As of December 2025 White Mountains Insurance Group has a market cap of โน466.70 Billion. This makes White Mountains Insurance Group the world's 3001th 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 Dec 6th, 2025 the market cap of White Mountains Insurance Group was reported to be: