| Year | Detail |
| 1930 |
Naoji Iwatani established Iwatani Naoji Shoten in Minato-ku, Osaka, Japan, and sold oxygen, welding rods, and carbide. |
| 1989 |
Iwatani joint-ventured with the City of Dalian, China, and established Dalian Iwatani Gas Machinery Co., Ltd, to expand its presence in China's industrial gas market. |
| 2004 |
Iwatani entered the water delivery business, offering Natural Mineral Water from Mt. Fuji as part of its diverse product offerings. |
| 2019 |
Iwatani Corp of America, a wholly owned subsidiary of Iwatani Corp, acquired four hydrogen refueling stations in California from Messer (formerly Linde, LLC) to support the growing demand for zero-emission fuel cell electric vehicles (FCEVs). |
| 2021 |
Iwatani opened an office of Iwatani Australia Pty. Ltd. in Brisbane, Queensland, Australia, to conduct local market and infrastructure research and strengthen the relationships with affiliated companies and the state government. |
| 2023 |
Cosmo Engineering and Iwatani established a joint venture, Cosmo Iwatani Hydrogen Engineering LLC, to collaborate in the hydrogen-related project engineering business. |