| 1968 |
Foundation of Ogaki Seiko Co., Ltd. |
| 1978 |
Completion of new head office |
| 1984 |
Foundation of Seiko High Tech |
| 2006 |
Completion of annealing plant |
| 2008 |
Completion of Wanouchi plant |
| 1984-2008 |
Foundation of joint venture companies (two in Korea and one in China) |
| 2010 |
Completion of Nagasaki plant |
| 2011 |
Actual work of Okinawa plan
Foundation of Development Center for Die and Mold Advanced Technology |