Aon is a British company based in London that is active in the insurance and risk management industries.
As of February 2026 Aon has a market cap of โน6.744 Trillion. This makes Aon the world's 318th 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 3rd, 2026 the market cap of Aon was reported to be: