In 1915 (Taisho 4), the Tokyo Electric Works was established by the Koga Company, marking the beginning of the production of caustic soda by electrolysis.
In 1917 (Taisho 6), the company was reorganized as a corporation and started as Asahi Electric Works Co., Ltd.
Adeka was established to produce chlorine and caustic soda by salt electrolysis.
Completion of Ogu Plant, Tokyo. Commenced operations.
In 1919 (Taisho 8), production of hardening oil using hydrogen began, establishing a dual‑pillar chemical industry based on soda and oils.
Started the production of hydrogenated oil.
Separated an agrochemical manufacturing department and established NIHON NOHYAKU CO., LTD.
Established in November 1928: 〒104-8386, 1-19-8 Kyobashi, Chuo-ku, Tokyo, Kyobashi OM Building: TEL 03-6361-1400
Started the manufacture of RISU BRAND Margarine.
Established KANTO DENKA KOGYO CO., LTD.
Established YOKO SANGYO CO., LTD. for the purpose of selling our products.
Established in January 1947: 〒101-0062, 2-5-12 Kanda Surugadai, Chiyoda-ku, Tokyo, NMF Surugadai Building 5F: TEL 03-3811-7191
Listed its stock on the first section of the Tokyo Stock Exchange.
1956年2月設立 : 〒168-0063 : 東京都杉並区和泉1-33-9 : TEL 03-3323-8411
Established TOKAI ELECTRO CHEMICAL CO., LTD. for the purpose of manufacturing and selling hydrogen peroxide products.
Established Kyokuyu Sangyo Co., Ltd.
Established KYOKUYU REAL ESTATE CO., LTD.
Established in July 1961: 〒116-0014, 5-48-5 Higashihiratsuri, Arakawa-ku, Tokyo, Koyo-sha Building 6F: TEL 03-6743-1000
Established ADEKA ARGUS INDUSTRY CO., LTD. for the purpose of manufacturing and selling plasticizers and stabilizers for plastics.
The trade name was changed to ADEKA ARGUS CHEMICAL CO., LTD.
Established ADEKA SWIFT CHEMICAL CO., LTD. as a joint venture with Swift of the US.
Akashi Plant in Hyogo completed.
Established in October 1967: 〒103-0023, 4-1-13 Nihonbashi Motomachi, Chuo-ku, Tokyo, Sleepy Nihonbashi Building 10F: TEL 03-3231-1761
Advanced into KASHIMA INDUSTRIAL COMPLEX. Participated in the establishment of KASHIMA CHLORINE & ALKALI CO., LTD., KASHIMA PVC MONOMER CO., LTD., KASHIMA SOUTH JOINT POWER CORP., and KASHIMA CHEMICAL CO., LTD.
Participated in the establishment of KANTO SODIUM SILICATE GLASS CO., LTD. and KASHIMA COMMON FACILITIES Co., Ltd.
Completed Kashima Plant, Ibaraki.
Established ADEKA CLEAN AID CORP. for the purpose of selling industrial detergent.
Established in April 1973: 〒101-0062, 2-5-12 Kanda Surugadai, Chiyoda-ku, Tokyo, NMF Surugadai Building 2F: TEL 03-3816-1271
Established in June 1974: 〒103-0001, 14-4 Kojimachi, Nihonbashi, Chuo-ku, Tokyo, Okatani Building: TEL 03-3808-2281
Completed AS Kasei CO., LTD. Sodegaura Plant, Chiba. (Now, known as Chiba Plant)
Established ACR CO., LTD. and TOKYO ENVIRONMENTAL MEASUREMENT CENTER CO., LTD.
1977年9月設立 : 〒116-0012 : 東京都荒川区東尾久8-5-2 : TEL 03-3895-1141
Established CO-OP CLEAN CO., LTD.
Kuki Plant completed. (closed in 1996)
Established in February 1979: 〒104-0033, 1-25-9 Shinagawa, Chuo-ku, Tokyo, Shinagawa City Building 1F: TEL 03-6275-2391
1979年7月設立 : 〒537-0024 : 大阪府大阪市東成区東小橋1-11-10 : TEL 06-6977-6655
Participated in the establishment of MIZUSHIMA PLASTICIZER CO., LTD. for the purpose of manufacturing special plasticizer.
Established ASAHI DENKA（SINGAPORE）PTE.LTD. in Singapore. (now changed company name to ADEKA（SINGAPORE）PTE.LTD.)
Established CHANG CHIANG CHEMICAL CO., LTD. in Taiwan for the purpose of manufacturing and selling plastic additives.
Established in June 1989: (Contact) : 〒964-0981 : 4-286 Hiraishi Takada, Nihonmatsu City, Fukushima Prefecture : TEL 0243-23-7715
Acquired capital in NIHON EPOXY RESIN CO., LTD. for the purpose of manufacturing epoxy resin.
Established in August 1990: (Contact) 〒104-0031, 3-12-2 Kyobashi, Chuo-ku, Tokyo, Kyobashi Dai-2 Arakawa Building: TEL 03-6361-1429
Established HAN-NONG ADEKA Co.,Ltd. in Korea (in 1997, the name was changed to DONGBU ADEKA Co.,Ltd.) as an overseas base for manufacturing plastic additives.
Established in April 1993: 〒116-0014, 5-48-5 Higashihiratsuri, Arakawa-ku, Tokyo, Koyo-sha Building: TEL 03-3805-7484
Established AMFINE CHEMICALS CORP. in the US.
Established in March 1994 : 〒684-0046 : 207 Takeuchi Danchi, Saijō City, Tottori Prefecture : TEL 0859-45-4771
Completed Soma Plant (the first period) and started operation.
Took over the operations of epoxy business of ACR CO., LTD.
Established in March 1996: 〒116-0014, 5-48-5 Higashihiratsuri, Arakawa-ku, Tokyo, Koyo-sha Building 2-5F: TEL 03-3805-7451
Established an European office in Germany. (incorporated as an overseas affiliated company in 1999)
Completed the new building of R&D Laboratory. (Ogu District)
Established in January 1999: 〒116-0002, 1-49-1 Arakawa, Arakawa-ku, Tokyo, Arakawa 10 Qin Building 2F: TEL 03-6458-3050
Established ASAHI DENKA KOREA CORP. in South Korea. (now changed company name to ADEKA KOREA CORP.)
Established in April 2000: 〒116-0014, 5-48-5 Higashihiratsuri, Arakawa-ku, Tokyo, Koyo-sha Building 4F: TEL 03-3807-8161
Established in April 2000: 〒101-0048, 2-6 Kanda Jishimachi, Chiyoda-ku, Tokyo, Urban Center Kanda Jishimachi 3F: TEL 03-4455-2398
Acquired YONGO Co.,ltd. from JAPAN TOBACCO INC. and reorganized it as a subsidiary.
Established in August 2001
Established KUKDO CHEMICAL (KUNSHAN) CO., LTD. in China jointly with a Korean company KUKDO CHEMICAL CO., LTD.
The subsidiary DONGBU ADEKA CORP. changed its trade name to ADEKA FINE CHEMICAL KOREA CORP.
Established CHANG CHIANG CHEMICAL (SHANGHAI) CO., LTD. in China.
Completed the Tainan Plant of ADEKA FINE CHEMICAL TAIWAN CORP.
Completed a plant of ADEKA FOODS (CHANGSHU) CO., LTD., a subsidiary in China for manufacturing and selling foods.
Acquired shares of UEHARA FOODS INDUSTRY CO., LTD., a food manufacture and distributor, and reorganized it as a subsidiary.
Established Asahi Fine Foods Co., Ltd. for the production of mayonnaise and dressings (2006: renamed ADEKA Fine Foods Co., Ltd.).
Established ASAHI DENKA Europe GmbH in Germany (2006: renamed ADEKA Europe GmbH).
Established ADEKA Logistics Co., Ltd. (2006: renamed ADEKA Logistics Co., Ltd.).
Established Asahi Food Sales Co., Ltd. for the sale of food processing oils, confectionery, baking, and other food ingredients (2006: renamed ADEKA Food Sales Co., Ltd.).
Established Asahi Electric (Shanghai) Co., Ltd. in China (2006: renamed ADEKA (Shanghai) Trading Co., Ltd.).
Established Asahi Fine Chemical (Shanghai) Co., Ltd. in China (2006: renamed ADEKA Fine Chemical (Shanghai) Co., Ltd.).
Established ASAHI DENKA (ASIA) PTE. LTD. in Singapore (2006: renamed ADEKA (ASIA) PTE. LTD.).
Established ASAHI DENKA USA, INC. in the United States (changed name to ADEKA USA CORP. in 2006)
Established 阿洒旭食品（常熟）有限公司 in China (changed name to 艾迪科食品（常熟）有限公司 in 2006)
The trade name was changed to ADEKA CHEMICAL SUPPLY CORP. in 2006.
The trade name was changed to ADEKA LIFE-CREATE CORP. in 2006.
Changed company name from ASAHI DENKA CO., LTD. to ADEKA CORP.. : Moved headquarters to a new buildingin Higashi-ogu, Arakawa-ku, Tokyo from Nihonbashi,Chuo-ku.
ADEKA INDIA PVT. LTD. established in India.
Established in May 2007
ADEKA FINE CHEMICAL KOREA CORP. merged with ADEKA KOREA CORP. under the name of ADEKA KOREA CORP.
ADEKA KOREA CORP. established R&D center in Korea.
ADEKA and Al GHURAIR PETROCHEMICALS LLC established ADEKA Al GHURAIR ADDITIVES LLC, a joint venture company in UAE.
AMFINE CHEMICAL CORP. in the USA established AM STABILIZERS CORP. for the purpose of manufacturing and selling vinyl chloride stabilizer in the USA.
AM STABILIZERS CORP acquired a vinyl chloride stabilizer business (HALSTAB DIVISION) from American company Hammond Group Inc.
Established ADEKA BRASIL LTDA. in Brazil.
Established ADEKA FOODS （ASIA） SDN.BHD. in Malaysia.
Withdrew investment from KASHIMA CHLORINE & ALKALI CO., LTD., KASHIMA PVC MONOMER CO., LTD., and KASHIMA CHEMICAL CO., LTD.
Completed new building of Urawa R&D Laboratory.
Established "Basic Policy against Corruption" and "Social Media Policy" of ADEKA Group.
ADEKA FOODS (ASIA) SDN. BHD. acquired Halal certification from government agency of Malaysia.
ADEKA FOODS (ASIA) SDN. BHD. acquired HACCP certification from Ministry of Health of Malaysia.
The structure of ADEKA (SHANGHAI) CO., LTD. was transformed into an investment corporation and renamed as ADEKA (CHINA) CO., LTD..
Acquired shares of CROWN CO., LTD. and reorganized it as a subsidiary.
Established a representative office in Ho Chi Minh City, Vietnam for the purpose of market surveys for chemical and food products.
Acquired shares of SHOWA KOSAN CO., LTD. and reorganized it as an equity method affiliate.
Formulated "Action Plan to Promote Success of Women in the Workplace."
ADEKA （CHINA） CO., LTD. established ADEKA FINE CHEMICAL (Zhejiang) Co., LTD. in China for the purpose of manufacturing and selling chemical products such as polymer additives.
NIHON NOHYAKU CO., LTD. became a consolidated subsidiary.
Mohammed Al Otaiba Group acquires shares of ADEKA AL GHURAIR ADDITIVES LLC and changes its name to ADEKA AL OTAIBA MIDDLE EAST LLC.
Dissolved the joint venture, KANTO SODIUM SILICATE GLASS CO., LTD.
Acquired shares of Incubation Alliance, Inc.
Made YONGO CO.,LTD. wholly owned subsidiary through simplified share exchange.
Merger conducted with ADEKA FOODS SALES CORPORATION being the surviving company and CROWN CO.,LTD. and YONGO CO.,LTD. being the merged companies
Transfer of ADEKA FINE CHEMICAL (SHANGHAI) CO., LTD.'s shareholding.
Transfer all shares of UEHARA FOOD INDUSTRY CO.,LTD.
ADEKA Co., Ltd. revised its consolidated performance forecast and final dividend forecast for FY 2027 (April 1, 2026 to March 31, 2027), which was announced on August 7, 2026. Revenue increased from 46.2 billion yen to 46.8 billion yen, operating profit from 5.0 billion yen to 5.3 billion yen, ordinary profit from 5.0 billion yen to 5.3 billion yen, and net income from 3.2 billion yen to 3.35 billion yen.
ＡＤＥＫＡは、生田絵梨花さん出演のTVCM「素財姫（ＡＤＥＫＡダンス）篇」を2026年10月25日から11月8日まで関東エリアで放映します。このほか、TVerで10月25日から11月15日まで、JR東日本の「まど上チャンネル」で11月2日から8日まで広告を展開します。
ADEKA, together with nalu Inc., has launched the "Future Forecast B" project in Kamakura City, aiming to promote plastic resource recycling. The project seeks to uncover local residents' challenges and ideas, and work on conceptualizing and demonstrating a resource recycling model that reuses plastic through collection and recycling. Dialogue and demonstration activities have already begun, and future activities will be communicated via a dedicated website and Instagram.
ADEKA, Gunma University, and SoftBank jointly received the Society of Polymer Science, Japan's Technology Award for developing and demonstrating materials for lightweight, safe Li-SPAN rechargeable batteries. The partners will continue working together toward practical implementation.
ADEKA is sponsoring Erika Ikuta's 2026 hall tour, I.K.T, and will give all attendees a clear file made from recycled plastic using an environmentally compatible resin additive. ADEKA has used Ikuta as its image character since 2022 to enhance its corporate image. The company will continue its efforts to become a business that can thrive into the future.
ADEKA has decided to build a manufacturing plant for its Transparex® clarifying agent at its third factory in Jeonju, South Korea. The product improves the transparency of polypropylene and contributes to greater recycling. Launched in 2024, it is part of ADEKA's efforts to reduce environmental impact and promote material recycling.
ADEKA is expanding production facilities for photoacid generators used in EUV lithography, with a new line scheduled to begin operation in September 2028. As the semiconductor market grows, materials must meet demands for miniaturization and environmental performance. ADEKA is strengthening supply capacity and developing PAG monomers to meet demand for advanced lithography.
ADEKA was selected as a constituent of the JPX-Nikkei Index 400 for fiscal 2026, marking its fourth consecutive year since fiscal 2023. The index consists of companies with strong investment appeal. ADEKA aims to continue increasing shareholder and social value.
ADEKA Corporation has become a sponsor of TBS Radio's program 'VIVANT Villain Conference Room,' which will be broadcast from July 26, 2026. The program airs every Sunday night at 11 PM and is also distributed via YouTube and Podcasts.
ADEKA Corporation announced that the payment process for the disposal of treasury stock as restricted stock compensation was completed on July 17, 2026.