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COLUMBIA BANKING SYSTEM, INC.

For the period ended Sep 30, 2025. Filed Nov 6, 2025.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 30, 2025 · Filed Nov 6, 2025

COLB$31.00+1.7%Stored close · as of Nov 9, 2026

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Item 5. Other Information

Rule 10b5-1 or Non-Rule 10b5-1 Trading Arrangements

During the third quarter of 2025 none of our directors or officers adopted orterminated a trading plan intended to satisfy Rule 10b5-1 or any "non-Rule 10b5-1 trading arrangement," as defined in Item 408 of Regulation S-K.

Certain of our officers and directors have made elections to participate in, and are participating in, our 401(k) and profit sharing plan and have made, and may from time to time make, elections to (i) have shares withheld to cover withholding taxes or (ii) have dividends from Columbia common stock reinvested into Columbia common stock, (iii) have a portion of their 401(k) account contributions used to purchase Columbia common stock, or (iv) participate in the ESPP, which may be intended to satisfy the affirmative defense conditions of Rule 10b5-1 under the Exchange Act or may constitute non-Rule 10b5-1 trading arrangements (as defined in Item 408(c) of Regulation S-K).

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.