|1926||Founded by late Jiro Kusumoto|
|1948||Incorporated and named Kusumoto & Co. as a distributor of chemical products|
|1956||Started manufacturing paint additives (DISPARLON)|
|1962||Reorganized as Kusumoto Inc.
Constructed Koshigaya Plant and started its operation
|1972||Established Kusumoto Chemicals, Ltd. with an investment stake of 100% from Kusumoto & Co., Ltd.
Separated and took over sales and Manufacturing section of Kusumoto Chemicals, Ltd.
Constructed Soka laboratory and started its operation
|1973||Entered the environmental testing business and established ETAC brand started
manufacture and sale of environmental test chambers (ETAC)
|1979||Constructed Soka plant and started its operation|
|1983||Constructed new Laboratory at Soka-city|
|1996||Constructed Kashima plant and started its operation|
|2000||Additive division acquired ISO9001 certification
ETAC division acquired IECQ certification
|2001||ETAC division acquired ISO9001 certification|
|2003||Constructed Kusumoto Chemicals (Kunshan) Co., Ltd. and started its operation|
|2006||Opened Mizunami Laboratory
Established Kusumoto Chemicals (Shanghai) Co., Ltd.
|2007||Established Kusumoto Chemicals（India) Pvt. Ltd.|
|2014||Completed New Kusumoto Bldg.|
|2016||Established Kusumoto Chemicals (Thailand) Co., Ltd.
Constructed new Koshigaya Plant Office
|2017||Constructed Saitama warehouse and started its operation|
|2019||Soka Second plant started operation|