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Columbia Banking System And Umpqua Holdings Corporation Combining To Create The West Coast's Leading Regional Bank

TACOMA, Wash. and PORTLAND, Ore., Oct. 12, 2021 /PRNewswire/ -- Columbia Banking System, Inc. ("Columbia") (NASDAQ:COLB), the parent company of Columbia State Bank, and Umpqua Holdings Corporation ("Umpqua") (NASDAQ:UMPQ), the parent company of Umpqua