| Year | Detail |
| 1919 |
Sumitomo Corp. is founded as The Osaka North Harbour Co. Ltd. |
| 1944 |
It merges with The Sumitomo Building Co., Ltd. |
| 1950 |
Sumitomo Corp. establishes a U.S. subsidiary in New York. |
| 1962 |
The company consolidates all businesses and adopts a product division structure, establishing nine product divisions. |
| 1970 |
Sumitomo Corp. merges with Sogo Boeki Co. Ltd. |
| 1994 |
Sumitomo Corp. promotes globalization efforts. |
| 1998 |
The Corporate Mission Statement is established. |
| 2001 |
The Head Office is relocated to Chuo-ku, Tokyo. |
| 2013 |
The company introduces the Broad Regional Management System. |
| 2021 |
Sumitomo Corp. forms the Energy Innovation Initiatives. |