Insider Trading & Ownership of Columbia Banking System, Inc.

Location: Tacoma, WA
Summary: The estimated value of insider holdings of Columbia Banking System, Inc. is at least $278K dollars as of 01 Dec 2025. Columbia Banking System, Inc. is the EVP, Chief Accounting Officer of COLUMBIA BANKING SYSTEM, INC. and owns shares of COLUMBIA BANKING SYSTEM, INC. (COLB) stock worth about $278K.
Signature: /s/ Andrea M. Newburn, Attorney-in-fact
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Ownership of Columbia Banking System, Inc.

Symbol	Company	Relationship	Holdings Value	Past Year Net Change	Change %	Report Period
COLB	COLUMBIA BANKING SYSTEM, INC.	EVP, Chief Accounting Officer	$278K			20 Nov 2025