| Year | Detail |
| 1910 |
Taiyo Nippon Sanso Corp. was established in 1910 as Nippon Sanaso Corp., marking the beginning of its journey in the industrial sector. |
| 2004 |
Nippon Sanso Co., Ltd. merged with Taiyo Toyo Sanso Co., Ltd. to create Taiyo Nippon Sanso Corp., and a separate company from the domestic gas business was established. |
| 2006 |
Taiyo Nippon acquired all the shares of Hitachi Sanso K.K. to make it a wholly owned subsidiary named Taiyo Nippon Sanso Higashikanto Corp. |
| 2008 |
Taiyo Nippon established Taiyo Nippon Sanso (China) Investment Co., Ltd., an investment company, and Dalian Changxing Island Taiyo Nippon Sanso Gas Co., Ltd., an industrial gas manufacturer, in Dalian’s Changxing Island Seaport Industrial Area in China. |
| 2013 |
Taiyo Nippon acquired Pacific Medico Co., Ltd., a manufacturer and distributor of medical equipment. |
| 2014 |
Taiyo Nippon became a consolidated subsidiary of Mitsubishi Chemical Group Corporation after the completion of the tender offer for the company's shares. |
| 2015 |
Taiyo Nippon acquired Air Products Industry Co., Ltd., a company accounted for using the equity method in Thailand, and made it a consolidated subsidiary. |
| 2022 |
Toho Nippon Sanso Gas Center Co., a filling station jointly owned by Taiyo Nippon Sanso Corporation and Toho Acetylene Co., Ltd., started operation. |
| 2024 |
Taiyo Nippon developed a high-precision cryogenic blast machine SOFTBLASTA SCS-CB-BS20 that exploits the low-temperature brittleness of rubber or resin, a molding material, and that removes burrs formed during molding by rapidly cooling burrs with coldness. |