Columbia Banking System, Inc. | Change of Control Agreements | Business Contracts

Change in Control Agreement between the Bank and Lisa Dow dated as of November 25, 2020 (Filed With SEC on February 26, 2021)

Change in Control Agreement between the Bank and David Lawson dated as of November 25, 2020 (Filed With SEC on February 26, 2021)

Change in Control Agreement between the Bank and Aaron Deer dated as of May 7, 2020 (Filed With SEC on July 31, 2020)

Change in Control Agreement between the Bank and Kumi Yamamoto Baruffi dated as of December 2, 2019 (Filed With SEC on February 27, 2020)

Change in Control Agreement between the Bank and Andrew L. McDonald dated as of May 23, 2019 (Filed With SEC on August 1, 2019)

Change in Control Agreement between the Bank and Clint E. Stein dated as of October 24, 2017 (Filed With SEC on May 3, 2019)

Change in Control Agreement between the Bank and David C. Lawson, dated December 11, 2018 (Filed With SEC on February 28, 2019)

Columbia Banking System, Inc. (50) | Change of Control Agreements (7)