As of December 2025 Banca Monte dei Paschi di Siena has a market cap of โน2.547 Trillion. This makes Banca Monte dei Paschi di Siena the world's 817th 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.