<SEC-DOCUMENT>0000887343-25-000245-index.html : 20250903
<SEC-HEADER>0000887343-25-000245.hdr.sgml : 20250903
<ACCEPTANCE-DATETIME>20250903194612
ACCESSION NUMBER:		0000887343-25-000245
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20250831
FILED AS OF DATE:		20250903
DATE AS OF CHANGE:		20250903

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MITCHELL M CHRISTIAN
		CENTRAL INDEX KEY:			0001284574
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20288
		FILM NUMBER:		251291547

	MAIL ADDRESS:	
		STREET 1:		355 S. GRAND AVE
		STREET 2:		SUITE 1750
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90071

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COLUMBIA BANKING SYSTEM, INC.
		CENTRAL INDEX KEY:			0000887343
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		ORGANIZATION NAME:           	02 Finance
		EIN:				911422237
		STATE OF INCORPORATION:			WA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1301 A STREET
		CITY:			TACOMA
		STATE:			WA
		ZIP:			98402
		BUSINESS PHONE:		2533051900

	MAIL ADDRESS:	
		STREET 1:		1301 A STREET
		CITY:			TACOMA
		STATE:			WA
		ZIP:			98402

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COLUMBIA BANKING SYSTEM INC
		DATE OF NAME CHANGE:	19930328
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>wk-form3_1756943169.xml
<DESCRIPTION>FORM 3
<TEXT>
Document 1 - file: wk-form3_1756943169.html

Document 1 - RAW XML: wk-form3_1756943169.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>a2025-08x14powerofattorn.htm
<DESCRIPTION>EX-24
<TEXT>
Document 2 - file: a2025-08x14powerofattorn.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>a2025-08x14powerofattorn001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: a2025-08x14powerofattorn001.jpg

</DOCUMENT>
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