$COLB 8-K/A SEC Filings

Filed On	Filing
03 Sep 2025	8-K/A: Financial Statements and Exhibits The following unaudited pro forma condensed combined financial information and the accompanying notes (the “pro forma financial information”) are presented to illustrate the effects of the accounting for the mergers.
03 Mar 2023	8-K/A: Financial Statements and Exhibits The following unaudited pro forma condensed combined financial information combines the historical consolidated financial position and results of operations of Columbia Banking System, Inc. (“Columbia”) and Umpqua Holdings Corporation (“...
18 Dec 2017	8-K/A: Completion of Acquisition or Disposition of Assets
24 Oct 2014	8-K/A: Departure/Election of Directors or Officers; Compensation
30 Jun 2014	8-K/A: Departure/Election of Directors or Officers; Compensation
14 Jun 2013	8-K/A: Completion of Acquisition or Disposition of Assets
05 Aug 2011	8-K/A: Completion of Acquisition or Disposition of Assets
05 Aug 2011	8-K/A: Completion of Acquisition or Disposition of Assets
09 Apr 2010	8-K/A: Completion of Acquisition or Disposition of Assets
31 Aug 2009	8-K/A: Results of Operations and Financial Condition
10 Aug 2005	8-K/A: Results of Operations and Financial Condition; Other Events
17 Mar 1997	8-K/A: Completion of Acquisition or Disposition of Assets

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