# First Interstate Bancsystem Inc: filings

FIBK · Nasdaq · CIK 860413 · [Financials](/sectors/financials.md) · fiscal year ends Dec 31

Pages: [Overview](/companies/fibk.md) · [Financials](/companies/fibk/financials.md) · [Filings](/companies/fibk/filings.md) · [Insiders](/companies/fibk/insiders.md)

## Reports and events: 401 filings

Newest first, by EDGAR acceptance time (Eastern). Filter with ?form= one of: `periodic`, `8-K`, `10-K`, `10-Q`, `4`, `proxy`, `13dg`, `all`, or any form this company filed (4 1245, 8-K 276, 4/A 83, SC 13G/A 74, 144 70, 3 70, 10-Q 53, 425 40, SC 13D/A 22, 10-K 18, DEF 14A 18, UPLOAD 18, SC 13G 17, CORRESP 16, DEFA14A 16, EFFECT 14, 5 13, S-8 POS 11, 8-K/A 9, SCHEDULE 13G/A 8, POS AM 7, S-4/A 7, 3/A 6, FWP 6, S-4 6, 424B3 5, 424B5 4, 8-A12B/A 4, ARS 4, PRE 14A 4, S-8 4, SCHEDULE 13G 4, S-1/A 3, S-3ASR 3, 11-K 2, 144/A 2, 305B2 2, 8-A12G/A 2, RW 2, S-3 2, 11-K/A 1, 13F-HR 1, 15-12G 1, 15-15D 1, 424B4 1, 5/A 1, 8-A12B 1, CERTNAS 1, PRER14A 1, RW WD 1, S-1 1, S-1MEF 1, SC 13D 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-10-22 | 16:10 ET | [8-K](/filings/0000860413-26-000097.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0000860413-26-000097 |
| 2026-09-16 | 14:06 ET | [8-K](/filings/0000860413-26-000092.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-26-000092 |
| 2026-08-21 | 09:20 ET | [8-K](/filings/0000860413-26-000088.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-26-000088 |
| 2026-08-03 | 16:01 ET | [10-Q](/filings/0000860413-26-000084.md) | Quarterly report, period 2026-06-30 | 0000860413-26-000084 |
| 2026-07-23 | 16:14 ET | [8-K](/filings/0000860413-26-000081.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0000860413-26-000081 |
| 2026-07-16 | 16:06 ET | [8-K](/filings/0000860413-26-000078.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-26-000078 |
| 2026-07-09 | 16:02 ET | [8-K](/filings/0000860413-26-000075.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-26-000075 |
| 2026-05-29 | 16:26 ET | [8-K](/filings/0000860413-26-000048.md) | 5.02 Departure or appointment of officers or directors; 5.03 Amendment to articles or bylaws; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0000860413-26-000048 |
| 2026-05-13 | 17:12 ET | [8-K](/filings/0000860413-26-000041.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-26-000041 |
| 2026-05-07 | 16:10 ET | [10-Q](/filings/0000860413-26-000038.md) | Quarterly report, period 2026-03-31 | 0000860413-26-000038 |
| 2026-04-29 | 16:12 ET | [8-K](/filings/0000860413-26-000034.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0000860413-26-000034 |
| 2026-04-16 | 16:09 ET | [DEF 14A](/filings/0000860413-26-000025.md) | Proxy statement, period 2025-12-31 | 0000860413-26-000025 |
| 2026-02-26 | 16:19 ET | [10-K](/filings/0000860413-26-000011.md) | Annual report, period 2025-12-31 | 0000860413-26-000011 |
| 2026-01-28 | 16:10 ET | [8-K](/filings/0000860413-26-000007.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0000860413-26-000007 |
| 2025-11-18 | 09:15 ET | [8-K](/filings/0000860413-25-000168.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-25-000168 |
| 2025-11-06 | 15:22 ET | [10-Q](/filings/0000860413-25-000165.md) | Quarterly report, period 2025-09-30 | 0000860413-25-000165 |
| 2025-10-29 | 16:06 ET | [8-K](/filings/0000860413-25-000160.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 8.01 Other events | 0000860413-25-000160 |
| 2025-10-16 | 16:01 ET | [8-K](/filings/0000860413-25-000155.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000860413-25-000155 |
| 2025-10-14 | 10:01 ET | [8-K](/filings/0000860413-25-000152.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000860413-25-000152 |
| 2025-09-09 | 16:48 ET | [8-K](/filings/0000860413-25-000147.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000860413-25-000147 |
| 2025-09-02 | 08:32 ET | [8-K](/filings/0000860413-25-000137.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-25-000137 |
| 2025-08-29 | 16:20 ET | [8-K/A](/filings/0000860413-25-000135.md) | 5.02 Departure or appointment of officers or directors | 0000860413-25-000135 |
| 2025-08-28 | 16:35 ET | [8-K](/filings/0000860413-25-000129.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000860413-25-000129 |
| 2025-08-18 | 17:11 ET | [8-K](/filings/0000860413-25-000122.md) | 1.02 Termination of a material agreement; 8.01 Other events; 9.01 Financial statements and exhibits | 0000860413-25-000122 |
| 2025-08-15 | 13:31 ET | [8-K](/filings/0000860413-25-000119.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-25-000119 |
| 2025-08-06 | 16:16 ET | [10-Q](/filings/0000860413-25-000117.md) | Quarterly report, period 2025-06-30 | 0000860413-25-000117 |
| 2025-07-29 | 16:21 ET | [8-K](/filings/0000860413-25-000114.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0000860413-25-000114 |
| 2025-07-03 | 16:09 ET | [8-K](/filings/0001104659-25-065784.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-25-065784 |
| 2025-06-10 | 16:30 ET | [8-K](/filings/0001104659-25-058170.md) | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001104659-25-058170 |
| 2025-06-06 | 16:27 ET | [8-K](/filings/0001104659-25-057359.md) | 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-25-057359 |
| 2025-06-02 | 10:03 ET | [8-K](/filings/0000860413-25-000078.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000860413-25-000078 |
| 2025-06-02 | 09:26 ET | [8-K](/filings/0000860413-25-000077.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000860413-25-000077 |
| 2025-05-23 | 16:35 ET | [8-K](/filings/0000860413-25-000070.md) | 5.02 Departure or appointment of officers or directors; 5.03 Amendment to articles or bylaws; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0000860413-25-000070 |
| 2025-05-07 | 14:47 ET | [10-Q](/filings/0000860413-25-000060.md) | Quarterly report, period 2025-03-31 | 0000860413-25-000060 |
| 2025-04-29 | 16:09 ET | [8-K](/filings/0000860413-25-000057.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0000860413-25-000057 |
| 2025-04-28 | 16:05 ET | [8-K](/filings/0000860413-25-000051.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000860413-25-000051 |
| 2025-04-08 | 16:03 ET | [DEF 14A](/filings/0000860413-25-000045.md) | Proxy statement, period 2025-04-08 | 0000860413-25-000045 |
| 2025-03-19 | 17:15 ET | [8-K](/filings/0000860413-25-000036.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-25-000036 |
| 2025-02-28 | 17:31 ET | [10-K](/filings/0000860413-25-000022.md) | Annual report, period 2024-12-31 | 0000860413-25-000022 |
| 2025-02-26 | 18:36 ET | [8-K](/filings/0000860413-25-000017.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-25-000017 |
| 2025-02-25 | 08:30 ET | [8-K](/filings/0000860413-25-000015.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000860413-25-000015 |
| 2025-01-29 | 16:28 ET | [8-K](/filings/0000860413-25-000006.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0000860413-25-000006 |
| 2025-01-10 | 08:53 ET | [8-K](/filings/0000860413-25-000003.md) | 2.02 Results of operations; 2.06 Material impairments; 9.01 Financial statements and exhibits | 0000860413-25-000003 |
| 2024-11-04 | 16:42 ET | [10-Q](/filings/0000860413-24-000130.md) | Quarterly report, period 2024-09-30 | 0000860413-24-000130 |
| 2024-10-24 | 16:17 ET | [8-K](/filings/0000860413-24-000128.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0000860413-24-000128 |
| 2024-10-09 | 17:12 ET | [8-K](/filings/0000860413-24-000125.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000860413-24-000125 |
| 2024-08-02 | 11:56 ET | [10-Q](/filings/0000860413-24-000118.md) | Quarterly report, period 2024-06-30 | 0000860413-24-000118 |
| 2024-07-25 | 16:01 ET | [8-K](/filings/0000860413-24-000111.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0000860413-24-000111 |
| 2024-07-12 | 16:03 ET | [8-K](/filings/0000860413-24-000108.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-24-000108 |
| 2024-06-14 | 06:56 ET | [8-K](/filings/0000860413-24-000106.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0000860413-24-000106 |

Page 1 of 9. [Older](/companies/fibk/filings.md?page=2)
Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 30, 2026, 16:03 ET. No prices; not investment advice.