<SEC-DOCUMENT>0000887343-20-000131-index.html : 20200417 <SEC-HEADER>0000887343-20-000131.hdr.sgml : 20200417 <ACCEPTANCE-DATETIME>20200417151150 ACCESSION NUMBER: 0000887343-20-000131 CONFORMED SUBMISSION TYPE: DEFA14A PUBLIC DOCUMENT COUNT: 5 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: DEFA14A SEC ACT: 1934 Act SEC FILE NUMBER: 000-20288 FILM NUMBER: 20799232 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>DEFA14A <SEQUENCE>1 <FILENAME>defa14a2019proxy.htm <DESCRIPTION>DEFA14A <TEXT> Document 1 - file: defa14a2019proxy.htm
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>2 <FILENAME>proxyntcpage3a001.jpg <TEXT> Document 2 - file: proxyntcpage3a001.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>3 <FILENAME>proxyntcpage0a01.jpg <TEXT> Document 3 - file: proxyntcpage0a01.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>4 <FILENAME>proxyntcpage1a01.jpg <TEXT> Document 4 - file: proxyntcpage1a01.jpg
</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>5 <FILENAME>proxyntcpage2a01.jpg <TEXT> Document 5 - file: proxyntcpage2a01.jpg
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