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 |
|---|---|---|---|
| 4 | Insider transaction | Nov 3, 2026 | Oct 30, 2026 |
| 10-Q | Quarterly report | Nov 2, 2026 | Sep 30, 2026 |
| 144 | Notice of proposed sale | Nov 2, 2026 | — |
| 144 | Notice of proposed sale | Oct 30, 2026 | — |
| 4 | Insider transaction | Oct 26, 2026 | Oct 23, 2026 |
| 4 | Insider transaction | Oct 23, 2026 | Oct 22, 2026 |
| 144 | Notice of proposed sale | Oct 22, 2026 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Oct 22, 2026 | Oct 22, 2026 |
| 4 | Insider transaction | Oct 6, 2026 | Oct 5, 2026 |
| 4 | Insider transaction | Sep 22, 2026 | Sep 10, 2026 |
| 4 | Insider transaction | Sep 16, 2026 | Sep 16, 2026 |
| 8-K |
Current report
Officer or director change
|
Sep 16, 2026 | Sep 14, 2026 |
| 4 | Insider transaction | Sep 16, 2026 | Sep 14, 2026 |
| 3 | Initial insider ownership | Sep 15, 2026 | Sep 14, 2026 |
| 4 | Insider transaction | Sep 14, 2026 | Sep 14, 2026 |
| 4 | Insider transaction | Sep 14, 2026 | Sep 11, 2026 |
| 144 | Notice of proposed sale | Sep 11, 2026 | — |
| 8-K |
Current report
Officer or director change
|
Aug 21, 2026 | Aug 21, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 7, 2026 | — |
| 10-Q | Quarterly report | Aug 3, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 28, 2026 | Jul 27, 2026 |
| 4 | Insider transaction | Jul 24, 2026 | Jul 22, 2026 |
| 4 | Insider transaction | Jul 24, 2026 | Jul 22, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jul 23, 2026 | Jul 23, 2026 |
| 3 | Initial insider ownership | Jul 21, 2026 | Jul 13, 2026 |
| 3 | Initial insider ownership | Jul 21, 2026 | Jul 13, 2026 |
| 4 | Insider transaction | Jul 16, 2026 | Jul 16, 2026 |
| 144 | Notice of proposed sale | Jul 16, 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 |
| 4 | Insider transaction | Jun 18, 2026 | Jun 18, 2026 |
| 144 | Notice of proposed sale | Jun 18, 2026 | — |
| 4 | Insider transaction | Jun 18, 2026 | Jun 18, 2026 |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 144 | Notice of proposed sale | Jun 17, 2026 | — |
| 4 | Insider transaction | Jun 4, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 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 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 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 |
| 4 | Insider transaction | May 1, 2026 | Apr 30, 2026 |
| 144 | Notice of proposed sale | Apr 30, 2026 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Apr 29, 2026 | Apr 29, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 29, 2026 | — |
| 3 | Initial insider ownership | Apr 29, 2026 | Apr 29, 2026 |
| 3 | Initial insider ownership | Apr 28, 2026 | Apr 25, 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 |
| 4 | Insider transaction | Mar 27, 2026 | Mar 26, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 4 | Insider transaction | Mar 18, 2026 | Mar 16, 2026 |
| 4 | Insider transaction | Mar 18, 2026 | Mar 16, 2026 |
| 4 | Insider transaction | Mar 18, 2026 | Mar 16, 2026 |
| 4 | Insider transaction | Mar 18, 2026 | Mar 16, 2026 |
| 4 | Insider transaction | Mar 18, 2026 | Mar 16, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 5, 2026 | — |
| 10-K | Annual report | Feb 26, 2026 | Dec 31, 2025 |
| 5 | Annual insider ownership | Feb 18, 2026 | Dec 31, 2025 |
| 5 | Annual insider ownership | Feb 17, 2026 | Dec 31, 2025 |
| 5 | Annual insider ownership | Feb 17, 2026 | Dec 31, 2025 |
| 5 | Annual insider ownership | Feb 17, 2026 | Dec 31, 2025 |
| 144 | Notice of proposed sale | Feb 11, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 9, 2026 | — |
| 144 | Notice of proposed sale | Feb 3, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 30, 2026 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jan 28, 2026 | Jan 28, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 8, 2026 | — |
| 4 | Insider transaction | Jan 6, 2026 | Jan 5, 2026 |
| 4 | Insider transaction | Jan 6, 2026 | Dec 8, 2025 |
| 144 | Notice of proposed sale | Jan 5, 2026 | — |
| 4 | Insider transaction | Dec 15, 2025 | Dec 8, 2025 |
| 4 | Insider transaction | Dec 10, 2025 | Dec 8, 2025 |
| 4 | Insider transaction | Dec 4, 2025 | Dec 3, 2025 |
| 4 | Insider transaction | Dec 1, 2025 | Dec 1, 2025 |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 4 | Insider transaction | Nov 24, 2025 | Nov 24, 2025 |
| 144 | Notice of proposed sale | Nov 24, 2025 | — |
| 8-K |
Current report
Officer or director change
|
Nov 18, 2025 | Nov 14, 2025 |
| 4 | Insider transaction | Nov 14, 2025 | Nov 12, 2025 |
| 4 | Insider transaction | Nov 12, 2025 | Sep 9, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Nov 12, 2025 | — |
| 144 | Notice of proposed sale | Nov 12, 2025 | — |
| 144 | Notice of proposed sale | Nov 10, 2025 | — |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 4, 2025 | — |
| 4 | Insider transaction | Nov 3, 2025 | Nov 3, 2025 |
| 4 | Insider transaction | Nov 3, 2025 | Nov 3, 2025 |
| 144 | Notice of proposed sale | Nov 3, 2025 | — |
| 4 | Insider transaction | Oct 29, 2025 | Oct 29, 2025 |
| 144 | Notice of proposed sale | Oct 29, 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 |
| 4 | Insider transaction | Oct 9, 2025 | Sep 10, 2025 |
| 3 | Initial insider ownership | Oct 9, 2025 | Sep 10, 2025 |
| 4 | Insider transaction | Oct 9, 2025 | Oct 9, 2025 |
| 4 | Insider transaction | Oct 8, 2025 | Oct 7, 2025 |
| 144/A | Filing | Oct 8, 2025 | — |
| 144 | Notice of proposed sale | Oct 7, 2025 | — |
| 4 | Insider transaction | Oct 3, 2025 | Sep 9, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Sep 9, 2025 | Sep 3, 2025 |
| 4 | Insider transaction | Sep 9, 2025 | Sep 5, 2025 |
| 4 | Insider transaction | Sep 5, 2025 | Aug 5, 2025 |
| 3 | Initial insider ownership | Sep 5, 2025 | Aug 29, 2025 |
| 144 | Notice of proposed sale | Sep 2, 2025 | — |
| 4 | Insider transaction | Sep 2, 2025 | Sep 2, 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 |
| 4 | Insider transaction | Aug 29, 2025 | Aug 27, 2025 |
| 8-K |
Current report
Other events
|
Aug 28, 2025 | Aug 28, 2025 |
| 3 | Initial insider ownership | Aug 21, 2025 | Aug 13, 2025 |
| 4 | Insider transaction | Aug 18, 2025 | Aug 14, 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 |
| 144 | Notice of proposed sale | Aug 14, 2025 | — |
| 10-Q | Quarterly report | Aug 6, 2025 | Jun 30, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 6, 2025 | — |
| 4 | Insider transaction | Aug 1, 2025 | Aug 1, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jul 29, 2025 | Jul 29, 2025 |
| 5 | Annual insider ownership | Jul 18, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jul 15, 2025 | Jul 14, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 15, 2025 | — |
| 144 | Notice of proposed sale | Jul 14, 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 |
| 3/A | Form 3/a | Jun 5, 2025 | Jun 1, 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 | — |
| 3 | Initial insider ownership | Jun 4, 2025 | Jun 1, 2025 |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 2025 |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 2025 |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 2025 |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 2025 |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 2025 |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 2025 |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 2025 |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 2025 |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 2025 |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 2025 |
| 4 | Insider transaction | Jun 3, 2025 | Jun 1, 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 |
| 4 | Insider transaction | May 30, 2025 | May 24, 2023 |
| 4 | Insider transaction | May 29, 2025 | May 28, 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 |
| 3 | Initial insider ownership | Apr 29, 2025 | Apr 22, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 28, 2025 | Apr 28, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 17, 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 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 10-K | Annual report | Feb 28, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Feb 26, 2025 | Feb 26, 2025 |
| 144 | Notice of proposed sale | Feb 26, 2025 | — |
| 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 |
| 4 | Insider transaction | Feb 18, 2025 | Feb 14, 2025 |
| 144 | Notice of proposed sale | Feb 14, 2025 | — |
| 4 | Insider transaction | Feb 14, 2025 | Oct 30, 2024 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 12, 2025 | — |
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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.