In the mid-1950s, Mediobanca entered into agreements with important foreign partners (Lazard Group, Berliner Händel-Gesellschaft, Lehman Brothers, Sofina) that enabled the bank to play a role on the international market and obtained a Stock Exchange listing in 1956.
In 1975 he was appointed Cavaliere del Lavoro, and in later years he entered the Board of Directors of the Banca Commerciale Italiana (of which he became chairman), Montedison (chairman), Compart (chairman), Assicurazioni Generali (of which he became a member of the Executive Committee), Olivetti, Mediobanca and Gemina.