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COLUMBIA BANKING SYSTEM INC

For the period ended Mar 31, 2024. Filed May 7, 2024.

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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.

Mar 31, 2024 · Filed May 7, 2024

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 first quarter of 2024 none of our directors or officers adopted or terminated 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, 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 employee stock purchase plan, 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.