| September 1961 |
Sigma Research Center was established in Setagaya-ku. |
| November 1965 |
A new office building was completed at the existing building site in Komae-shi. |
| March 1968 |
Corporate organization was officially changed into a stock company. |
| November 1970 |
Trade name was officially changed to Sigma Corporation. |
| November 1973 |
The primary construction of Aizu Integrated Factory was completed. |
| November 1979
| Sigma Germany was established |
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February 1983
| The secondary construction of Aizu Integrated Factory was completed. |
| March 1983
| New head office building was completed |
| May 1983
| Sigma Hong Kong was established |
| May 1986
| Sigma America was established |
| May 1991
| Sigma Benelux was established |
| April 1992
| Sigma Singapore was established. |
| February 1993
| New factory was completed |
| September 1993
| Sigma France was established. |
| November 2000
| Sigma U.K. was established. |