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 |
|---|---|---|---|
| DEFA14A | Additional proxy material | Apr 16, 2026 | — |
| DEF 14A | Proxy statement | Apr 16, 2026 | Dec 31, 2025 |
| PRE 14A | Preliminary proxy statement | Mar 31, 2026 | Mar 30, 2026 |
| DEFA14A | Additional proxy material | May 16, 2025 | — |
| DEFA14A | Additional proxy material | Apr 8, 2025 | — |
| DEF 14A | Proxy statement | Apr 8, 2025 | Apr 8, 2025 |
| DEFA14A | Additional proxy material | May 7, 2024 | — |
| DEFA14A | Additional proxy material | Apr 30, 2024 | — |
| DEFA14A | Additional proxy material | Apr 11, 2024 | — |
| DEF 14A | Proxy statement | Apr 11, 2024 | Apr 11, 2024 |
| DEFA14A | Additional proxy material | May 12, 2023 | — |
| DEFA14A | Additional proxy material | May 5, 2023 | — |
| DEFA14A | Additional proxy material | Apr 11, 2023 | — |
| DEF 14A | Proxy statement | Apr 11, 2023 | — |
| PRE 14A | Preliminary proxy statement | Mar 10, 2023 | — |
| DEFA14A | Additional proxy material | Apr 14, 2022 | — |
| DEF 14A | Proxy statement | Apr 14, 2022 | May 25, 2022 |
| DEFA14A | Additional proxy material | Apr 14, 2021 | — |
| DEF 14A | Proxy statement | Apr 14, 2021 | May 26, 2021 |
| DEFA14A | Additional proxy material | Apr 15, 2020 | — |
| DEF 14A | Proxy statement | Mar 20, 2020 | May 5, 2020 |
| DEF 14A | Proxy statement | Mar 15, 2019 | May 2, 2019 |
| PRE 14A | Preliminary proxy statement | Mar 1, 2019 | May 2, 2019 |
Showing 23 filings. 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.