EX-21.1 3 fibk-20221231xex211_subsid.htm EX-21.1
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
| Northwest Bancorporation Capital Trust I | Washington |  | Northwest Bancorporation Capital Trust I
| Great Western Statutory Trust IV | Connecticut |  | Great Western Statutory Trust IV
| GWB Capital Trust VI | Nebraska |  | GWB Capital Trust VI
| HF Financial Capital Trust III | South Dakota |  | HF Financial Capital Trust III
| HF Financial Capital Trust IV | South Dakota |  | HF Financial Capital Trust IV
| HF Financial Capital Trust V | South Dakota |  | HF Financial Capital Trust V
| HF Financial Capital Trust VI | South Dakota |  | HF Financial Capital Trust VI
| Sunstate Bancshares Trust II | Arizona |  | Sunstate Bancshares Trust II