in 1987. Today, its corporate headquarters are in Tokyo, Japan.2 Its shares trade on Tokyo Stock Exchange under the symbol 4042.1 Wikipedia text CC BY-SA 4.0

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Last updated Oct 21, 2026.

Overview

Feb 11, 1935Founded1

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  • Ticker4042 on Tokyo Stock Exchange1
  • HeadquartersTokyo1
  • Websitewww.tosoh.com/home
  • Legal formkabushiki gaisha1
  • LEI529900YSLFVJF2MDBX023
  • StatusActive3
  • LEI statusLapsed (not renewed)3
  • Registered address開成町４５６０番地, 746-8501 周南市, Japan3
  • Registered withNational Tax Agency, 52500010100023

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Tosoh Corporation (東ソー株式会社, Tōsō Kabushiki-gaisha) is a global chemical and specialty materials company. The company was founded in 1935 in Yamaguchi Prefecture, as Toyo Soda Manufacturing Co., Ltd., and changed its name to Tosoh Corporation in 1987. Today, its corporate headquarters are in Tokyo, Japan.2

Corporate structure

Tosoh sits at the top of its group. 2 entities, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries, stakes and holdings from Wikidata (CC0). Each entity in the chart links to its source.

Products and brands

  • indium tin oxide

Listed on Wikidata.1

Tosoh Corporation is divided into 13 business divisions organized into five groups: Petrochemical, Chlor-Alkali, Speciality, Engineering, and a fifth group composed of support services, including logistics, construction, engineering support, and other support activities. Listed below are the five groups and their primary products:

Petrochemical Group

Olefins: ethylene, propylene and polypropylene, tert-Butanol, and aromatics.

Polymers: LDPE, LLDPE, HDPE, synthetic rubber, polychloroprene rubber, etc.

Read the full text

Chlor-Alkali Group

Basic Chemicals: calcium hypochlorite, sodium hydroxide, chlorinated paraffins, sodium bicarb, vinyl chloride monomer, and polyvinylchloride.

Methylene diphenyl diisocyanate (MDI).

Cement: Portland cement, blast-furnace slag cement, and fly ash cement.

Specialty Group

Organic Chemicals: organic intermediates, ethyleneamines, flame retardants, polyurethane catalysts, benzyl alcohol, hydrocarbon based solvents, piperazine, sodium styrene sulfonate, and bromochloropropane(BCP).

Advanced Materials: silica glass, sputtering deposition targets, zeolites, zirconia injection mold and grinding media, battery materials, and silica.

Bio-science: automated immunoassay and glycohemoglobin analyzers, high-performance liquid chromatography (HPLC), molecular analyzers, chromatographic resins, size-exclusion chromatography instruments, laboratory automation solutions and services, and reagents.

The Specialty Group focuses on products for high-tech industries such as semiconductors, consumer electronics, pharmaceuticals, and healthcare.

Engineering Group

Water Treatment

Other Services Group

Analytical Services

Information Technology

Personnel Management

Logistics

From Wikipedia’s article on Tosoh, shared under CC BY-SA 4.0.5

Subsidiaries and ownership

Subsidiaries

From Wikidata.1

Timeline

  1. May 16, 1949Went public Listed on Tokyo Stock Exchange1
  2. Feb 11, 1935Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

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