Columbia Banking System, Inc. (COLB) ownership: Top institutional holder: VANGUARD GROUP INC ($829.49M). Insider activity: Net Seller (0 buys, 20 sells). 4 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| VANGUARD GROUP INC | 29677731.00 | $829.49M | 2025-12-31 |
| BlackRock, Inc. | 27065001.00 | $742.39M | 2026-03-31 |
| T. Rowe Price Investment Management, Inc. | 15915525.00 | $436.56M | 2026-03-31 |
| WELLINGTON MANAGEMENT GROUP LLP | 14944275.00 | $409.92M | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 14339716.00 | $393.34M | 2026-03-31 |
| DIMENSIONAL FUND ADVISORS LP | 13549603.00 | $371.66M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 13224625.00 | $362.75M | 2026-03-31 |
| STATE STREET CORP | 12476160.00 | $342.22M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-15 | |
| Sell | null | 2026-06-08 | |
| Sell | null | 2026-06-08 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 | |
| Sell | null | 2026-05-14 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.