X0306 4 2023-02-28 1 0001077771 UMPQUA HOLDINGS CORP UMPQ 0001798734 White Lisa M 5885 MEADOWS ROAD, SUITE 400 LAKE OSWEGO OR 97035 1 SVP/Principal Accting Officer Common Stock 2023-02-28 4 F 0 749 17.66 D 37851 D Common Stock 2023-02-28 4 D 0 37851 0 D 0 D Payment of a portion of the tax liability by delivering or withholding securities incident to the receipt or vesting of a security issued in accordance with Rule 16b-3. Disposed of with the Issuer's merger with Columbia Banking System. Each share of Issuer stock converted into a right to receive 0.5958 of a share of Columbia stock, with a market value of $17.71 per share of Issuer stock based on the closing price of Columbia stock on the last trading day prior to the merger of $29.73 per share. Each Issuer restricted and performance stock unit award was disposed of in exchange for restricted stock unit awards in respect of Columbia stock equal to the product of the number of shares of Issuer stock subject to the award multiplied by 0.5958. Each Columbia award will be subject to the terms and conditions (excluding performance-based vesting) of the converted Issuer award prior to the merger. The number of shares subject to the performance award was determined based on performance levels deemed satisfied as set forth in the merger agreement. As a result of the merger the reporting person no longer beneficially owns any shares of Issuer stock. /s/ Andrew H. Ognall, Attorney-in-Fact for Lisa M. White 2023-03-01