Effective February 1, 2022, Great Western Bancorp, Inc. was merged with and into First Interstate BancSystem, Inc, with First Interstate continuing as the surviving corporation (the “Merger”) and (ii) immediately following the Merger, Great Western Bank, Great Western's wholly owned banking subsidiary, was merged with and into First Interstate's wholly owned banking subsidiary, First Interstate Bank (the “Bank Merger”), with First Interstate Bank continuing as the surviving bank in the Bank Merger. As of the Effective Time, and pursuant to the terms of the Merger Agreement, Great Western's directors and executive officers ceased serving as directors and executive officers of Great Western. In addition, as of the Effective Time and in accordance with the Merger Agreement, the following individuals, each of whom was a member of the board of directors of Great Western immediately prior to consummation of the Merger, were appointed to the board of directors of First Interstate: James Brannen, Frances Grieb, Thomas Henning, Stephen Lacy and Daniel Rykhus.