| 1978 |
Zen Chemicals Co., Ltd. (Headquarters) founded in Kanda, Chiyoda-ku, Tokyo |
| 1979 |
Zen Chemicals Co., Ltd. Osaka office founded |
| 1984 |
Nanwa Kako Co., Ltd. (Factory) founded in Osaka |
| 1994 |
Trading with Chinese companies commenced |
| 1995 |
Zen Chemicals Co., Ltd. Tokyo headquarters acquired and relocated to a company building in Taito, Taito-ku, Japan |
| 2008 |
Trading with Indian companies commenced |
| 2012 |
Shanzheng Technology Co., Ltd. founded in Taiwan |
| 2018 |
Shanzheng Technology Co., Ltd. India office founded |
| 2019 |
Shanzheng Technology Co., Ltd. Food Additives Development Center founded in Taiwan |
| 2021 |
IFC division launched |
| 2023 |
Osaka office relocated |
