X0306 4 2023-02-28 1 0001077771 UMPQUA HOLDINGS CORP UMPQ 0001239047 POPE MARIA M 5885 MEADOWS ROAD, SUITE 400 LAKE OSWEGO OR 97035 1 Common Stock 2023-02-28 4 D 0 62803 0 D 0 D Disposed of in connection with the Issuer's merger with Columbia Banking System, Inc. and each share of common stock of Issuer converted into the right to receive 0.5958 of a share of common stock of Columbia, having a market value of $17.71 per share of Issuer Common Stock based on the closing price per share of Columbia Common Stock on the last trading day prior to the merger of $29.73 per share. As a result of the Merger, the reporting person no longer beneficially owns, directly or indirectly, any shares of Issuer Common Stock. /s/ Andrew H. Ognall, Attorney-in-Fact for Maria M. Pope 2023-03-01