Columbia Banking System, INC. 8-K Filing

Ticker: COLB · Form: 8-K · Filed: Nov 4, 2025 · CIK: 887343

Sentiment: neutral

Filing Stats: 1,276 words · 5 min read · ~4 pages · Grade level 11.7 · Accepted 2025-11-04 16:02:52

Key Financial Figures

Filing Documents

Financial Statements and Exhibits

Financial Statements and Exhibits. (d) EXHIBITS 10.1 Transition Letter, dated as of October 31, 2025, between Columbia Banking System, Inc., Columbia Bank and Ronald L. Farnsworth 99.1 Press Release of the Company, dated October 30, 2025, regarding Mr. Seda's appointment as CFO 104 Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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 4, 2025 By: /s/ Kumi Yamamoto Baruffi Kumi Yamamoto Baruffi EVP, General Counsel

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