Here are the S-3 shelf registrations from First Interstate BancSystem, Inc. (FIBK) in our archive over the last 12 months, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
An S-3 covers the shelf registration that lets an established company sell over time, so if you follow FIBK and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full FIBK filings page.
First Interstate BancSystem, Inc. filed a shelf registration statement to offer common stock, preferred stock, depositary shares, debt securities, warrants, purchase contracts and units from time to time after this registration statement becomes effective. The prospectus is dated May 26, 2026 and describes general terms; specific offering terms will be provided in prospectus supplements.
The company states it is authorized to issue up to 150,000,000 shares of Common Stock and up to 100,000 shares of preferred stock. The registrant operates 273 banking offices across ten states as of May 26, 2026. The prospectus incorporates by reference recent filings including the Annual Report on Form 10-K for the year ended December 31, 2025 filed February 26, 2026, and a Form 10-Q for the quarter ended March 31, 2026.