FIRST INTERSTATE BANCSYSTEM INC — Form 8-K

First Interstate BancSystem, Inc. entered into an employment agreement with Jeffery Lee effective September 14, 2026, appointing him as Executive Vice President and Chief Operations Officer of both the parent company and First Interstate Bank. Lee will receive an annual base salary of $480,000, eligible for bonuses and incentive compensation, with severance protections including 1x base salary plus average prior 3-year bonus (or 2x if termination follows acquisition), 12-month health benefits continuation, and extended protections (2x salary, 2x target bonus, 24-month health benefits) if termination occurs within 6 months before or 18 months after a Change in Control. The agreement includes standard non-compete, non-solicitation, and confidentiality covenants.