# Columbia Banking System, Inc. (COLB) insider trading, Q3 2026

Canonical: https://sec-api.dev/insider-trading/colb

> 5 non-derivative transactions: 1 purchase ($22K), 0 sales. CIK 887343.

| Date | Insider | Relationship | Code | Shares | Price | Owned after | Filing |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 2026-09-04 | GARDNER STEVEN R | Director | A | 2577.0 | 0.0 | 2577.0 | https://www.sec.gov/Archives/edgar/data/887343/000126734226000003/0001267342-26-000003-index.htm |
| 2026-09-02 | LAGOMARSINO SIMONE | Director | A | 2670.0 | 0.0 | 2670.0 | https://www.sec.gov/Archives/edgar/data/887343/000108496026000007/0001084960-26-000007-index.htm |
| 2026-08-14 | Giem Judi | Officer | M | 2393.0 | 32.69 | 2393.0 | https://www.sec.gov/Archives/edgar/data/887343/000088734326000174/0000887343-26-000174-index.htm |
| 2026-08-14 | Giem Judi | Officer | F | 643.0 | 32.69 | 1750.0 | https://www.sec.gov/Archives/edgar/data/887343/000088734326000174/0000887343-26-000174-index.htm |
| 2026-06-30 | Deer Aaron James | Officer | P | 886.0 | 25.37 | 42761.0 | https://www.sec.gov/Archives/edgar/data/887343/000088734326000161/0000887343-26-000161-index.htm |

Source: https://www.sec.gov/data-research/sec-markets-data/insider-transactions-data-sets

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