COLUMBIA BANKING SYSTEM, INC.

For the period ended Mar 31, 2026. Filed May 5, 2026.

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.

Mar 31, 2026 · Filed May 5, 2026

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

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Contents

Item 6. Exhibits

Exhibit #	Description	Location
3.1	Restated Articles of Incorporation	Incorporated by reference to Exhibit 3.1 of the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2023
3.2	Amended and Restated Bylaws	Incorporated by reference to Exhibit 3.2 of the Company's Annual Report on Form 10-K for the year ended December 31, 2025
4.1	Specimen Common Stock Certificate	Incorporated by reference to Exhibit 4.3 of the Company's Registration Statement on Form S-3 filed on December 19, 2008
4.2	Pursuant to Item 601(b) (4) (iii) (A) of Regulation S-K, copies of instruments defining the rights of holders of long-term debt and preferred securities are not filed. The Company agrees to furnish a copy thereof to the Securities and Exchange Commission upon request.
31.1	Certification of Chief Executive Officer under Section 302 of the Sarbanes-Oxley Act of 2002	Filed herewith
31.2	Certification of Chief Financial Officer under Section 302 of the Sarbanes-Oxley Act of 2002	Filed herewith
31.3	Certification of Principal Accounting Officer under Section 302 of the Sarbanes-Oxley Act of 2002	Filed herewith
32	Certification of Chief Executive Officer, Chief Financial Officer and Principal Accounting Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002	Filed herewith
101.INS	Inline XBRL Instance Document – The instance document does not appear in the interactive data file because its XBRL tags are embedded within the Inline XBRL document
101.SCH	Inline XBRL Taxonomy Extension Schema Document
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104	The cover page from the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, formatted in Inline XBRL (included in Exhibit 101)

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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.