EX-21.1 9 fibk-20181231xex211.htm SUBSIDIARIES
Exhibit 21.1
Subsidiaries of First Interstate BancSystem, Inc.

| Subsidiary | State of Incorporation or Jurisdiction of Organization |  | Business Name
| First Interstate Bank | Montana |  | First Interstate Bank
| FI Statutory Trust I | Connecticut |  | FI Statutory Trust I
| FI Capital Trust II | Delaware |  | FI Capital Trust II
| FI Statutory Trust III | Delaware |  | FI Statutory Trust III
| FI Capital Trust IV | Delaware |  | FI Capital Trust IV
| FI Statutory Trust V | Delaware |  | FI Statutory Trust V
| FI Statutory Trust VI | Delaware |  | FI Statutory Trust VI
| Mountain South, LLC | Montana |  | Mountain South, LLC
| Northwest Bancorporation Capital Trust I | Washington |  | Northwest Bancorporation Capital Trust I