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First Interstate BancSystem, Inc. (FIBK)

Nasdaq: FIBK · State Commercial Banks · Billings, MT · filing with the SEC since 1996
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Grade4.8
◀ Past 5.0● Present 4.7▶ Future 4.3
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Filings

403 filings since 2017 beside 852 insider forms · Large accelerated filer · read from EDGAR on Nov 13, 2026
Due nextLarge accelerated filer
10-K Annual report for the fiscal year ending Dec 31, 2026Large accelerated filers have 60 days after the fiscal year ends. by Mar 1, 2027
10-Q Quarterly report for the quarter ending Mar 31, 2027Large accelerated filers have 40 days after the quarter ends; quarter ends are taken to the month end. by May 10, 2027

A deadline is the latest date the SEC's rules allow for its filer category. It is not a forecast of the day the company files. Last time, the results release (8-K item 2.02) came 22 days after the quarter ended. The proxy statement was last filed Apr 16, 2026.

Filings a yearinsider forms included
1291341361381109710898
20192020202120222023202420252026

2026 counts to Nov 13, 2026.

Officer or director change (8-K item 5.02): 22 times in the last 36 months, the newest Sep 16, 2026.Auditor change (8-K item 4.01): 1 time in the last 36 months, the newest Nov 30, 2023.
Insider forms 852

Insider forms (3, 4, 5 and 144) are counted each year but not listed here; the people and their trades are on the Ownership tab.

FiledFormWhat it is, in plain wordsPeriodAsk
Nov 2, 2026 10-Q Quarterly report Sep 30, 2026
Oct 22, 2026 8-K items 2.02, 7.01, 8.01, 9.01 Results released; Investor disclosure (Regulation FD); Other event · Current report
Sep 16, 2026 8-K items 5.02, 9.01 Officer or director change · Current report Sep 14, 2026
Aug 21, 2026 8-K items 5.02, 9.01 Officer or director change · Current report
Aug 7, 2026 SCHEDULE 13G Large holder notice
Aug 3, 2026 10-Q Quarterly report Jun 30, 2026
Jul 23, 2026 8-K items 2.02, 7.01, 8.01, 9.01 Results released; Investor disclosure (Regulation FD); Other event · Current report
Jul 16, 2026 8-K items 5.02, 9.01 Officer or director change · Current report Jul 13, 2026
Jul 9, 2026 8-K items 5.02, 9.01 Officer or director change · Current report
May 29, 2026 8-K items 5.02, 5.03, 5.07, 9.01 Officer or director change; Charter, bylaw or fiscal-year change; Shareholder vote · Current report May 27, 2026
May 26, 2026 S-3ASR Shelf registration
May 15, 2026 SCHEDULE 13G/A Large holder update, amended
May 13, 2026 8-K items 5.02, 9.01 Officer or director change · Current report May 11, 2026
May 7, 2026 10-Q Quarterly report Mar 31, 2026
Apr 29, 2026 SCHEDULE 13G Large holder notice
Apr 29, 2026 8-K items 2.02, 7.01, 8.01, 9.01 Results released; Investor disclosure (Regulation FD); Other event · Current report
Apr 16, 2026 DEFA14A Extra proxy material
Apr 16, 2026 DEF 14A Proxy statement Dec 31, 2025
Apr 16, 2026 ARS Annual report to shareholders Dec 31, 2025
Mar 31, 2026 PRE 14A Preliminary proxy statement Mar 30, 2026
Mar 26, 2026 SCHEDULE 13G/A Large holder update, amended
Mar 5, 2026 SCHEDULE 13G/A Large holder update, amended
Feb 26, 2026 10-K Annual report Dec 31, 2025
Feb 9, 2026 SCHEDULE 13G Large holder notice
Jan 30, 2026 SCHEDULE 13G/A Large holder update, amended
Jan 28, 2026 8-K items 2.02, 7.01, 8.01, 9.01 Results released; Investor disclosure (Regulation FD); Other event · Current report
Jan 8, 2026 SCHEDULE 13G/A Large holder update, amended
Nov 18, 2025 8-K items 5.02, 9.01 Officer or director change · Current report Nov 14, 2025
Nov 12, 2025 SCHEDULE 13G Large holder notice
Nov 6, 2025 10-Q Quarterly report Sep 30, 2025
Nov 4, 2025 SCHEDULE 13G/A Large holder update, amended
Oct 29, 2025 8-K items 2.02, 7.01, 8.01 Results released; Investor disclosure (Regulation FD); Other event · Current report
Oct 16, 2025 8-K items 7.01, 9.01 Investor disclosure (Regulation FD) · Current report
Oct 14, 2025 8-K items 7.01, 9.01 Investor disclosure (Regulation FD) · Current report Oct 10, 2025
Sep 9, 2025 8-K items 5.02, 7.01, 9.01 Officer or director change; Investor disclosure (Regulation FD) · Current report Sep 3, 2025
Sep 2, 2025 8-K items 5.02, 9.01 Officer or director change · Current report Aug 29, 2025
Aug 29, 2025 8-K/A item 5.02 Officer or director change · Current report, amended Aug 13, 2025
Aug 28, 2025 8-K items 8.01, 9.01 Other event · Current report
Aug 18, 2025 8-K items 1.02, 8.01, 9.01 Major agreement ended; Other event · Current report Aug 15, 2025
Aug 15, 2025 8-K items 5.02, 9.01 Officer or director change · Current report Aug 13, 2025
40 of 403 shown

Every row opens the filing on EDGAR. The plain words are the site's own for each form and each 8-K item; the complete history, insider forms included, is on EDGAR.

SI Assistanton FIBK · research, not advice