History
| Mar. 1938 | Established in present Katsushika-ku, Tokyo, with capital of 400,000 yen. Started manufacturing metal working fluid. |
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| Jan. 1947 | Started manufacturing textile auxiliaries. |
| Mar. 1950 | Opened the Nagoya office in the city of Nagoya. |
| Jan. 1952 | Succeeded in technical development of emulsifiers and spreaders for agricultural pesticides and started manufacturing them. Started manufacturing various industrial surfactants and chemical agents for paper manufacturing. |
| Nov. 1956 | Opened the Osaka office in the city of Osaka. |
| Aug. 1960 | Newly established the Oppama Plant in Yokosuka-shi, Kanagawa. |
| Jan. 1961 | Started manufacturing emulsifiers for synthetic rubber emulsion polymerization and synthetic resin products. |
| Feb. 1962 | Successfully completed development of manufacturing techniques of solvent ethylene glycol monobutyl ether and began first domestic production in Japan. |
| May. 1962 | Listed on the second section of Tokyo Stock Exchange. |
| May. 1964 | Newly established the Technical Laboratory in Yokosuka-shi, Kanagawa (currently Oppama Laboratory). |
| Mar. 1965 | Acquired the stocks of the manufacturer of paper manufacturing chemical agents Kindai Chemical Industry Co., Ltd. and made it a subsidiary company (currently a consolidated subsidiary). |
| Jul. 1965 | Newly established the Tokuyama Plant in Tokuyama-shi (currently Shunan-shi), Yamaguchi and started manufacturing emulsifiers for synthetic rubber emulsion polymerization. |
| Oct. 1967 | Established a new subsidiary company Toho Petroleum Resin Co., Ltd. Built the Yokkaichi Plant in the Yokkaichi waterfront industrial area and started manufacturing petroleum resins. |
| Jun. 1969 | Newly established the Surfactant Laboratory in Katsushika-ku, Tokyo (currently the Chiba Laboratory after relocation). |
| Aug. 1970 | Established the new subsidiary company Toho Chiba Chemical Industry Co., Ltd. Built the Sodegaura Plant in the Keiyo waterfront industrial area and started manufacturing surfactants. |
| Oct. 1975 | Started manufacturing polyethers in the subsidiary Toho Chiba Chemical Industry Co., Ltd. |
| Jun. 1978 | Established the new subsidiary company Yokosuka Environmental Technology Center and started business of testing and analysis for environmental assessment (currently a consolidated subsidiary). |
| Apr. 1979 | Constructed an up-and-coming factory in the Oppama Plant and implemented mass-production systems of solvents, crude oil chemicals, and lubricant additives. |
| Sep. 1986 | Newly installed production facilities for cationic cellulose at the Tokyo Plant. |
| Dec. 1987 | Newly installed continuous sulfonation equipment at the Sodegaura Plant of the subsidiary Toho Chiba Chemical Industry Co., Ltd. |
| Oct. 1988 | Merged the subsidiary Toho Petroleum Resin Co., Ltd. (currently the Yokkaichi Plant). |
| Mar. 1989 | Increased capital via a public offering of 2 million shares (Capital: 1,755 million yen). |
| Oct. 1990 | Constructed a new research building in the city of Yokosuka, Kanagawa Prefecture. |
| Oct. 1993 | Merged the subsidiary Toho Chiba Chemical Industry Co., Ltd. (currently the Chiba Plant) |
| Mar. 1994 | Established the new joint venture company Toho Huaiji Forest Chemical Co., Ltd. (currently a consolidated subsidiary Toho Huaiji Chemical Co., Ltd.) |
| Jun. 1995 | Moved the Tokyo Plant to the Chiba Plant for integration and added a fine chemical plant in the premise. |
| Jul.1996 | Moved the Head office to Akashi-cho, Chuo-ku, Tokyo. |
| May. 1998 | Constructed a pilot plant at the Oppama Laboratory. |
| Jan. 1999 | Newly installed production facilities for electronics and IT materials at the Chiba Plant. |
| Feb. 1999 | Established the subsidiary Toho Chemical Warehousing Co., Ltd. (currently a consolidated subsidiary). |
| Dec. 1999 | Acquired ISO 9001 certification (JQA-QM4007). |
| Feb.2000 | Established the joint venture company Toho Chemical (Thailand) Co., Ltd. in Bangkok, Thailand (Current location: Samut Prakan Province). |
| Dec. 2001 | Acquired ISO 14001 certification (JQA-EM1969). |
| May. 2005 | Established the Shanghai representative office of Toho Chemical Industry of Japan Co., Ltd. , in Shanghai, China. |
| Apr. 2007 | Inherited the business of the sales and research departments from the subsidiary Kindai Chemical Industry Co., Ltd. |
| Feb. 2008 | Added production facilities for electronics and IT materials at the Chiba Plant. |
| Nov. 2008 | Reorganized the Shanghai representative office in Shanghai, China, and established Toho Chemical Shanghai Co., Ltd. (currently a consolidated subsidiary). |
| Apr. 2009 | Constructed the Kashima Plant in the Kashima area (city of Kamisu), Ibaraki Prefecture. Started manufacturing surfactants. |
| Jul. 2010 | Established the new subsidiary company Toho Chemical Industry Shanghai Co., Ltd., in Shanghai, China (currently a consolidated subsidiary). |
| Jun. 2011 | Established the subsidiary of Toho Huaiji Chemical Co., Ltd., in Guangdong province, China, named Toho Huizhou Chemical Co., Ltd. |
| Jul. 2011 | Added production facilities for surfactants at the Chiba Plant. |
| Mar. 2012 | Expanded electronic information material production facilities at the Chiba Plant. |
| Apr. 2014 | Commenced commercial production at our subsidiary TOHO CHEMICAL INDUSTRY SHANGHAI CO., LTD. |
| Jul. 2014 | Commenced commercial production at TOHO HUIZHOU CHEMICAL CO., LTD., a subsidiary of TOHO HUAIJI CHEMICAL CO., LTD. | Mar. 2017 | Expanded electronic information material purification facilities at the Chiba Plant. | May. 2019 | Expanded electronic information material purification facilities at the Chiba Plant. |
| Jul. 2020 | Merged with our subsidiary TOHO CHEMICAL Warehousing CO., LTD. |
| Aug. 2020 | Expanded production facilities at our subsidiary TOHO CHEMICAL INDUSTRY SHANGHAI CO., LTD. |
| Dec. 2021 | Construction of electronic information material resin factory at the Chiba Plant. |
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