4processed

Form 4 — Insider Transaction

COLUMBIA BANKING SYSTEM, INC.(COLB)

Filing Date

May 14, 2026

Accepted

May 14, 2026

Accession No.

0001481735-26-000003

CIK

0000887343

Insider Transactions

InsiderTitleTypeSharesPriceValueOwned AfterSecurityDate
Terry Hilliard C. IIIOther3.9K$055.5KCommon StockMay 14, 2026