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COLUMBIA BANKING SYSTEM, INC.

For the period ended Sep 30, 2026. Filed Nov 5, 2026.

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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, 2026 · Filed Nov 5, 2026

COLB$30.85-0.5%Stored close · as of Nov 10, 2026

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Unregistered Sales of Equity Securities and Use of Proceeds

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

(a)Not applicable

(b)Not applicable

(c)The following table provides information regarding repurchases of the Company's common stock during the quarter ended September 30, 2026:

PeriodTotal number of Common Shares Purchased (in thousands) (1)Average Price Paid per Common ShareTotal Number of Shares Purchased as Part of Publicly Announced Plan (in thousands) (2)Maximum Dollar Value of Shares that May be Purchased at Period End under the Plan (in millions) (2)
07/01/26 - 07/31/266$31.60—$202
08/01/26 - 08/31/263,333$31.293,325$98
09/01/26 - 09/30/263,216$29.983,168$3
Total for quarter6,555$30.656,493

(1)Common shares repurchased by the Company during the three months ended September 30, 2026 included the cancellation of 61,626 shares that otherwise would have been issued upon vesting of restricted stock units and awards to satisfy withholding tax obligations.

(2)On October 29, 2025, Columbia's Board of Directors authorized a share repurchase program for up to $700 million of the Company's common stock. During the three months ended September 30, 2026, the Company repurchased 6.5 million shares for an aggregate purchase price of $199 million under this program. As of September 30, 2026, $3 million remained available for future share repurchases under this program. As of October 20, 2026, the Company approved a new share repurchase program, which authorizes the Company to repurchase up to $1.2 billion of common stock, with no expiration date. The Company does not intend to make additional share repurchases under the previous program, and future share repurchases, if any, will be made under the new program. The timing and amount of future repurchases will depend upon a number of factors, including the market price for the Company's common stock, applicable laws and regulations, asset growth, earnings, the Company's capital plan, and required bank and bank holding company regulatory approvals.

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