As of January 2026 Marsh & McLennan Companies has a market cap of โน8.245 Trillion. This makes Marsh & McLennan Companies the world's 233th 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 Jan 10th, 2026 the market cap of Marsh & McLennan Companies was reported to be: