🕵️ Columbia Banking System, Inc. ($COLB)
SEC insider & ownership activity, last 12 months · CIK 887343 · every row links its SEC filing
Over the last 12 months insiders sold $677K against $22K of open-market buying. Steven R. Gardner sold $404K in discretionary trades (Jan). No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
1 buyer, $22K (1 lots) · 5 sellers, $677K (7 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Steven R. Gardner | 0 | – | 1 | $404K | Jan 30, 2026 |
| Torran B. Nixon | 0 | – | 2 | $128K | Mar 4, 2026 |
| Moore Devine David | 0 | – | 2 | $115K | Jun 8, 2026 |
| Baruffi Kumi Yamamoto | 0 | – | 1 | $25K | Mar 13, 2026 |
| Deer Aaron James | 1 | $22K | 0 | – | Jun 30, 2026 |
| Lakely Brock | 0 | – | 1 | $6K | Mar 13, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Wellington Management Group LLP | 6.1% | 13G | Feb 10, 2026 | filing ↗ | |
| Wellington Group Holdings LLP | 6.1% | 13G | Feb 10, 2026 | filing ↗ | |
| Wellington Investment Advisors Holdings LLP | 6.1% | 13G | Feb 10, 2026 | filing ↗ | |
| Wellington Management Company LLP | 5.8% | 13G | Feb 10, 2026 | filing ↗ | |
| Vanguard Capital Management | 5.2% | 13G | Apr 29, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Moore Devine David | $115K | Jun 8, 2026 | filing ↗ |
| Torran B. Nixon | $65K | Mar 4, 2026 | filing ↗ |
| Torran B. Nixon | $63K | Mar 3, 2026 | filing ↗ |
| Steven R. Gardner | $404K | Jan 30, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Jul 23, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jul 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jul 23, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jun 30, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 30, 2026 | filing ↗ |
| Other events (8.01) | May 15, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 15, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 14, 2026 | filing ↗ |
| Earnings (2.02) | Apr 23, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 23, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Mar 31, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 31, 2026 | filing ↗ |
| Other events (8.01) | Feb 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 13, 2026 | filing ↗ |
| Earnings (2.02) | Jan 22, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 22, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 22, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Dec 31, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 31, 2025 | filing ↗ |
| Officer/director changes (5.02) | Nov 19, 2025 | filing ↗ |
| Other events (8.01) | Nov 14, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 14, 2025 | filing ↗ |
| Earnings (2.02) | Oct 30, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Oct 30, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 30, 2025 | filing ↗ |
| Officer/director changes (5.02) | Oct 29, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Oct 29, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 29, 2025 | filing ↗ |
| Acquisition or disposition (2.01) | Sep 2, 2025 | filing ↗ |