As of May 2026 Arthur J. Gallagher & Co. has a market cap of โฌ45.07 Billion. This makes Arthur J. Gallagher & Co. the world's 461th 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 May 19th, 2026 the market cap of Arthur J. Gallagher & Co. was reported to be: