The current institutional shareholding score of First Interstate Bancsystem Inc is 10.00, ranking 1 out of 399 in the Banking Services industry. The latest institutional shareholding proportion is 106.50%, representing a quarter-over-quarter increase of 24.08%. The largest institutional shareholder is ETHSX, holding a total of 1.02M shares, representing 1.13% of shares outstanding, with 1.00% increase in holdings.