Columbia Banking System, Inc. Retirement Agreements

Second Amendment to the Columbia State Bank Supplemental Executive Retirement Plan Agreement, dated as of February 28, 2023, by and between Columbia State Bank and Kumi Baruffi (Filed With SEC on May 9, 2023)

Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Lisa Dow, effective March 11, 2018 (Filed With SEC on May 3, 2019)

Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Gregory A. Sigrist, effective July 25, 2018 (Filed With SEC on November 7, 2018)

First Amendment to the First Amended and Restated Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Clinton E. Stein, effective... (Filed With SEC on March 1, 2018)

First Amendment to the Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Hadley S. Robbins, effective November 15, 2017 (Filed With SEC on March 1, 2018)

First Amendment to the First Amended and Restated Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Andrew L. McDonald, effective... (Filed With SEC on March 1, 2018)

First Amendment to the First Amended and Restated Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and David Lawson, effective... (Filed With SEC on March 1, 2018)

First Amendment to the Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Kumi Baruffi, effective November 15, 2017 (Filed With SEC on March 1, 2018)

COLUMBIA STATE BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN AGREEMENT (By and Between Columbia State Bank and Kumi Baruffi) ARTICLE I PURPOSE AND EFFECTIVE DATE (Filed With SEC on May 6, 2015)

COLUMBIA STATE BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN AGREEMENT (By and Between Columbia State Bank and Hadley S. Robbins) ARTICLE I PURPOSE AND EFFECTIVE DATE (Filed With SEC on May 6, 2015)

FIRST AMENDMENT TO THE RESTATED AND AMENDED WEST COAST BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN AGREEMENT (Acquired by Columbia State Banking System, Inc.) (Filed With SEC on May 6, 2015)

FIRST AMENDED AND RESTATED COLUMBIA STATE BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN AGREEMENT (By and Between Columbia State Bank and David Lawson) ARTICLE I PURPOSE AND... (Filed With SEC on May 6, 2015)

FIRST AMENDED AND RESTATED COLUMBIA STATE BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN AGREEMENT (By and Between Columbia State Bank and Andrew L. McDonald) ARTICLE I PURPOSE AND... (Filed With SEC on May 6, 2015)

FIRST AMENDED AND RESTATED COLUMBIA STATE BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN AGREEMENT (By and Between Columbia State Bank and Clinton E. Stein) ARTICLE I PURPOSE AND... (Filed With SEC on May 6, 2015)

FIRST AMENDMENT TO THE SECOND AMENDED AND RESTATED COLUMBIA STATE BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN AGREEMENT (By and Between Melanie J. Dressel & Columbia State Bank) (Filed With SEC on May 6, 2015)

COLUMBIA STATE BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN AGREEMENT ARTICLE I PURPOSE AND EFFECTIVE DATE (Filed With SEC on May 9, 2014)

COLUMBIA STATE BANK SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN AGREEMENT ARTICLE I PURPOSE AND EFFECTIVE DATE (Filed With SEC on November 4, 2013)

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Columbia Banking System, Inc. Retirement Agreements