Columbia Banking System, Inc. (COLB)
COLB moved a median of +0.04% 30 minutes after news, and +0.03% by the close. How COLB actually reacts to news — the realized, point-in-time move the market made, measured across 440 labeled events over the last three years with zero look-ahead.
COLB’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 48% | 439 |
| 30-min | +0.04% | 52% | 439 |
| 60-min | +0.02% | 50% | 439 |
| to close | +0.03% | 51% | 439 |
| Middle 50% of COLB reactions | -0.47% to +0.67% |
|---|---|
| Median reaction (30-min) | +0.04% |
| Measured reactions | 440 |
Half of all Columbia Banking System, Inc. news events land between -0.47% and +0.67% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How COLB reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 36 | -0.05% | 44% | -0.18% |
| Analyst downgrades | 25 | +1.36% | 72% | -1.94% |
| Coverage initiations | 22 | -0.43% | 41% | -0.68% |
| Rating reiterations | 107 | +0.03% | 51% | -0.08% |
| Price-target raises | 41 | -0.05% | 44% | -0.06% |
| Price-target cuts | 36 | -0.06% | 42% | -0.13% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. See how COLB ranks against every other measured name →
That’s how COLB usually reacts — get an email when it moves on news →Email me when COLB moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to COLB's baseline. Nothing else.
Recent COLB events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Columbia Banking System Named the Top Performing Large U.S. Bank in Bank Director's 2026 RankingBanking Study | Press release | PR Newswire | +0.00% | +1.18% | |
| Columbia Banking System Announces Date of Third Quarter 2026 Earnings Release and Conference Call | Press release | PR Newswire | +0.56% | -0.35% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Sep 30 | SEC filing · Form 8-K | SEC EDGAR | +0.25% | +1.09% | |
| KBRA Assigns Rating to $250 Million Subordinated Notes Issued by Columbia Bank | Press release | Business Wire | -0.08% | -0.53% | |
| Columbia Bank Names Chris Orr to Lead Trust Sales and Strategic Partnerships for Columbia Private Trust | Press release | PR Newswire | +0.05% | -0.53% | |
| Columbia Banking System Announces Pricing of Subordinated Notes | Press release | PR Newswire | +0.84% | +0.70% | |
| Columbia Banking System to Present at the Barclays Global Financial Services Conference | Press release | PR Newswire | -0.63% | -1.75% | |
| Columbia Banking System Announces $0.37 Per Common Share Dividend | Press release | PR Newswire | +0.22% | +0.71% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Aug 14 | SEC filing · Form 8-K | SEC EDGAR | -0.34% | -1.07% | |
| Columbia Bank Continues Colorado Expansion with First Commercial Office and Retail Branch in Colorado Springs | Press release | PR Newswire | -0.08% | -0.64% | |
| Form 10-Q COLUMBIA BANKING SYSTEM, For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.66% | -1.82% | |
| Columbia Banking System Appoints Simone Lagomarsino to its Board of Directors | Press release | PR Newswire | -0.82% | -0.73% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Jul 28 | SEC filing · Form 8-K | SEC EDGAR | -0.82% | -0.73% | |
| COLUMBIA BANKING SYSTEM, INC. REPORTS SECOND QUARTER 2026 RESULTS | Press release | PR Newswire | +0.23% | +0.35% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Jul 23 | SEC filing · Form 8-K | SEC EDGAR | +0.23% | +0.35% | |
| Columbia Bank and ForgiveCo Partner to Erase $5 Million in Medical Debt for Southern California Veterans | Press release | PR Newswire | -0.19% | -0.09% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Jun 30 | SEC filing · Form 8-K | SEC EDGAR | -0.48% | +1.15% | |
| Columbia Banking System Announces Date of Second Quarter 2026 Earnings Release and Conference Call | Press release | PR Newswire | -0.63% | +0.41% | |
| 2026 COLUMBIA BANK BUSINESS BAROMETER: U.S. Small and Midsize Businesses Poised for Growth, Waiting to Make Significant Moves | Press release | PR Newswire | +0.70% | +1.55% | |
| Form 11-K COLUMBIA BANKING SYSTEM, For: Dec 31 | SEC filing · Form 11-K | SEC EDGAR | -0.22% | +0.09% | |
| Form 11-K/A COLUMBIA BANKING SYSTEM, For: Dec 31 | SEC filing · Form 11-K | SEC EDGAR | +0.81% | -2.37% | |
| Columbia Banking System Announces $0.37 Per Common Share Dividend | Press release | PR Newswire | -0.96% | -1.20% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: May 14 | SEC filing · Form 8-K | SEC EDGAR | -0.04% | +0.14% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: May 15 | SEC filing · Form 8-K | SEC EDGAR | +0.07% | +0.26% | |
| Form 10-Q COLUMBIA BANKING SYSTEM, For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.40% | +0.33% | |
| Columbia Bank Launches Franchise Banking Team | Press release | PR Newswire | -0.03% | -0.34% | |
| COLUMBIA BANKING SYSTEM, INC. REPORTS FIRST QUARTER 2026 RESULTS | Press release | PR Newswire | +2.05% | +0.58% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Apr 23 | SEC filing · Form 8-K | SEC EDGAR | +2.05% | +0.58% | |
| Columbia Bank Receives 2026 Best Bank Honors from Crisil Coalition Greenwich | Press release | PR Newswire | +0.10% | -0.45% | |
| Columbia Banking System Announces Date of First Quarter 2026 Earnings Release and Conference Call | Press release | PR Newswire | -0.18% | +0.70% | |
| Form 11-K COLUMBIA BANKING SYSTEM, For: Dec 31 | SEC filing · Form 11-K | SEC EDGAR | +0.51% | +0.98% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Mar 31 | SEC filing · Form 8-K | SEC EDGAR | -0.18% | +0.11% | |
| Form ARS COLUMBIA BANKING SYSTEM, For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.51% | +0.98% | |
| Form DEF 14A COLUMBIA BANKING SYSTEM, For: May 14 | SEC filing · Form DEF | SEC EDGAR | +0.51% | +0.98% | |
| Form DEFA14A COLUMBIA BANKING SYSTEM, | SEC filing · Form DEFA14A | SEC EDGAR | +0.51% | +0.98% | |
| Form 10-K COLUMBIA BANKING SYSTEM, For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -0.10% | -3.79% | |
| Columbia Banking System to Present at the RBC Capital Markets Conference | Press release | PR Newswire | -0.26% | +1.89% | |
| Columbia Banking System Announces $0.37 Per Common Share Dividend | Press release | PR Newswire | -0.42% | +1.25% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Feb 13 | SEC filing · Form 8-K | SEC EDGAR | -0.16% | -0.13% | |
| COLUMBIA BANKING SYSTEM, INC. REPORTS FOURTH QUARTER 2025 RESULTS | Press release | PR Newswire | -3.35% | -6.84% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Jan 22 | SEC filing · Form 8-K | SEC EDGAR | -3.35% | -6.84% | |
| Clint Stein Elected Chair of Columbia Banking System Board of Directors | Press release | PR Newswire | -0.03% | -0.44% | |
| Columbia Banking System Announces Date of Fourth Quarter 2025 Earnings Release and Conference Call | Press release | PR Newswire | -0.41% | -1.10% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Dec 31 | SEC filing · Form 8-K | SEC EDGAR | +0.10% | -0.24% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Nov 19 | SEC filing · Form 8-K | SEC EDGAR | +0.65% | +3.27% | |
| Columbia Banking System Announces Increase to Common Share Dividend | Press release | PR Newswire | -0.64% | +0.82% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Nov 14 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +0.07% | |
| Form 10-Q COLUMBIA BANKING SYSTEM, For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.28% | -0.60% | |
| HOLDCO ASSET MANAGEMENT RELEASES PRESENTATION TO COLUMBIA BANKING SYSTEM, INC. | Press release | PR Newswire | +0.28% | -0.60% | |
| Form 8-K COLUMBIA BANKING SYSTEM, For: Oct 29 | SEC filing · Form 8-K | SEC EDGAR | +0.34% | -0.11% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the COLB section they belong to.
Where else COLB is measured.
COLB earnings → · Analyst actions → · SEC filings →
Other Financial Services names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Blue Ridge Bankshares, Inc. (BRBS) | 443 | 0.00% | 40% |
| LEGACYTEXAS FINANCIAL GROUP INC (LTXB) | 443 | -0.05% | 47% |
| Hanover Insurance Group Inc (THG) | 440 | +0.17% | 61% |
| KCAP FINANCIAL (KCAP) | 432 | +0.09% | 51% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Financial Services names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Columbia Banking System, Inc.'s median reaction calculated?
Every labeled COLB news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 440 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 52% of COLB's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does COLB's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.