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COLUMBIA BANKING SYSTEM, INC.

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

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About this filing

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 4. Controls and Procedures

Our management, including our Chief Executive Officer, Chief Financial Officer and Principal Accounting Officer, has concluded that our disclosure controls and procedures are effective in timely alerting them to information relating to us that is required to be included in our periodic filings with the SEC. The disclosure controls and procedures were last evaluated by management as of September 30, 2025.

No change in internal control over financial reporting occurred during the quarter ended September 30, 2025 that has materially affected, or is reasonably likely to materially affect, our internal controls over financial reporting.

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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.