BILLINGS, Mont.–(BUSINESS WIRE)–First Interstate BancSystem, Inc. (NASDAQ: FIBK), parent company of First Interstate Bank, will report third quarter results after the market closes on Thursday, October 22, 2026. A conference call for investors is scheduled for Friday, October 23, 2026, at 9:30 a.m. Eastern (7:30 a.m. Mountain), during which the Company will discuss quarterly results. There will be a question-and-answer session following the presentation. The conference call will be accessible