| 1991-02 |
February 1991: Established KOA Shoji Co., Ltd. for the purpose of importing and selling generic pharmaceutical raw materials. |
| 1991-02 |
Established KOA Shoji Co., Ltd. for the purpose of importing and selling generic active pharmaceutical ingredients. |
| 1991-02 |
Established Koa Trading Co., Ltd. for the purpose of importing and selling generic pharmaceutical raw materials |
| 2002-07 |
July 2002: Established KOA Shoji Co., Ltd. and Biotech Bay Co., Ltd. (now KOA Biotech Bay Co., Ltd.). |
| 2002-07 |
KOA Shoji established Biotech Bay Co., Ltd. |
| 2002-07 |
Established Koa Trading Co., Ltd., Biotech Bay Co., Ltd. (now Koa Biotech Bay Co., Ltd.) |
| 2011-06 |
June 2011: KOA Shoji Co., Ltd. acquired a majority stake in Isei Co., Ltd. (now KOA Isei Co., Ltd.). |
| 2011-06 |
ISEI Co., Ltd. became affiliated with KOA Shoji Co., Ltd. |
| 2011-06 |
Acquired a majority stake in Koa Trading Co., Ltd. and Issei Co., Ltd. (now Koa Aisei Co., Ltd.) |
| 2012-07 |
July 2012: KOA Shoji Co., Ltd. acquired a majority stake in Koga Pharmaceutical Co., Ltd. (later renamed KOA Pharmaceutical Co., Ltd. and merged with KOA Biotech Bay Co., Ltd.). |
| 2012-07 |
KOA Pharmaceutical Co., Ltd. (absorbed and merged with KOA Biotech Bay) became affiliated with KOA Shoji Co., Ltd. |
| 2012-07 |
Acquired a majority stake in Koa Trading Co., Ltd. and Koa Pharmaceutical Co., Ltd. (later renamed Koa Pharmaceutical Co., Ltd. and merged with Koa Biotech Bay Co., Ltd.) |
| 2012-07 |
KOA PHARMACEUTICAL CO., LTD. (absorbed and merged with KOA BIOTECH BAY) was affiliated with KOA SHOJI CO., LTD. |
| 2015-01 |
January 2015: Established KOA Shoji Holdings Co., Ltd. as a holding company of KOA Shoji Co., Ltd., Isei Co., Ltd., Biotech Bay Co., Ltd., and Koga Pharmaceutical Co., Ltd. through share transfer. |
| 2015-01 |
KOA Shoji Holdings Co., Ltd. was incorporated as a result of the share transfer. |
| 2015-01 |
Established Koa Trading Holdings Co., Ltd. as a holding company of Koa Trading Co., Ltd., Issei Co., Ltd., Biotech Bay Co., Ltd., and Koa Pharmaceutical Co., Ltd. through share transfer |
| 2018-06 |
June 2018: KOA Shoji Holdings Co., Ltd. listed on the Second Section of the Tokyo Stock Exchange. |
| 2018-06 |
KOA Shoji Holdings Co., Ltd. was listed on the Second Section of the Tokyo Stock Exchange. |
| 2018-06 |
Koa Trading Holdings Co., Ltd. listed on the Second Section of the Tokyo Stock Exchange |
| 2020-06 |
June 2020: KOA Shoji Holdings Co., Ltd. designated for the First Section of the Tokyo Stock Exchange. |
| 2020-06 |
KOA Shoji Holdings Co., Ltd. was listed on the First Section of the Tokyo Stock Exchange. |
| 2020-06 |
Koa Trading Holdings Co., Ltd. designated for the First Section of the Tokyo Stock Exchange |
| 2022-04 |
April 2022: KOA Shoji Holdings Co., Ltd. transferred to the Prime Market of the Tokyo Stock Exchange. |
| 2022-04 |
KOA Shoji Holdings Co., Ltd. was listed on the Prime Market of the Tokyo Stock Exchange. |
| 2022-04 |
Koa Trading Holdings Co., Ltd. transitioned to the Prime Market of the Tokyo Stock Exchange |
