<SEC-DOCUMENT>0000887343-20-000130-index.html : 20200417
<SEC-HEADER>0000887343-20-000130.hdr.sgml : 20200417
<ACCEPTANCE-DATETIME>20200417150928
ACCESSION NUMBER:		0000887343-20-000130
CONFORMED SUBMISSION TYPE:	DEF 14A
PUBLIC DOCUMENT COUNT:		22
CONFORMED PERIOD OF REPORT:	20191231
FILED AS OF DATE:		20200417
DATE AS OF CHANGE:		20200417
EFFECTIVENESS DATE:		20200417

FILER:

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

	FILING VALUES:
		FORM TYPE:		DEF 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-20288
		FILM NUMBER:		20799224

	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>DEF 14A
<SEQUENCE>1
<FILENAME>columbiabankproxy2020.htm
<DESCRIPTION>DEF 14A
<TEXT>
Document 1 - file: columbiabankproxy2020.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>byinternet.jpg
<TEXT>
Document 2 - file: byinternet.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>bymail.jpg
<TEXT>
Document 3 - file: bymail.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>byphone.jpg
<TEXT>
Document 4 - file: byphone.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>cbbug1cpms2935cutout8004x783.jpg
<TEXT>
Document 5 - file: cbbug1cpms2935cutout8004x783.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>clintestein1x1photo.jpg
<TEXT>
Document 6 - file: clintestein1x1photo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>craigdeerkes1x1photo.jpg
<TEXT>
Document 7 - file: craigdeerkes1x1photo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>craigeerkesa01.jpg
<TEXT>
Document 8 - file: craigeerkesa01.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>elizabethseaton1x1photo.jpg
<TEXT>
Document 9 - file: elizabethseaton1x1photo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>ericforrest1x1photoa01.jpg
<TEXT>
Document 10 - file: ericforrest1x1photoa01.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>fordelsaesser1x1photoa01.jpg
<TEXT>
Document 11 - file: fordelsaesser1x1photoa01.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>incentiveawardvestsched02.jpg
<TEXT>
Document 12 - file: incentiveawardvestsched02.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>13
<FILENAME>janineterrano1x1photo.jpg
<TEXT>
Document 13 - file: janineterrano1x1photo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>14
<FILENAME>kumia01.jpg
<TEXT>
Document 14 - file: kumia01.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>15
<FILENAME>maenumata1x1photo.jpg
<TEXT>
Document 15 - file: maenumata1x1photo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>16
<FILENAME>markafinkelstein1x1photo.jpg
<TEXT>
Document 16 - file: markafinkelstein1x1photo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>17
<FILENAME>michellemlantow1x1photo.jpg
<TEXT>
Document 17 - file: michellemlantow1x1photo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>18
<FILENAME>proxycardpage1.jpg
<TEXT>
Document 18 - file: proxycardpage1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>19
<FILENAME>proxycardpage2.jpg
<TEXT>
Document 19 - file: proxycardpage2.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>20
<FILENAME>randylund1x1photo.jpg
<TEXT>
Document 20 - file: randylund1x1photo.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>21
<FILENAME>steinsig.jpg
<TEXT>
Document 21 - file: steinsig.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>22
<FILENAME>thomasmhulbert1x1photo.jpg
<TEXT>
Document 22 - file: thomasmhulbert1x1photo.jpg

</DOCUMENT>
</SEC-DOCUMENT>