4processed

Form 4 — Insider Transaction

COLUMBIA BANKING SYSTEM, INC.(COLB)

Filing Date

June 8, 2026

Accepted

June 8, 2026

Accession No.

0001798077-26-000005

CIK

0000887343

Insider Transactions

InsiderTitleTypeSharesPriceValueOwned AfterSecurityDate
Moore Devine DavidEVP Chief Marketing OfficerOther60$29.7722.4KCommon StockJun 8, 2026
Moore Devine DavidEVP Chief Marketing OfficerOther3.8K$29.77518.6KCommon StockJun 8, 2026