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 |
|---|---|---|---|
| S-3ASR | Automatic shelf registration | May 26, 2026 | — |
| 424B5 | Prospectus supplement | Jun 6, 2025 | — |
| FWP | Free writing prospectus | Jun 5, 2025 | — |
| FWP | Free writing prospectus | Jun 5, 2025 | — |
| 424B5 | Prospectus supplement | Jun 5, 2025 | — |
| S-8 | Employee stock plan registration | May 23, 2024 | — |
| S-3ASR | Automatic shelf registration | May 26, 2023 | — |
| S-8 | Employee stock plan registration | May 25, 2023 | — |
| S-8 POS | Filing | Jan 9, 2023 | — |
| S-8 POS | Filing | Jan 9, 2023 | — |
| 424B3 | Prospectus | Dec 16, 2021 | — |
| S-4/A | Filing | Dec 14, 2021 | — |
| S-4 | Registration for a merger or exchange | Nov 4, 2021 | — |
| 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 | — |
| 424B5 | Prospectus supplement | May 14, 2020 | — |
| FWP | Free writing prospectus | May 13, 2020 | — |
| FWP | Free writing prospectus | May 11, 2020 | — |
| 424B5 | Prospectus supplement | May 11, 2020 | — |
| POS AM | Filing | Mar 18, 2020 | — |
| S-3ASR | Automatic shelf registration | Mar 16, 2020 | — |
| POS AM | Post-effective amendment no. 1 to form s-4 | May 1, 2019 | — |
| POS AM | Post-effective amendment no. 1 to form s-4 | May 1, 2019 | — |
| 424B3 | Prospectus | Feb 7, 2019 | — |
| 424B3 | Prospectus | Feb 7, 2019 | — |
| S-4/A | Filing | Jan 16, 2019 | — |
| S-4/A | Filing | Jan 16, 2019 | — |
| S-4 | Registration for a merger or exchange | Nov 28, 2018 | — |
| S-4 | Registration for a merger or exchange | Nov 28, 2018 | — |
| POS AM | S-4 pos am | Sep 5, 2018 | — |
| 424B3 | Prospectus | Jul 9, 2018 | — |
| S-4/A | Filing | Jul 2, 2018 | — |
Showing 34 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.