On January 19, 2022, James R. Scott, Jr., a member of the Board of Directors of First Interstate BancSystem, Inc. informed FIBK of his resignation from the Board, effective upon the closing of the previously announced business combination transaction between FIBK and Great Western Bancorp, Inc. pursuant to the Agreement and Plan of Merger (the merger agreement"), dated as of September 15, 2021, by and between FIBK and GWB. Mr. Scott's resignation is not due to any disagreement with FIBK on any matter relating to FIBK's operations, policies or practices.