Up until 1934 this trademark identified the Società Generale di Elettricità Sistema Edison and later Società Generale Edison di Elettricità.

This logo was created to represent the newly formed company Montecatini Edison Spa, established in 1966 from the merger of Montecatini and Edison.

This logo was introduced in 1934. In that year the company became Società Edison and went on to use this logo until 1966.

This logo was introduced in 2003 and was used until 2016.

This famous logo was created by the American company Landor to identify Montedison and the whole group. Introduced in 1972, it was used by Edison until 2003.