As of September 2026 Banca Monte dei Paschi di Siena has a market cap of ยฃ31.22 Billion. This makes Banca Monte dei Paschi di Siena the world's 612th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.