| 1937 | Established Kyowa Research Laboratories. |
|---|---|
| 1942 | Kyowa Kagaku Kogyo Co., Ltd., the forerunner of Kyowa Sangyo Co., Ltd. and which oversees Kyowa Research Laboratories, began research into industrialization of Butyl alcohol. |
| 1948 | Kyowa Sangyo Co., Ltd., the forerunner of Kyowa Hakko Kogyo Co., Ltd., began Japan’s first mass production of Acetone and Butyl alcohol from syrup using fermentation. |
| 1949 |
Established Kyowa Hakko Kogyo Co., Ltd.
|
| 1961 | Established Daikyowa Sekiyu Kagaku Co., Ltd. as a joint venture with Daikyo Sekiyu. Kyowa Hakko Kogyo Co., Ltd. converts to petrochemical manufacturing methods. |
| 1963 |
Completion of the Yokkaichi Plant Umaokoshi Plant for Daikyowa Sekiyu Kagaku Co., Ltd.
|
| 1966 | Established Kyowa Yuka Co., Ltd. (A subsidiary chemical manufacturer of Kyowa Hakko Kogyo Co., Ltd. Separated the Derivative Department of Daikyowa Sekiyu Kagaku Co., Ltd.) |
| 1970 |
Completion of the Yokkaichi Plant Kasumigaura Plant.
|
| 1988 | Established Japan Oxocol Co., Ltd. as a subsidiary chemical manufacturer of Kyowa Hakko Kogyo Co., Ltd. Switched to a two plant system, consisting of the Chiba and Yokkaichi Plants. |
| 1989 | The Yokkaichi Plant receives the MITI* Minister's Award for Excellent Energy Conservation Plant and Building. *MITI=Ministry of International Trade and Industry (currently the Ministry of Economy, Trade and Industry) |
| 1991 | Merged Kyowa Yuka Co., Ltd. and Japan Oxocol Co., Ltd. |
| 1998 |
The Chiba Plant receives ISO 9002 certification.
The Umaokoshi Plant receives commendation from MITI for high-pressure gas safety. 
|
| 1999 |
The Yokkaichi Plant receives ISO 9002 certification.
The Yokkaichi Plant achieves the highest level Type Five Record for accident-free hours worked. 
|
| 2000 | Established J-Plus Co., Ltd., as a joint venture with Mitsubishi Chemical Corporation. The Yokkaichi Plant and Chiba Plant both receive ISO 14001 certification. The Yokkaichi Plant receives a commendation (Award of Excellence) from the Minister of Health, Labor and Welfare. |
| 2002 |
The Yokkaichi Plant receives certification for longest accident-free period in the organic chemical industry.
|
| 2003 | Established Japan Ethyl Acetate Co., Ltd., as a joint venture with Showa Denko K.K. The Yokkaichi Plant and Chiba Plant switch certification from ISO 9002 to ISO 9001:2000. |
| 2004 | Name changed to Kyowa Hakko Chemical Co., Ltd. through joint investment of the Chemical Department of Kyowa Hakko Co., Ltd. and Kyowa Yuka Co., Ltd. |
| 2007 | The Chiba Plant received a commendation from the Minister of Land, Infrastructure, Transport and Tourism for its distinguished maritime-related service on Marine Day. |
| 2008 | The Yokkaichi Plant extended its accident-free record (23.95 million hours as of October, 2008) to remain as leaders in the organic chemical industry. |
| 2010 | Established KJ Holdings Co., Ltd |
| 2011 | Spun off from Kyowa Hakko Kirin Group as an independent entity under Japan Industrial Partners, Inc. Merged Kyowa Hakko Chemical Co., Ltd. and KJ Holdings Co., Ltd. |
| 2012 | Name changed to KH Neochem Co., Ltd. |
| 2016 |
Listed on the First Section of the Tokyo Stock Exchange
|
| 2018 | Formulation of VISION 2030 |
| 2019 | Headquarters moved to the current location KH i-Lab (KH Neochem innovation laboratory) opened as a new R&D Structure base |
| 2022 | Shifted to the prime market in April due to the revision of the market classification of the Tokyo Stock Exchange. |
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