[8-K] COLUMBIA BANKING SYSTEM, INC. Reports Material Event

Rhea-AI Filing Summary

Columbia Banking System (COLB) announced a quarterly cash dividend of $0.37 per common share, representing a 3% increase from its most recent dividend. The dividend is payable December 15, 2025 to shareholders of record as of November 28, 2025.

The update, disclosed under an Other Events report, reflects the company’s ongoing cash returns to shareholders through regular dividends. A related press release was filed as Exhibit 99.1.

Insights

Banking Dividend Policy Analyst

Board raised the quarterly dividend to $0.37 per share, a modest 3% increase, with set record and payment dates.

The Board approved a quarterly cash dividend of $0.37 per common share, up 3% from the prior declaration. The dividend is payable on December 15, 2025 to holders of record on November 28, 2025. This action increases scheduled cash distributions relative to the most recent quarter.

For a bank holding company, dividend changes affect retained capital and cash outflows. A higher quarterly rate commits incremental cash each quarter until changed by a future Board action. The filing does not include other terms or conditions beyond amount, timing, and the attachment of a press release as Exhibit 99.1.

Key items to watch: confirmation of the dividend’s payment on December 15, 2025, any subsequent Board actions on the rate, and disclosures in future filings that could contextualize the sustainability of the $0.37 level. The record date of November 28, 2025 sets eligibility for this payment.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities and Exchange Act of 1934

Date of Report: November 14, 2025

(Date of earliest event reported)

Columbia Banking System, Inc.

(Exact Name of Registrant as Specified in Its Charter)

Washington			000-20288			91-1422237
(State or Other Jurisdiction of Incorporation or Organization)			(Commission File Number)			(I.R.S. Employer Identification Number)

1301 A Street

Tacoma, Washington 98402-4200

(address of Principal Executive Offices) (Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

[ ☐ ]    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[ ☐ ]    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[ ☐ ]    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[ ☐ ]    Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

TITLE OF EACH CLASS			TRADING SYMBOL			NAME OF EXCHANGE
Common Stock, No Par Value			COLB			The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company [ ☐ ]

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. [ ]

Item 8.01 Other Events.

On November 14, 2025, Columbia Banking System, Inc., parent company of Columbia Bank, announced its Board of Directors has approved a quarterly cash dividend in the amount of $0.37 per common share, representing a 3% increase to the most recent Columbia dividend declaration. The dividend is payable December 15, 2025, to shareholders of record as of November 28, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference in its entirety.

Item 9.01			Financial Statements and Exhibits
(d)			Exhibits.
			99.1 Press Release Announcing Quarterly Cash Dividend
			104 Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

			COLUMBIA BANKING SYSTEM, INC. (Registrant)
Dated: November 14, 2025			By: /s/ Kumi Yamamoto Baruffi      Kumi Yamamoto Baruffi      Executive Vice President, General Counsel

FAQ

What dividend did COLB declare?

Columbia Banking System approved a $0.37 per common share quarterly cash dividend.

How much is the increase in COLB’s dividend?

The dividend represents a 3% increase from the most recent declaration.

When is the COLB dividend payable?

The dividend is payable on December 15, 2025.

What is the record date for COLB’s dividend?

Shareholders of record on November 28, 2025 will be eligible.

Which filing announced COLB’s dividend?

The dividend was disclosed in an 8-K under Item 8.01 (Other Events).

Which security is affected by the dividend?

The dividend applies to common stock (ticker: COLB).