<SEC-DOCUMENT>0001193125-21-346812-index.html : 20211202 <SEC-HEADER>0001193125-21-346812.hdr.sgml : 20211202 <ACCEPTANCE-DATETIME>20211202171252 ACCESSION NUMBER: 0001193125-21-346812 CONFORMED SUBMISSION TYPE: S-4/A PUBLIC DOCUMENT COUNT: 17 FILED AS OF DATE: 20211202 DATE AS OF CHANGE: 20211202 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: S-4/A SEC ACT: 1933 Act SEC FILE NUMBER: 333-261281 FILM NUMBER: 211467713 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>S-4/A <SEQUENCE>1 <FILENAME>d261205ds4a.htm <DESCRIPTION>S-4/A <TEXT> Document 1 - file: d261205ds4a.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-5.1 <SEQUENCE>2 <FILENAME>d261205dex51.htm <DESCRIPTION>EX-5.1 <TEXT> Document 2 - file: d261205dex51.htm
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</DOCUMENT> <DOCUMENT> <TYPE>EX-99.1 <SEQUENCE>5 <FILENAME>d261205dex991.htm <DESCRIPTION>EX-99.1 <TEXT> Document 5 - file: d261205dex991.htm
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