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- The House of Sumitomo establishes an independently managed fertilizer plant at Niihama, Ehime prefecture.
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- Operations commence and the first shipment of calcium superphosphate fertilizer leaves the plant.
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- Sumitomo Fertilizer Manufacturing Co., Ltd. is incorporated with operations at what is now the Ehime Works.
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- Sumitomo Fertilizer Manufacturing changes its name to Sumitomo Chemical Co., Ltd.
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- Sumitomo Chemical acquires Japan Dyestuff Manufacturing Company, diversifying into dyestuffs and pharmaceuticals at the present-day Osaka Works and Oita Works.
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- Sumitomo Chemical takes over the aluminum business of Sumitomo Aluminium Smelting Co., Ltd.
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- Sumitomo Chemical starts production of ethylene and its derivatives, diversifying into the petrochemical business at its Ehime Works.
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- The Takatsuki Research Laboratory is completed, serving as the Company's central laboratory (closed in March 2003).
- Sumitomo Chiba Chemical Co., Ltd. is established and is fully acquired in 1975 at the present-day Chiba Works.
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- The Takarazuka Research Center is established to reinforce research and development activities for pharmaceuticals and agricultural chemicals.
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- The aluminum operation is transferred to the newly formed Sumitomo Aluminium Co., Ltd., subsequently dissolved in 1986.
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- The Misawa Works is opened to expand production of pyrethroid household insecticides.
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- P.T. Indonesia Asahan Aluminium starts operations.
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- Sumitomo Chemical suspends ethylene and derivitives production at its Ehime Works and concentrates production at its Chiba Works.
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- Sumitomo Pharmaceuticals Co., Ltd. is established by consolidating the pharmaceutical operations of Sumitomo Chemical and Inabata & Co., Ltd. and commences operation the same year.
- The petrochemical complex in Singapore begins operations.
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- The Biochemistry & Toxicology Laboratory, subsequently renamed the Environmental Health Science Laboratory, is established at the Osaka Works.
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- The Tsukuba Research Laboratory is established.
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- The petrochemical complex in Singapore commences operation of its second phase expansion project, bringing the total ethylene capacity to one million tons per year.
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- Facilities in Singapore for the manufacture of acrylic acid and its derivatives, including methyl methacrylate resins, are completed.
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- Sumitomo Chemical establishes Genomic Science Laboratory, operated jointly with Sumitomo Pharmaceuticals.
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- Sumitomo Chemical establishes the IT-related Chemicals Sector as a new business sector, giving it 6 Business Sectors, comprising Basic Chemicals, Petrochemicals & Plastics, Fine Chemicals, Agricultural Chemicals, and Pharmaceuticals.
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- Sumitomo Chemical Takeda Agro Co., Ltd., a joint venture between Sumitomo Chemical and Takeda Chemical Industries, Ltd., succeeds Takeda Chemical's agrochemical business and commences operation (fully acquired in 2007).
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- Sumitomo Chemical opens a plant for the integrated production of LCD polarizing film at its subsidiary Dongwoo Fine-Chem Co., Ltd. in Korea and commences operation.
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- Sumitomo Chemical opens a plant for the integrated production of polarizing film for LCD displays at its subsidiary Sumika Technology Co., Ltd. in Taiwan.
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- Sumitomo Chemical establishes equally owned joint venture Rabigh Refining and Petrochemical Company (Petro Rabigh) together with Saudi Aramco.
- Sumitomo Pharmaceuticals and Dainippon Pharmaceutical merge to form Dainippon Sumitomo Pharma.
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- Sumitomo Chemical acquires UK company Cambridge Display Technology, a pioneer in the development of polymer organic LEDs and related devices, and makes it a wholly owned subsidiary.
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- Petro Rabigh's integrated refining and petrochemical complex starts operation of its ethane cracker, its core plant.
- Dainippon Sumitomo Pharma acquires US pharmaceuticals company Sepracor Inc. (now Sunovion Pharmaceuticals Inc.)
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Specialty Chemicals 
Tokyo Sumitomo Twin Building (East), 27-1, Shinkawa 2-chome, Chuo-ku
