[2][3] Banca Popolare di Sondrio was an urban cooperative bank found in 1871.

The bank also owned equity interests in several companies that provide services to the bank, such as Banca Italease (4.252% on 30 June 2009), Arca Vita and Istituto Centrale delle Banche Popolari Italiane (2%).

In September 2017 the bank announced that, they acquired Banca della Nuova Terra.

[4] In September 2023, Unipol acquired 10.2% of Banca Popolare di Sondrio's shares, thus lifting its stake at 19.7 % of the capital of the bank.

[5] In March 2024, the company launched a €200 million subordinated bond repurchase programme maturing on 30 July 2029.