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
Mar 13, 2026 Buy	Restricted Stock Unit M-Exempt	Deer Aaron James EVP Chief Strategy/innov Offcr	Officer	1 567 Value: $41.1K
Mar 13, 2026 Buy	Common Stock M-Exempt	Merrywell Christopher Senior Executive Vp	Officer	5 013 Value: $131.5K
Mar 13, 2026 Sell	Common Stock F-InKind	Merrywell Christopher Senior Executive Vp	Officer	1 973 Value: $51.8K
Mar 13, 2026 Buy	Common Stock M-Exempt	Lakely Brock EVP, Chief Accounting Officer	Officer	846 Value: $22.2K
Mar 13, 2026 Sell	Common Stock S-Sale	Lakely Brock EVP, Chief Accounting Officer	Officer	211 Value: $6K
Mar 13, 2026 Buy	Restricted Stock Unit M-Exempt	Lakely Brock EVP, Chief Accounting Officer	Officer	846 Value: $22.2K
Mar 13, 2026 Buy	Common Stock M-Exempt	Deer Aaron James EVP Chief Strategy/innov Offcr	Officer	1 567 Value: $41.1K
Mar 13, 2026 Buy	Restricted Stock Unit M-Exempt	Merrywell Christopher Senior Executive Vp	Officer	5 013 Value: $131.5K
Mar 13, 2026 Sell	Common Stock F-InKind	Anderson Drew K EVP Chief Admin Officer	Officer	1 215 Value: $31.9K
Mar 13, 2026 Buy	Restricted Stock Unit M-Exempt	Anderson Drew K EVP Chief Admin Officer	Officer	2 506 Value: $65.7K
Mar 13, 2026 Buy	Restricted Stock Unit M-Exempt	Baruffi Kumi Yamamoto EVP General Counsel, Corp Sec	Officer	2 381 Value: $62.5K
Mar 13, 2026 Sell	Common Stock S-Sale	Baruffi Kumi Yamamoto EVP General Counsel, Corp Sec	Officer	937 Value: $24.6K
Mar 13, 2026 Buy	Common Stock M-Exempt	Baruffi Kumi Yamamoto EVP General Counsel, Corp Sec	Officer	2 381 Value: $62.5K
Mar 13, 2026 Buy	Restricted Stock Unit M-Exempt	Ognall Andrew H EVP Chief Risk Officer	Officer	2 381 Value: $62.5K
Mar 13, 2026 Buy	Common Stock M-Exempt	Nixon Torran B Senior Executive Vp	Officer	5 013 Value: $131.5K
Mar 13, 2026 Sell	Common Stock F-InKind	Nixon Torran B Senior Executive Vp	Officer	2 002 Value: $52.5K
Mar 13, 2026 Buy	Restricted Stock Unit M-Exempt	Nixon Torran B Senior Executive Vp	Officer	5 013 Value: $131.5K
Mar 13, 2026 Buy	Common Stock M-Exempt	Namdar Frank EVP Chief Credit Officer	Officer	2 820 Value: $74.0K
Mar 13, 2026 Sell	Common Stock F-InKind	Namdar Frank EVP Chief Credit Officer	Officer	1 367 Value: $35.9K
Mar 13, 2026 Buy	Restricted Stock Unit M-Exempt	Namdar Frank EVP Chief Credit Officer	Officer	2 820 Value: $74.0K
Mar 13, 2026 Buy	Common Stock M-Exempt	Moore Devine David EVP Chief Marketing Officer	Officer	940 Value: $24.7K
Mar 13, 2026 Sell	Common Stock F-InKind	Moore Devine David EVP Chief Marketing Officer	Officer	376 Value: $10K
Mar 13, 2026 Buy	Restricted Stock Unit M-Exempt	Moore Devine David EVP Chief Marketing Officer	Officer	940 Value: $24.7K
Mar 04, 2026 Sell	Common Stock S-Sale	Nixon Torran B Senior Executive Vp	Officer	2 240 Value: $64.6K
Mar 03, 2026 Sell	Common Stock S-Sale	Nixon Torran B Senior Executive Vp	Officer	2 241 Value: $63.3K

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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