As of February 2026 White Mountains Insurance Group has a market cap of โน478.62 Billion. This makes White Mountains Insurance Group the world's 3039th 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 Feb 4th, 2026 the market cap of White Mountains Insurance Group was reported to be: