The current institutional shareholding score of Arthur J. Gallagher & Co. is 10.00, ranking 1 out of 117 in the Insurance industry. The latest institutional shareholding proportion is 92.72%, representing a quarter-over-quarter decrease of 1.67%. The largest institutional shareholder is ETHSX, holding a total of 2.07M shares, representing 0.76% of shares outstanding, with 607.64% increase in holdings.