| Year | Detail |
| 1888 |
Sumitomo Heavy Industries Ltd. is launched as a machinery production and repair shop for the Besshi Copper Mine |
| 1897 |
Incorporated Uraga Dock Co. Ltd. |
| 1902 |
Acquires Tokyo Ishikawajima Shipyards Co. Ltd.'s Uraga Works. |
| 1928 |
Name changed to Sumitomo Besshi Copper Mine Ltd. |
| 1934 |
Incorporated as Sumitomo Machinery Co. Ltd. |
| 1957 |
U.S. office is established. |
| 1964 |
London office is established. |
| 1969 |
Sumitomo Machinery Industries Co. Ltd. and Uraga Heavy Industries Co. Ltd. merge to form Sumitomo Heavy Industries Ltd. |
| 1972 |
Establishment of Oppama Shipyard. |
| 1975 |
Systems Research Center is established in Tanashi. |
| 1976 |
Malaysia Shipyard & Engineering is established. |
| 1985 |
Establishment of Hong Kong office. |
| 1986 |
Sumitomo (SHI) Construction Machinery Co. Ltd. is established. |
| 1989 |
Acquires Lumonix, a Canadian manufacturer of laser devices. |
| 1995 |
The company and IHI jointly form the naval venture Marine United. |
| 2000 |
Sumitomo Heavy Industries Finetech Ltd. is established. |
| 2002 |
Acquires U.S.-based APD Cryogenics Inc. |
| 2006 |
Absorbs the operations of Synex Co. Ltd. into the company. |
| 2008 |
Acquired Demag Plastics Group. |
| 2011 |
Acquired Hansen Industrial Transmissions NV. |
| 2015 |
Establishes the new technology research center building at the Ehime Works. |
| 2017 |
Acquires Persimmon Technologies. |
| 2018 |
Merged Sumiju Tomida Machinery Co. Ltd. and Sumijyu Technos Ltd. |
| 2022 |
Merged Sumiju Business Ltd. |