NASDAQ:COLB

Columbia Banking System Stock Insider Trading

Financial Services > Banks - Regional

Buy COLB

*Your capital is at risk

$31.27

+0.0200 (+0.0640%)

At Close: Jul 31, 2026

Columbia Banking System Stock Insider Power

Based on the 100 latest insides trades, we have calculated the insider power to be positive at 33.61. In total, the insiders bought 363.14K and sold 103.13K COLB shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.

Insider Power (Last 100 transactions)	33.61
● Buy	363.14K shares
● Sell	103.13K shares
55% Buy Activity Negligible or No Correlation
Buy Signal Medium Confidence Feb 18, 2026 Analysis Breakdown: Supported by a positive Insider Power Score of 33.61. Confidence increased due to high data reliability score of 100.

Historical Insider Trades

Date	Type	Person	Role	Amount
Feb 15, 2026 Sell	Common Stock F-InKind	Namdar Frank EVP Chief Credit Officer	Officer	1 169 Value: $36.8K
Feb 15, 2026 Sell	Common Stock F-InKind	Moore Devine David EVP Chief Marketing Officer	Officer	485 Value: $15.3K
Feb 15, 2026 Sell	Common Stock F-InKind	Merrywell Christopher Senior Executive Vp	Officer	1 706 Value: $53.7K
Feb 15, 2026 Sell	Common Stock F-InKind	Deer Aaron James EVP Chief Strategy/innov Offcr	Officer	531 Value: $16.7K
Feb 15, 2026 Sell	Common Stock F-InKind	Baruffi Kumi Yamamoto EVP General Counsel, Corp Sec	Officer	1 036 Value: $32.6K
Feb 15, 2026 Sell	Common Stock F-InKind	Anderson Drew K EVP Chief Admin Officer	Officer	788 Value: $24.8K
Feb 04, 2026 Buy	Deferred Compensation Phantom Stock A-Award	Machuca Luis Director	Director	562 Value: $17.5K
Feb 02, 2026 Sell	Common Stock F-InKind	Baruffi Kumi Yamamoto EVP General Counsel, Corp Sec	Officer	2 110 Value: $62.6K
Feb 02, 2026 Buy	Common Stock A-Award	Baruffi Kumi Yamamoto EVP General Counsel, Corp Sec	Officer	5 093 Value: $151.2K
Feb 02, 2026 Sell	Common Stock F-InKind	Deer Aaron James EVP Chief Strategy/innov Offcr	Officer	1 191 Value: $35.4K
Feb 02, 2026 Buy	Common Stock A-Award	Deer Aaron James EVP Chief Strategy/innov Offcr	Officer	2 620 Value: $77.8K
Feb 02, 2026 Sell	Common Stock F-InKind	Merrywell Christopher Senior Executive Vp	Officer	4 949 Value: $146.9K
Feb 02, 2026 Buy	Common Stock A-Award	Merrywell Christopher Senior Executive Vp	Officer	12 576 Value: $373.4K
Feb 02, 2026 Sell	Common Stock F-InKind	Moore Devine David EVP Chief Marketing Officer	Officer	965 Value: $28.7K
Feb 02, 2026 Buy	Common Stock A-Award	Moore Devine David EVP Chief Marketing Officer	Officer	2 095 Value: $62.2K
Feb 02, 2026 Sell	Common Stock F-InKind	Namdar Frank EVP Chief Credit Officer	Officer	2 383 Value: $70.8K
Feb 02, 2026 Buy	Common Stock A-Award	Namdar Frank EVP Chief Credit Officer	Officer	4 667 Value: $138.6K
Feb 02, 2026 Sell	Common Stock F-InKind	Nixon Torran B Senior Executive Vp	Officer	5 528 Value: $164.1K
Feb 02, 2026 Buy	Common Stock A-Award	Stein Clint Chair, President, CEO	CEO / President	21 988 Value: $652.8K
Feb 02, 2026 Sell	Common Stock F-InKind	Stein Clint Chair, President, CEO	CEO / President	8 653 Value: $256.9K
Feb 02, 2026 Buy	Common Stock A-Award	Stein Clint Chair, President, CEO	CEO / President	28 927 Value: $858.8K
Feb 02, 2026 Sell	Common Stock F-InKind	Stein Clint Chair, President, CEO	CEO / President	11 383 Value: $338.0K
Feb 02, 2026 Buy	Common Stock A-Award	Ognall Andrew H EVP Chief Risk Officer	Officer	4 510 Value: $133.9K
Feb 02, 2026 Sell	Common Stock F-InKind	Ognall Andrew H EVP Chief Risk Officer	Officer	1 929 Value: $57.3K
Dec 03, 2025 Buy	Deferred Compensation Phantom Stock A-Award	Machuca Luis Director	Director	65 Value: $2K

About Insider Power

Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.

It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%^* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.

While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.

* October 6th, 2025 - Tested on 5562 stocks

ABOUT COLUMBIA BANKING SYSTEM

Columbia Banking System, Inc. operates as the bank holding company for Columbia State Bank that provides a range of banking services to small and medium-sized businesses, professionals, and individuals in the United States. It offers personal banking products and services, including noninterest and interest-bearing checking, savings, money market, and certificate of deposit accounts; home mortgages for purchases and refinances, home equity loans ...

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