FIRST INTERSTATE BANCSYSTEM INC: 10% Owner Sells 10,000 Shares at $32.75/Share

First Interstate Bancsystem Inc. [FIBK] reports that the Susan Scott Heyneman Trust, with Susan Heyneman and First Interstate Wealth Management as Co-Trustees, has sold 10,000 shares at a price of $32.75 per share on December 1, 2025.