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 ยฃ50.77 Billion. This makes Aon the world's 345th 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 24th, 2026 the market cap of Aon was reported to be: