As of September 2026 Old Second Bancorp has a market cap of โน121.87 Billion. This makes Old Second Bancorp the world's 5870th 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.
On Sep 19th, 2026 the market cap of Old Second Bancorp was reported to be: