FIBK - CIK 0000860413
FIRST INTERSTATE BANCSYSTEM INC has filed 2,932 documents with the SEC between 1996 and 2026. The most frequent type is insider trade (1,721 filings), alongside the regular cadence of annual reports, quarterly reports, and event disclosures every public company must make. Use the filters to focus on one filing type, or flip the sort to trace the company's history from its earliest paperwork.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.
| Filing | Type | Filed | Period covered |
|---|---|---|---|
| S-3ASR | - | 2026-05-26 | - |
| SCHEDULE 13G/A | - | 2026-05-15 | - |
| Major company event | 8-K | 2026-05-13 | 2026-05-11 |
| Quarterly report | 10-Q | 2026-05-07 | 2026-03-31 |
| Insider trade | 4 | 2026-05-01 | 2026-04-30 |
| Insider sale notice | 144 | 2026-04-30 | - |
| New insider ownership | 3 | 2026-04-29 | 2026-04-29 |
| SCHEDULE 13G | - | 2026-04-29 | - |
| Major company event | 8-K | 2026-04-29 | 2026-04-29 |
| New insider ownership | 3 | 2026-04-28 | 2026-04-25 |
| Proxy materials | DEFA14A | 2026-04-16 | - |
| Proxy statement | DEF 14A | 2026-04-16 | 2025-12-31 |
| Annual report to shareholders | ARS | 2026-04-16 | 2025-12-31 |
| PRE 14A | - | 2026-03-31 | 2026-03-30 |
| Insider trade | 4 | 2026-03-27 | 2026-03-26 |
| SCHEDULE 13G/A | - | 2026-03-26 | - |
| Insider trade | 4 | 2026-03-18 | 2026-03-16 |
| Insider trade | 4 | 2026-03-18 | 2026-03-16 |
| Insider trade | 4 | 2026-03-18 | 2026-03-16 |
| Insider trade | 4 | 2026-03-18 | 2026-03-16 |
| Insider trade | 4 | 2026-03-18 | 2026-03-16 |
| Insider trade | 4 | 2026-03-17 | 2026-03-15 |
| Insider trade | 4 | 2026-03-17 | 2026-03-15 |
| Insider trade | 4 | 2026-03-17 | 2026-03-15 |
| Insider trade | 4 | 2026-03-17 | 2026-03-15 |
| Insider trade | 4 | 2026-03-17 | 2026-03-15 |
| Insider trade | 4 | 2026-03-17 | 2026-03-15 |
| Insider trade | 4 | 2026-03-17 | 2026-03-15 |
| SCHEDULE 13G/A | - | 2026-03-05 | - |
| Annual report | 10-K | 2026-02-26 | 2025-12-31 |
| Annual insider summary | 5 | 2026-02-18 | 2025-12-31 |
| Annual insider summary | 5 | 2026-02-17 | 2025-12-31 |
| Annual insider summary | 5 | 2026-02-17 | 2025-12-31 |
| Annual insider summary | 5 | 2026-02-17 | 2025-12-31 |
| Insider sale notice | 144 | 2026-02-11 | - |
| SCHEDULE 13G | - | 2026-02-09 | - |
| Insider sale notice | 144 | 2026-02-03 | - |
| SCHEDULE 13G/A | - | 2026-01-30 | - |
| Major company event | 8-K | 2026-01-28 | 2026-01-28 |
| SCHEDULE 13G/A | - | 2026-01-08 | - |
| Insider trade | 4 | 2026-01-06 | 2026-01-05 |
| Insider trade | 4 | 2026-01-06 | 2025-12-08 |
| Insider sale notice | 144 | 2026-01-05 | - |
| Insider trade | 4 | 2025-12-15 | 2025-12-08 |
| Insider trade | 4 | 2025-12-10 | 2025-12-08 |
| Insider trade | 4 | 2025-12-04 | 2025-12-03 |
| Insider trade | 4 | 2025-12-01 | 2025-12-01 |
| Insider trade | 4 | 2025-11-25 | 2025-11-21 |
| Insider trade | 4 | 2025-11-24 | 2025-11-24 |
| Insider sale notice | 144 | 2025-11-24 | - |