| Year | Detail |
| 1893 |
Compagnie Francaise Thomson-Houston (CFTH) was formed. |
| 1968 |
The professional electronics businesses of Thomson-Brandt (previously CFTH) merge with Compagnie Generale de Telegraphie Sans Fil (CSF) to form Thomson-CSF. |
| 1982 |
The parent company, Thomson SA, is nationalized. |
| 1983 |
Entered an agreement with CGE. |
| 1987 |
The semiconductor businesses are merged with those of the Italian group IRIFinmeccanica. |
| 1996 |
Holdings in Credit Lyonnais and SGSThomson (now ST Microelectronics) are divested. |
| 1999 |
Extended to South Africa, Australia, South Korea and Singapore. |
| 2000 |
Thomson-CSF renamed Thales. |
| 2007 |
Thales signed an agreement with French naval player DCNS. |
| 2019 |
Acquired Gemalto. |