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Mr. Stein has served as Chair of the Board, Chief Executive Officer and President of Columbia and as Chair of the Board and Chief Executive Officer of Columbia Bank since January 2026. He served as President, Chief Executive Officer and Director of Columbia since 2020, overseeing operations across the United States. He served as Chief Executive Officer and Director of Columbia Bank since 2023, following the formal separation of the President and Chief Executive Officer roles at Columbia Bank. Prior to that, he served as President, Chief Executive Officer and Director of Columbia State Bank from 2020 to 2023. Since joining Columbia in 2005, Mr. Stein has held several senior executive positions including Senior Vice President, Chief Accounting Officer and Controller (2005-2012), Executive Vice President, Chief Financial Officer (2012-2018), and Executive Vice President, Chief Operating Officer (2017-2019). Prior to joining Columbia, Mr. Stein served as Chief Financial Officer for Albina Community Bank, which he joined following his tenure as Chief Financial Officer at Community Bank. Mr. Stein began his career in the financial services industry as a certified public accountant focused on tax and municipal and nonprofit auditing. Mr. Stein was recognized as CFO of the Year by the Puget Sound Business Journal (PSBJ) in 2015, has been named to the PSBJ's Power 100 list for four consecutive years (2022-2025), and was a 2025 PSBJ Most Admired CEOs honoree. In addition, Mr. Stein was recognized as Business Leader of the Year in 2024 by the University of Washington's Milgard School of Business.He currently serves on the board of the Federal Reserve Bank of San Francisco. His previous board service includes the Washington Bankers Association, Pacific Coast Banking School, and the Executive Council for a Greater Tacoma and the Tacoma-Pierce County Chamber of Commerce. Education: Bachelor's Degree in Accounting and Business Administration, University of Idaho; Graduate School of Bank Financial Management and the Graduate School of Banking, University of Wisconsin; previously a licensed certified public accountant in the State of Oregon.

Mr. Nixon has served as Senior Executive Vice President of Columbia and as President of Commercial Banking of Umpqua Bank since March 2023. He served Umpqua Bank as President from June 2020 to February 2023, as Senior Executive Vice President, Chief Banking Officer from April 2018 to May 2020, as Executive Vice President, Head of Commercial and Wealth from October 2016 to April 2018, and as Executive Vice President, Commercial Banking from November 2015 to October 2016.

Mr. Merrywell has served as Senior Executive Vice President of Columbia and President of Consumer Banking of Columbia Bank since March 2023. He served as Executive Vice President, Chief Operating Officer of Columbia and Columbia State Bank from January 2020 to February 2023. He served Columbia State Bank as Executive Vice President, Chief Consumer Banking Officer from February 2017 to December 2019, and as Senior Vice President, Director of Wealth Management from October 2012 to February 2017.

Mr. Ognall has served as Executive Vice President, Chief Human Resources Officer of Columbia since May 2024 and of Umpqua Bank since April 2024. He previously served as Integration Management Office General Counsel of Columbia and as Executive Vice President, Integration Management Office General Counsel of Umpqua Bank since March 2023. He served as Executive Vice President, General Counsel and Corporate Secretary of Umpqua and of Umpqua Bank from April 2014 to February 2023

Mr. Seda has served as Executive Vice President, Chief Financial Officer of Columbia and of Columbia Bank since December 2025. He joined Columbia and Columbia Bank as Executive Vice President, Deputy Chief Financial Officer in August 2025. Prior to Columbia, he served as Deputy Chief Financial Officer at BECU from April 2023 to July 2025, as Chief Financial Officer at Union Bank from June 2021 to March 2023, and as Head of Corporate Finance and Strategy-Americas at MUFG from August 2019 to June 2021.

Mr. Gardner served as Chairman, Chief Executive Officer and President of Pacific Premier and as Chairman and Chief Executive Officer of Pacific Premier Bank until their acquisition by Columbia in 2025. He has extensive knowledge of all facets of financial institution management. During his tenure, Mr. Gardner led Pacific Premier Bank's transformation into one of the largest commercial banks headquartered in California and a top performing bank in the United States, completing 12 acquisitions across whole banks, specialty finance lines of business and FDIC-assisted transactions. Mr. Gardner is an expert in all areas of mergers and acquisitions as well as capital market transactions. Prior to Pacific Premier, he was an executive officer of Hawthorne Financial Corporation, responsible for credit administration and portfolio management. Earlier in his career, he held senior management roles at both commercial banks and thrift institutions.In addition to his experience as an executive, Mr. Gardner previously served as a director for the Federal Reserve Bank of San Francisco and as a director and chairman of the finance committee for the Federal Home Loan Bank of San Francisco. He also previously served as vice chairman of the Federal Reserve Bank of San Francisco's Community Depository Institutions Advisory Council. Education: Bachelor's Degree, California State University, Fullerton; Graduate School, California State University, Long Beach

Mr. Lund served as a partner for over 35 years with the accounting firm KPMG, one of the Big Four accounting firms in the United States. His extensive background in public accounting includes leadership over complex audits, capital markets transactions, and the application of both United States generally accepted accounting principles (GAAP) and International Financial Reporting Standards (IFRS) across a range of industries, including financial services.During his tenure at KPMG, Mr. Lund advised numerous clients through initial public offerings, secondary equity and debt offerings, and mergers and acquisitions transactions. He has vast experience in revenue recognition, stock-based compensation, tax accounting, complex debt and equity transactions, and acquisition accounting, among others. As a designated SEC engagement quality control partner, Mr. Lund regularly worked with leading public companies, engaging directly with audit committees and SEC regulators to address emerging accounting issues, assess internal controls, and strengthen regulatory compliance and corporate governance practices.In addition to his technical knowledge, Mr. Lund served as a designated IFRS partner for international engagements and played a role in implementing audit methodologies at KPMG. His experience in evaluating financial reporting integrity and advising on regulatory compliance makes him a valuable asset to the Board. Mr. Lund is a NACD Board Leadership Fellow. Education: Bachelor's Degree in Accounting, Montana State University

Ms. Seaton is the former President and Chief Executive Officer of Saltchuk Aviation, an air cargo and aviation services company headquartered in Seattle, Washington. She successfully guided the company through numerous milestones during her six-year tenure, including achieving top-tier safety performance, expanding partnerships with key customers and overseeing significant operational growth. Under her leadership, Saltchuk successfully integrated Ryan Air into its portfolio.Ms. Seaton previously served as Senior Vice President of Operations for Saltchuk Resources, Inc., a family of diversified transportation and fuel distribution companies. Earlier in her career, she spent over 20 years at Weyerhaeuser, where she held senior roles in strategic planning, capital investments and business operations, which deepened her expertise in enterprise risk management, capital investments, operations and corporate governance. She began her career as a Principal at Boston Consulting Group, advising clients on strategic development, turnarounds and change management, and mergers and acquisitions.Ms. Seaton serves on the board of directors of Premera, a not-for-profit parent company that through its family of companies delivers comprehensive health benefits and personalized services to individuals, small businesses and Fortune 100 companies. She also serves on the Planned Parenthood Federation of America Board after serving on Planned Parenthood Great Northwest, Hawaii, Alaska, Indiana, Kentucky. Ms. Seaton has held several board leadership roles, including Board Chair and Vice Chair, Finance and Investment Committee Chair, Board Secretary, and Executive Committee member.Ms. Seaton was named a Director of the Year in 2024 by PSBJ and named as one of the Power 100 business and not-for-profit leaders in the Pacific Northwest. Education: Bachelor's Degree in Economics, History, Princeton University; J.D./Master of Business Administration, University of Chicago Business and Law Schools

Mr. Machuca served as President and Chief Executive Officer of Enli Health Intelligence Corporation, a healthcare software and applications company he co-founded, for 19 years until its sale to Cedar Gate Technologies in 2020. Under his leadership, the company was acquired by Surescripts as a wholly owned subsidiary in 2012 and spun out as an independent company in 2015, at which time it rapidly became the market leader in population health management software. Prior to Enli Health Intelligence, Mr. Machuca led the turnaround of the NEC Computer Services Division at Packard Bell-NEC Corporation and successfully repositioned eFusion for acquisition by ITXC in 2000, subsequently serving as Executive Vice President and General Manager of e-Commerce. He began his career with Intel, where he spent 15 years ascending to leadership roles in manufacturing, engineering, marketing, and ultimately became the General Manager of the OEM Systems Division. He previously served on the board of directors of Cambia Health Systems (2009-2024), a nonprofit health care company based in Portland, Oregon, and as the Chair of Umpqua's Compensation Committee until its merger with Columbia in 2023. Education: Bachelor's Degree in Electrical Engineering and Master of Science in Industrial Engineering, Purdue UniversityOther Public Board Directorships: GigCapital8 Corp. (Nasdaq: GIWWU; 2025-present); GigCapital9 Corp. (Nasdaq: GIXXU; 2026-present); UpHealth, Inc. (NYSE: UPH; 2022-present)

Most recently, Mr. Finkelstein served as Chief Legal and Administrative Officer and Secretary of Blucora, Inc. (former Nasdaq: BCOR), a provider of technology-enabled financial solutions, where he led the company's legal, compliance and human resources functions. He advised the board on a wide variety of legal and corporate strategy matters, corporate governance, shareholder engagement, disclosure obligations, risk management, and mergers and acquisitions transactions. Prior to Blucora, he served as General Counsel, Corporate Secretary, and Executive Vice President of Corporate Development at Emeritus Corp. (former NYSE: ESC), a senior living healthcare provider with more than 30,000 employees supporting operations in 45 states, where he oversaw the company's legal, compliance, and corporate development departments. Earlier in his career, he served as Chief Executive Officer and a board member of Novellus Capital Management, overseeing firm-wide strategic direction and operations, and he served as a strategic advisor for private investment firms in the United States and Europe. He is a National Association of Corporate Directors (NACD) Board Leadership Fellow. He has served on the board of directors of Christensen, Inc. since 2020, Education: Bachelor's Degree with High Honors in Economics, The University of Michigan; J.D., The University of Michigan Law School.

Ms. Varnado served as General Manager and Head of Consumer Businesses at Kohler Company, a global leader in home products, hospitality destinations and systems, where she oversaw key growth and transformation initiatives and led consumer channels and e-commerce sales. In this role, she developed expertise in customer-centric strategy, digital channel optimization, data-driven decision-making, and large-scale operational execution.Prior to Kohler, Ms. Varnado was Vice President of Strategy and Business Development at Macy's, where she oversaw strategic evaluation, including analysis, development, transformation and innovation in the consumer market. She also served as Vice President and Head of Strategy and Business Development at Williams-Sonoma, where she was directly responsible for mergers and acquisitions, new business, and brand development across the company's multi-brand portfolio. At Williams-Sonoma, Ms. Varnado led the acquisition of Outward, Inc., a digital imaging company, which was the largest acquisition transaction in the company's history at that time and positioned the business at the forefront of retail technology.Ms. Varnado's experience also includes management consulting at ZS Associates, product leadership at New York Life Insurance Company and corporate banking at Citigroup. Education: Bachelor's Degree in Business Administration, Clark Atlanta University; Master of Business Administration, Harvard Business School Other Public Board Directorships: Red Robin Gourmet Burgers, Inc. (Nasdaq: RRGB; 2021-present)

Mr. Mitchell currently serves as a Senior Advisor to and member of the board of directors of Marshall & Stevens, a national valuation and financial advisory firm. He previously served as a national managing partner for Deloitte's Mortgage Banking and Finance Companies practice. During his 26-year career at Deloitte, he also served as regional managing partner for various practices including audit, enterprise risk services and financial services.He was a founding member of the board of directors of Deloitte Consulting USA, which worked with Fortune 500 companies to solve complex business challenges through strategy development and implementation, human capital and digital transformation to maintain competitiveness and realize growth opportunities.Mr. Mitchell previously served on the board of directors of Pacific Premier (former Nasdaq: PPBI; 2018-2025, until its acquisition by Columbia), Western Asset Mortgage Capital Corporation (NYSE: WMC; 2012-2023, until its acquisition by TPG Mortgage Investment Trust, Inc.), and has served as a director of eight other public companies and three private-equity owned companies. He taught as an Adjunct Accounting Professor and a guest lecturer at the University of Redlands and he is Chairman Emeritus of the NACD, Pacific Southwest Chapter. He also served on the national board of NACD (2017-2019). Education: Bachelor's Degree in Accounting, University of AlabamaOther Public Board Directorships: Parsons Corporation (NYSE: PSN; 2013-present); TPG Mortgage Investment Trust, Inc. (NYSE: MITT; 2023-present).

Ms. Studenmund's experience includes 20 years of executive banking experience, having been a managing committee member and leading retail banking and business banking, primarily at First Interstate of California (now Wells Fargo), where she began as the Chief Marketing Officer. She then became Executive Vice President and Head of Retail and Business Banking for Home Savings of America and Great Western Bank, following the acquisition of First Interstate.After her banking career, Ms. Studenmund pivoted to digital businesses as President and Chief Operating Officer of PayMyBill.com, an early consumer platform acquired by Paytrust, and next as Chief Operating Officer of Overture Services, the successful, publicly traded pioneer of paid search advertising. She played a key role in positioning Overture for its $1.6 billion acquisition by Yahoo!, demonstrating strong operating, financial, and mergers and acquisitions experience.Ms. Studenmund also brings significant corporate governance experience. She has served on the boards of directors of Pacific Premier (former Nasdaq: PPBI; 2019-2025, until its acquisition by Columbia), ExlService Holdings (Nasdaq: EXLS; 2018-2025) and CoreLogic (Nasdaq: CLGX; 2012-2021). Education: Bachelor's Degree in Economics, Wellesley College; Master of Business Administration, Harvard Business SchoolOther Public Board Directorships: Select funds for Franklin Templeton's Western Asset Management (2004-present)

On July 28, 2026, the Board of Directors of Columbia Banking System, Inc. appointed Simone Lagomarsino to the Board of Directors of the Company.Ms. Lagomarsino, served as the President and a member of the board of directors of First Foundation Inc. (NYSE: FFWM) from July 2024 until its sale on April 1, 2026. Prior to joining First Foundation Inc., Ms. Lagomarsino was the President and Chief Executive Officer of Luther Burbank Corporation (Nasdaq: LBC) and its subsidiary Luther Burbank Savings, from January 2019 through February 2024. She also served on the board of directors of Luther Burbank Corporation and Luther Burbank Savings from December 2018 through February 2024. Ms. Lagomarsino served on the board of directors of the Federal Home Loan Bank of San Francisco from January 2013 through December 2024, and during her tenure she chaired the Audit, Risk and Regulatory Compliance Oversight Committees and was Chair of the board during 2022 and 2023. She also served on the board of directors of the Federal Reserve Bank of San Francisco from January 2022 through July 2024. Ms. Lagomarsino has a Bachelor of Arts in Economics from Claremont McKenna College and a Master of Business Administration in Finance from Claremont Graduate School.Columbia Banking System, Inc.appointed Subject to approval by the Oregon Department of Consumer and Financial Services Division of Financial Regulation, the Board of Directors of Columbia Bank, the Company's wholly owned subsidiary, effective as of September 1, 2026.

Ms. Giem has served as Executive Vice President, Chief Human Resources Officer of Columbia and of Columbia Bank since June 2025. Prior to Columbia, she served as Senior Vice President and Chief Human Resources Officer at Tri Counties Bank from May 2020 to May 2025, as Senior Vice President, HR and Talent Management Director at Banner Bank from 2016 to April 2020, as Executive Relationship Manager for Ultimate Software Computer Software from July 2016 to October 2016, as Director of Talent Management at Itron from June 2014 to July 2016, and as Vice President, Director of HR Systems and Payroll at Sterling Savings Bank from 2006 to 2014.

Effective as of November 20, 2025, Brock Lakely was appointed as Executive Vice President, Chief Accounting Officer and Corporate Controller of the Company. Mr. Lakely served from April 3, 2023 through November 19, 2024 as the Company's Chief Audit Executive. He previously served as the Company's Chief Accounting Officer from May 20, 2018 through April 3, 2023. Mr. Lakely is a Certified Public Accountant, and he began his career as an auditor at Ernst & Young LLP where he focused on the financial services industry. He earned his Bachelor of Business Administration in accounting from Southwestern Oklahoma State University and his Master of Business Administration from Oklahoma State University.

Mr. Namdar has served as Chief Credit Officer of Columbia since March 2023 and became Executive Vice President in May 2024. He has served as Executive Vice President, Chief Credit Officer of Umpqua Bank since November 2018. He served as Executive Vice President, Chief Credit Officer of Umpqua from November 2018 to February 2023, and as a senior credit officer of Umpqua Bank from 2012 to 2018

Mr. Deer has served as Chief Strategy and Innovation Officer of Columbia since March 2023 and became Executive Vice President in May 2024. He has served as Executive Vice President, Chief Strategy and Innovation Officer of Umpqua Bank since March 2023. He joined Columbia and Columbia Bank as Executive Vice President, Chief Financial Officer and served in that role from April 2020 to February 2023. Prior to Columbia, he was a Managing Director and Senior Research Analyst at Piper Sandler (and previously at Sandler O'Neill + Partners), where he covered West Coast financial institutions since 2007.

Mr. Anderson has served as Chief Administrative Officer of Columbia since March 2023 and became Executive Vice President in May 2024. He has served as Executive Vice President, Chief Administrative Officer of Umpqua Bank since September 2022, and he served in that same role for Umpqua from September 2022 to February 2023. He served as Senior Vice President, Chief Administrative Officer of Umpqua and of Umpqua Bank from June 2021 to September 2022. He joined Umpqua Bank in 2010 as an auditor, and has held a number of increasingly senior roles including Director of Investor Relations and Chief Data Officer.

Mr. Moore Devine has served as Chief Marketing Officer of Columbia since March 2023 and became Executive Vice President in May 2024. He has served as Executive Vice President, Chief Marketing Officer of Umpqua Bank since March 2023. He served as Executive Vice President, Chief Marketing and Experience Officer of Columbia and of Columbia Bank from January 2020 to February 2023. Prior to that, he served Columbia Bank as Executive Vice President, Chief Marketing Officer from April 2018 to January 2020, and as Senior Vice President, Director of Marketing from March 2011 to April 2018.