First Interstate Bancsystem Inc SEC filings FIBK
First Interstate Bancsystem Inc has 1,001 filings in SEC EDGAR's recent list, going back to Jul 2, 2018. Its latest annual report, Form ARS, was filed on Apr 16, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 2, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 22, 2026 (results of operations, regulation fd disclosure, other events). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 2, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Oct 22, 2026 | Oct 22, 2026 |
| 8-K |
Current report
Officer or director change
|
Sep 16, 2026 | Sep 14, 2026 |
| 8-K |
Current report
Officer or director change
|
Aug 21, 2026 | Aug 21, 2026 |
| 10-Q | Quarterly report | Aug 3, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jul 23, 2026 | Jul 23, 2026 |
| 8-K |
Current report
Officer or director change
|
Jul 16, 2026 | Jul 13, 2026 |
| 8-K |
Current report
Officer or director change
|
Jul 9, 2026 | Jul 9, 2026 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change, Shareholder vote results
|
May 29, 2026 | May 27, 2026 |
| S-3ASR | Automatic shelf registration | May 26, 2026 | — |
| 8-K |
Current report
Officer or director change
|
May 13, 2026 | May 11, 2026 |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Apr 29, 2026 | Apr 29, 2026 |
| DEFA14A | Additional proxy material | Apr 16, 2026 | — |
| DEF 14A | Proxy statement | Apr 16, 2026 | Dec 31, 2025 |
| ARS | Annual report to shareholders | Apr 16, 2026 | Dec 31, 2025 |
| PRE 14A | Preliminary proxy statement | Mar 31, 2026 | Mar 30, 2026 |
| 10-K | Annual report | Feb 26, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 28, 2026 | Jan 28, 2026 |
| 8-K |
Current report
Officer or director change
|
Nov 18, 2025 | Nov 14, 2025 |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Oct 29, 2025 | Oct 29, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 16, 2025 | Oct 16, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 14, 2025 | Oct 10, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Sep 9, 2025 | Sep 3, 2025 |
| 8-K |
Current report
Officer or director change
|
Sep 2, 2025 | Aug 29, 2025 |
| 8-K/A |
Amended current report
Officer or director change
|
Aug 29, 2025 | Aug 13, 2025 |
| 8-K |
Current report
Other events
|
Aug 28, 2025 | Aug 28, 2025 |
| 8-K |
Current report
Agreement ended, Other events
|
Aug 18, 2025 | Aug 15, 2025 |
| 8-K |
Current report
Officer or director change
|
Aug 15, 2025 | Aug 13, 2025 |
| 10-Q | Quarterly report | Aug 6, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jul 29, 2025 | Jul 29, 2025 |
| 8-K |
Current report
Other events
|
Jul 3, 2025 | Jul 3, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
Jun 10, 2025 | Jun 10, 2025 |
| 424B5 | Prospectus supplement | Jun 6, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 6, 2025 | Jun 5, 2025 |
| FWP | Free writing prospectus | Jun 5, 2025 | — |
| 305B2 | Filing | Jun 5, 2025 | — |
| FWP | Free writing prospectus | Jun 5, 2025 | — |
| 424B5 | Prospectus supplement | Jun 5, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 2, 2025 | Jun 2, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jun 2, 2025 | Jun 1, 2025 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change, Shareholder vote results
|
May 23, 2025 | May 20, 2025 |
| DEFA14A | Additional proxy material | May 16, 2025 | — |
| 10-Q | Quarterly report | May 7, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Apr 29, 2025 | Apr 29, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 28, 2025 | Apr 28, 2025 |
| ARS | Annual report to shareholders | Apr 8, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 8, 2025 | — |
| DEF 14A | Proxy statement | Apr 8, 2025 | Apr 8, 2025 |
| 8-K |
Current report
Officer or director change
|
Mar 19, 2025 | Mar 14, 2025 |
| 10-K | Annual report | Feb 28, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Officer or director change
|
Feb 26, 2025 | Feb 24, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Feb 25, 2025 | Feb 20, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 29, 2025 | Jan 29, 2025 |
| 8-K |
Current report
Results of operations, Impairment
|
Jan 10, 2025 | Jan 3, 2025 |
| 10-Q | Quarterly report | Nov 4, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Oct 24, 2024 | Oct 24, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Oct 9, 2024 | Oct 9, 2024 |
| 10-Q | Quarterly report | Aug 2, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jul 25, 2024 | Jul 25, 2024 |
| 8-K |
Current report
Officer or director change
|
Jul 12, 2024 | Jul 8, 2024 |
| 8-K |
Current report
Officer or director change
|
Jun 14, 2024 | Jun 14, 2024 |
| S-8 | Employee stock plan registration | May 23, 2024 | — |
| 8-K |
Current report
Officer or director change, Shareholder vote results, Regulation FD disclosure
|
May 23, 2024 | May 20, 2024 |
| DEFA14A | Additional proxy material | May 7, 2024 | — |
| 10-Q | Quarterly report | May 3, 2024 | Mar 31, 2024 |
| DEFA14A | Additional proxy material | Apr 30, 2024 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Apr 24, 2024 | Apr 24, 2024 |
| ARS | Annual report to shareholders | Apr 11, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 11, 2024 | — |
| DEF 14A | Proxy statement | Apr 11, 2024 | Apr 11, 2024 |
| 8-K |
Current report
Officer or director change
|
Apr 4, 2024 | Apr 2, 2024 |
| 10-K | Annual report | Feb 29, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 30, 2024 | Jan 30, 2024 |
| 8-K |
Current report
Material agreement
|
Dec 14, 2023 | Dec 14, 2023 |
| 8-K |
Current report
Officer or director change
|
Dec 1, 2023 | Nov 30, 2023 |
| 8-K |
Current report
Auditor change
|
Nov 30, 2023 | Nov 28, 2023 |
| 10-Q | Quarterly report | Nov 3, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Oct 25, 2023 | Oct 25, 2023 |
| 8-K |
Current report
Officer or director change
|
Aug 28, 2023 | Aug 24, 2023 |
| 10-Q | Quarterly report | Aug 4, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jul 26, 2023 | Jul 26, 2023 |
| 8-K |
Current report
Officer or director change
|
Jun 30, 2023 | Jun 28, 2023 |
| S-3ASR | Automatic shelf registration | May 26, 2023 | — |
| 8-K |
Current report
Results of operations
|
May 25, 2023 | May 24, 2023 |
| S-8 | Employee stock plan registration | May 25, 2023 | — |
| 8-A12B/A | Filing | May 25, 2023 | — |
| 8-K |
Current report
Change to shareholder rights, Officer or director change, Bylaw or fiscal year change, Shareholder vote results
|
May 25, 2023 | May 24, 2023 |
| DEFA14A | Additional proxy material | May 12, 2023 | — |
| 10-Q | Quarterly report | May 5, 2023 | Mar 31, 2023 |
| DEFA14A | Additional proxy material | May 5, 2023 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Apr 26, 2023 | Apr 26, 2023 |
| ARS | Annual report to shareholders | Apr 11, 2023 | Dec 31, 2022 |
| DEFA14A | Additional proxy material | Apr 11, 2023 | — |
| DEF 14A | Proxy statement | Apr 11, 2023 | — |
| 8-K |
Current report
Bylaw or fiscal year change
|
Mar 16, 2023 | Mar 10, 2023 |
| PRE 14A | Preliminary proxy statement | Mar 10, 2023 | — |
| 10-K | Annual report | Feb 24, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Officer or director change
|
Feb 10, 2023 | Feb 9, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 26, 2023 | Jan 26, 2023 |
| 8-K |
Current report
Officer or director change
|
Jan 13, 2023 | Jan 11, 2023 |
| S-8 POS | Filing | Jan 9, 2023 | — |
| S-8 POS | Filing | Jan 9, 2023 | — |
| 10-Q | Quarterly report | Nov 7, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Oct 25, 2022 | Oct 24, 2022 |
| 8-K |
Current report
Officer or director change
|
Oct 3, 2022 | Oct 3, 2022 |
| 10-Q | Quarterly report | Aug 5, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jul 26, 2022 | Jul 26, 2022 |
| 15-12G | Deregistration | Jul 11, 2022 | — |
| 8-A12B/A | Filing | Jul 8, 2022 | — |
| 8-K |
Current report
Shareholder vote results
|
May 27, 2022 | May 25, 2022 |
| 8-K |
Current report
Other events
|
May 26, 2022 | May 25, 2022 |
| 10-Q | Quarterly report | May 9, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Apr 28, 2022 | Apr 28, 2022 |
| 8-K/A | Amended current report | Apr 19, 2022 | Feb 1, 2022 |
| DEFA14A | Additional proxy material | Apr 14, 2022 | — |
| DEF 14A | Proxy statement | Apr 14, 2022 | May 25, 2022 |
| 8-K |
Current report
Officer or director change
|
Mar 25, 2022 | Mar 25, 2022 |
| 8-K |
Current report
Change to shareholder rights, Other events
|
Mar 25, 2022 | Mar 25, 2022 |
| 8-K |
Current report
Officer or director change
|
Mar 21, 2022 | Mar 15, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Feb 25, 2022 | Feb 25, 2022 |
| 10-K | Annual report | Feb 25, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Acquisition or sale of assets, New debt, Officer or director change, Bylaw or fiscal year change, Regulation FD disclosure, Other events
|
Feb 1, 2022 | Feb 1, 2022 |
| 8-K |
Current report
Other events
|
Jan 27, 2022 | Jan 27, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 27, 2022 | Jan 27, 2022 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change, Shareholder vote results, Other events
|
Jan 20, 2022 | Jan 19, 2022 |
| 425 | Form 425 | Jan 11, 2022 | — |
| 8-K |
Current report
Other events
|
Jan 10, 2022 | Jan 10, 2022 |
| 425 | Form 425 | Dec 23, 2021 | — |
| 8-K |
Current report
Other events
|
Dec 23, 2021 | Dec 22, 2021 |
| EFFECT | Filing | Dec 16, 2021 | — |
| 424B3 | Prospectus | Dec 16, 2021 | — |
| CORRESP | Letter to the SEC | Dec 14, 2021 | — |
| S-4/A | Filing | Dec 14, 2021 | — |
| UPLOAD | Letter from the SEC | Nov 9, 2021 | — |
| 10-Q | Quarterly report | Nov 4, 2021 | Sep 30, 2021 |
| S-4 | Registration for a merger or exchange | Nov 4, 2021 | — |
| 425 | Filing | Oct 29, 2021 | — |
| 425 | Filing | Oct 29, 2021 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Oct 26, 2021 | Oct 25, 2021 |
| 425 | Form 425 | Sep 21, 2021 | — |
| 425 | Form 425 | Sep 21, 2021 | — |
| 425 | Form 425 | Sep 20, 2021 | — |
| 8-K |
Current report
Material agreement
|
Sep 20, 2021 | Sep 15, 2021 |
| 425 | Form 425 | Sep 20, 2021 | — |
| 425 | Form 425 | Sep 17, 2021 | — |
| 425 | Form 425 | Sep 17, 2021 | — |
| 425 | Form 425 | Sep 17, 2021 | — |
| 425 | Form 425 | Sep 16, 2021 | — |
| 425 | Form 425 | Sep 16, 2021 | — |
| 425 | Form 425 | Sep 16, 2021 | — |
| 425 | Form 425 | Sep 16, 2021 | — |
| 425 | Form 425 | Sep 16, 2021 | — |
| 425 | Form 425 | Sep 16, 2021 | — |
| 425 | Form 425 | Sep 16, 2021 | — |
| 425 | Form 425 | Sep 16, 2021 | — |
| 8-K |
Current report
Other events
|
Sep 16, 2021 | Sep 15, 2021 |
| 8-K/A |
Amended current report
Officer or director change
|
Aug 23, 2021 | Aug 19, 2021 |
| 8-K |
Current report
Officer or director change
|
Aug 20, 2021 | Aug 19, 2021 |
| 10-Q | Quarterly report | Aug 6, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jul 27, 2021 | Jul 26, 2021 |
| 8-K |
Current report
Officer or director change
|
Jul 15, 2021 | Jul 14, 2021 |
| 8-K |
Current report
Shareholder vote results
|
May 27, 2021 | May 26, 2021 |
| 8-K/A |
Amended current report
Results of operations
|
May 26, 2021 | May 26, 2021 |
| 8-K |
Current report
Results of operations
|
May 26, 2021 | May 26, 2021 |
| 10-Q | Quarterly report | May 7, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Apr 27, 2021 | Apr 26, 2021 |
| DEFA14A | Additional proxy material | Apr 14, 2021 | — |
| DEF 14A | Proxy statement | Apr 14, 2021 | May 26, 2021 |
| 10-K | Annual report | Mar 1, 2021 | Dec 31, 2020 |
| S-8 POS | Filing | Feb 23, 2021 | — |
| S-8 POS | Filing | Feb 23, 2021 | — |
| S-8 POS | Filing | Feb 23, 2021 | — |
| S-8 POS | Filing | Feb 23, 2021 | — |
| 8-K |
Current report
Officer or director change
|
Feb 17, 2021 | Feb 17, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 28, 2021 | Jan 28, 2021 |
| 10-Q | Quarterly report | Nov 4, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 27, 2020 | Oct 26, 2020 |
| 8-K |
Current report
Results of operations, Other events
|
Oct 26, 2020 | Oct 26, 2020 |
| 8-K |
Current report
Other events
|
Sep 14, 2020 | Sep 12, 2020 |
| 8-K |
Current report
Other events
|
Aug 24, 2020 | Aug 21, 2020 |
| 10-Q | Quarterly report | Aug 7, 2020 | Jun 30, 2020 |
| 8-K/A |
Amended current report
Regulation FD disclosure
|
Jul 28, 2020 | Jul 28, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 28, 2020 | Jul 27, 2020 |
| 8-K |
Current report
Results of operations, Other events
|
Jul 27, 2020 | Jul 24, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
May 18, 2020 | May 15, 2020 |
| 424B5 | Prospectus supplement | May 14, 2020 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
May 14, 2020 | May 13, 2020 |
| FWP | Free writing prospectus | May 13, 2020 | — |
| 305B2 | Filing | May 12, 2020 | — |
| 8-K |
Current report
Regulation FD disclosure
|
May 12, 2020 | May 11, 2020 |
| FWP | Free writing prospectus | May 11, 2020 | — |
| 424B5 | Prospectus supplement | May 11, 2020 | — |
| 10-Q | Quarterly report | May 11, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Shareholder vote results, Regulation FD disclosure
|
May 6, 2020 | May 5, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 30, 2020 | Apr 30, 2020 |
| 8-K |
Current report
Results of operations, Other events
|
Apr 30, 2020 | Apr 30, 2020 |
| 8-K |
Current report
Other events
|
Apr 15, 2020 | Apr 15, 2020 |
| DEFA14A | Additional proxy material | Apr 15, 2020 | — |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- State Commercial Banks (SIC 6022)
- Listed as
- FIBK (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Billings, MT
- SEC filer status
- Large accelerated filer
- SEC CIK
- 860413
- Former names
- FIRST INTERSTATE BANCSYSTEM OF MONTANA INC (until Mar 9, 1999)
Other State Commercial Banks companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.