As of February 2026 Arthur J. Gallagher & Co. has a market cap of A$77.83 Billion. This makes Arthur J. Gallagher & Co. the world's 444th 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 23rd, 2026 the market cap of Arthur J. Gallagher & Co. was reported to be: