# Columbia Banking System, Inc.: filings

COLB · Nasdaq · CIK 887343 · [Financials](/sectors/financials.md) · fiscal year ends Dec 31

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

## Reports and events: 331 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 (4 868, 8-K 229, 10-Q 53, 425 47, SC 13G/A 47, 3 46, 5 29, 4/A 27, 10-K 18, DEF 14A 18, CORRESP 17, SC 13G 15, UPLOAD 14, DEFA14A 11, S-8 11, 8-K/A 10, EFFECT 9, S-4/A 9, 424B3 8, 3/A 7, 11-K 6, 144 6, S-4 6, ARS 4, S-3ASR 4, 10-K/A 2, 424B5 2, PRE 14A 2, S-3MEF 2, SCHEDULE 13G 2, SCHEDULE 13G/A 2, 10-Q/A 1, 11-K/A 1, DEFM14A 1, POS AM 1, S-3 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-10-27 | 16:03 ET | [8-K](/filings/0001193125-26-434182.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001193125-26-434182 |
| 2026-10-22 | 16:15 ET | [8-K](/filings/0000887343-26-000184.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-26-000184 |
| 2026-09-30 | 17:07 ET | [8-K](/filings/0000887343-26-000181.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-26-000181 |
| 2026-08-14 | 16:35 ET | [8-K](/filings/0000887343-26-000173.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000887343-26-000173 |
| 2026-08-04 | 17:29 ET | [10-Q](/filings/0000887343-26-000170.md) | Quarterly report, period 2026-06-30 | 0000887343-26-000170 |
| 2026-07-30 | 17:27 ET | [8-K](/filings/0000887343-26-000167.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-26-000167 |
| 2026-07-23 | 16:31 ET | [8-K](/filings/0000887343-26-000165.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-26-000165 |
| 2026-07-01 | 18:00 ET | [8-K](/filings/0000887343-26-000159.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-26-000159 |
| 2026-05-15 | 13:42 ET | [8-K](/filings/0000887343-26-000143.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000887343-26-000143 |
| 2026-05-15 | 13:39 ET | [8-K](/filings/0000887343-26-000142.md) | 5.07 Shareholder vote results | 0000887343-26-000142 |
| 2026-05-05 | 16:32 ET | [10-Q](/filings/0000887343-26-000135.md) | Quarterly report, period 2026-03-31 | 0000887343-26-000135 |
| 2026-04-23 | 16:13 ET | [8-K](/filings/0000887343-26-000132.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-26-000132 |
| 2026-03-31 | 17:21 ET | [DEF 14A](/filings/0000887343-26-000126.md) | Proxy statement, period 2026-05-14 | 0000887343-26-000126 |
| 2026-03-31 | 13:33 ET | [8-K](/filings/0000887343-26-000116.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-26-000116 |
| 2026-02-26 | 16:31 ET | [10-K](/filings/0000887343-26-000088.md) | Annual report, period 2025-12-31 | 0000887343-26-000088 |
| 2026-02-13 | 13:21 ET | [8-K](/filings/0000887343-26-000039.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000887343-26-000039 |
| 2026-01-22 | 17:24 ET | [8-K](/filings/0000887343-26-000012.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-26-000012 |
| 2025-12-31 | 12:13 ET | [8-K](/filings/0000887343-25-000280.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-25-000280 |
| 2025-11-21 | 08:45 ET | [8-K](/filings/0001193125-25-290691.md) | 5.02 Departure or appointment of officers or directors | 0001193125-25-290691 |
| 2025-11-14 | 14:44 ET | [8-K](/filings/0000887343-25-000271.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000887343-25-000271 |
| 2025-11-06 | 17:35 ET | [10-Q](/filings/0000887343-25-000268.md) | Quarterly report, period 2025-09-30 | 0000887343-25-000268 |
| 2025-11-04 | 16:02 ET | [8-K](/filings/0001193125-25-264630.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-264630 |
| 2025-10-30 | 16:51 ET | [8-K](/filings/0000887343-25-000262.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-25-000262 |
| 2025-09-03 | 08:16 ET | [8-K/A](/filings/0000887343-25-000242.md) | 9.01 Financial statements and exhibits | 0000887343-25-000242 |
| 2025-09-02 | 08:01 ET | [8-K](/filings/0001193125-25-193405.md) | 2.01 Completion of an acquisition or disposition; 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-193405 |
| 2025-08-29 | 13:47 ET | [8-K](/filings/0000887343-25-000238.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-25-000238 |
| 2025-08-15 | 12:18 ET | [8-K](/filings/0000887343-25-000236.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000887343-25-000236 |
| 2025-08-06 | 17:15 ET | [10-Q](/filings/0000887343-25-000233.md) | Quarterly report, period 2025-06-30 | 0000887343-25-000233 |
| 2025-08-06 | 16:49 ET | [8-K](/filings/0000887343-25-000229.md) | 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0000887343-25-000229 |
| 2025-07-24 | 16:30 ET | [8-K](/filings/0000887343-25-000221.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-25-000221 |
| 2025-07-22 | 17:59 ET | [8-K](/filings/0000887343-25-000212.md) | 5.07 Shareholder vote results; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-25-000212 |
| 2025-07-11 | 16:45 ET | [8-K](/filings/0001193125-25-158231.md) | 8.01 Other events | 0001193125-25-158231 |
| 2025-06-30 | 16:51 ET | [8-K](/filings/0000887343-25-000208.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-25-000208 |
| 2025-05-16 | 16:34 ET | [8-K](/filings/0000887343-25-000172.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000887343-25-000172 |
| 2025-05-15 | 17:19 ET | [8-K](/filings/0000887343-25-000169.md) | 5.07 Shareholder vote results | 0000887343-25-000169 |
| 2025-05-06 | 16:32 ET | [10-Q](/filings/0000887343-25-000166.md) | Quarterly report, period 2025-03-31 | 0000887343-25-000166 |
| 2025-05-05 | 17:17 ET | [8-K](/filings/0000887343-25-000163.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-25-000163 |
| 2025-04-25 | 06:15 ET | [8-K](/filings/0001193125-25-094676.md) | 1.01 Entry into a material agreement; 9.01 Financial statements and exhibits | 0001193125-25-094676 |
| 2025-04-23 | 17:04 ET | [8-K](/filings/0001193125-25-091469.md) | 7.01 Regulation FD disclosure; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-25-091469 |
| 2025-04-23 | 16:32 ET | [8-K](/filings/0000887343-25-000159.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-25-000159 |
| 2025-04-03 | 16:32 ET | [DEF 14A](/filings/0000887343-25-000152.md) | Proxy statement, period 2025-05-15 | 0000887343-25-000152 |
| 2025-04-02 | 16:32 ET | [8-K](/filings/0000887343-25-000143.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-25-000143 |
| 2025-03-31 | 15:02 ET | [8-K](/filings/0000887343-25-000133.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-25-000133 |
| 2025-03-27 | 16:35 ET | [8-K](/filings/0000887343-25-000130.md) | 7.01 Regulation FD disclosure | 0000887343-25-000130 |
| 2025-02-25 | 16:32 ET | [10-K](/filings/0000887343-25-000054.md) | Annual report, period 2024-12-31 | 0000887343-25-000054 |
| 2025-02-14 | 14:16 ET | [8-K](/filings/0000887343-25-000022.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000887343-25-000022 |
| 2025-01-23 | 16:31 ET | [8-K](/filings/0000887343-25-000015.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-25-000015 |
| 2024-12-31 | 13:09 ET | [8-K](/filings/0000887343-24-000275.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0000887343-24-000275 |
| 2024-11-15 | 16:01 ET | [8-K](/filings/0000887343-24-000265.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0000887343-24-000265 |
| 2024-11-05 | 16:36 ET | [10-Q](/filings/0000887343-24-000262.md) | Quarterly report, period 2024-09-30 | 0000887343-24-000262 |

Page 1 of 7. [Older](/companies/colb/filings.md?page=2)
Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 30, 2026, 18:49 ET. No prices; not investment advice.