First Business Financial Services FBIZ

Corey A. Chambas has served as a director of FBFS since July 2002, as Chief Executive Officer since December 2006 and as President from February 2005 until January 2023. He served as Chief Operating Officer of FBFS from February 2005 to September 2006 and as Executive Vice President from July 2002 to February 2005. He served as Chief Executive Officer of FBB from July 1999 to September 2006 and as President of FBB from July 1999 to February 2005. Mr. Chambas has over 40 years of commercial banking experience. Prior to joining FBFS in 1993, he was a Vice President of Commercial Lending with M&I Bank, now known as BMO Bank, N.A. , in Madison, Wisconsin. Mr. Chambas announced his intention to retire as CEO effective May 2, 2026. Education- BBA, Finance, Investment & Banking, Wisconsin School of Business, University of Wisconsin-Madison. Other Boards and Organization -Director, FBB Board of Directors (since 2018, 2009-2011, 1999-2006) ,Advisory board member and advisor to the board of other private organizations.

On April 15, 2026, the Board of Directors of First Business Financial Services, Inc. appointed David R. Seiler as Director, President and Chief Executive Officer of the Company, effective May 3, 2026. Mr. Seiler has served as the President and Chief Operating Officer of the Company since January 3, 2023. He previously served as Chief Operating Officer of the Company from 2016 to January 2, 2023. He has served as a director and chair of the First Business Specialty Finance, LLC Board of Directors since 2021. Mr. Seiler brings over 30 years of financial services experience with leading commercial banking firms in the Midwest. Prior to joining the Company, he served as Managing Director of the Correspondent Banking Division of BMO Harris Bank. He received a bachelor's degree in Marketing and Business Administration and a master's degree in Real Estate Appraisal and Investment Analysis from the University of Wisconsin-Madison. Mr. Seiler is a board member of and a volunteer with Big Brothers Big Sisters of Dane County.

Brian D. Spielmann has served as Chief Financial Officer of FBFS since April 2023. Mr. Spielmann also serves as the Chief Financial Officer of the Bank. He also currently serves as a director of our FBSF subsidiary. Mr. Spielmann had been serving as the Corporation's Deputy Chief Financial Officer and Chief Accounting Officer since May 2022. Mr. Spielmann joined FBFS in 2006 and has held various positions including Chief Accounting Officer, Director of Finance, Financial Reporting Manager, and Senior Financial Accountant.

Bradley A. Quade has served as Chief Credit Officer of FBFS and the Bank since April 2020 and as Executive Vice President of FBFS since May 2024. Mr. Quade had been serving as the Corporation's Chief Credit Officer since October 2019. He also currently serves as a director for our FBFS subsidiary. Mr. Quade has over 35 years of experience in banking at publicly traded and privately-owned institutions and has led successful lending teams in commercial banking, investment real estate, equipment leasing, and treasury management. Prior to joining FBFS, Mr. Quade held the position of Senior Vice President with Johnson Bank in Milwaukee, Wisconsin.

James E. Hartlieb has served as President of FBB since 2015 and as Chief Executive Officer of FBB and a director of FBB since January 2023. Mr. Hartlieb joined FBB in 2009 as Senior Vice President of Greater Dane County. He also currently serves as a director of our FBSF subsidiary. Mr. Hartlieb has over 30 years of financial services experience. Prior to joining FBB, Mr. Hartlieb held the position of Regional President with AMCORE Bank in Madison, Wisconsin, which he held from 1998 to 2009.

Gerald L. (Jerry) Kilcoyne, Experience Managing Partner, Pinnacle Enterprises, LLC (since 1997) President, Northbrook Rail Corporation (1989-1996). Education AA, Accounting, Madison Area Technical College Other Boards and Organizations Chair, FBB Board of Directors (since November 2018, May 2010-June 2018) Director, FBB Board of Directors (since November 2018 and 2005-June 2018) Director, First Business Equipment Finance, LLC (2006-2017), and Director, First Business Capital Corp. (2006-2013), both FBB entities were merged into First Business Specialty Finance, LLC, a wholly-owned subsidiary of FBB in 2021, Director, Alterra Bank (2016-2017) until its charter consolidation with FBB in 2017.

Ralph R. Kauten, Experience Owner, Air-Lec Industries (since 2013) Biotechnology company executive: Co-Owner of Mirus Bio (1996-2024); Chair and CEO of Lucigen Corporation (2006-2018); Chair and CEO of Quintessence Biosciences, Inc. (2002-2016); Co-Founder, President and CEO of PanVera Corporation (1992-2001); and Vice President, Finance and Treasurer of Promega Corporation (1979-1992) Faculty Member, University of Wisconsin-Whitewater; Plant Controller, Heublein, Inc.; and Senior Auditor, Grant Thornton, CPAs. Education BBA, Accounting, University of Iowa MBA, Accounting, University of Wisconsin-Madison Other Boards and Organizations Director, FBB Board of Directors (since 2004); Chair (June 2018-November 2018) Member of boards of other private organizations. On January 29, 2026, Ralph R. Kauten provided First Business Financial Services, Inc. with notice of his intention to retire from the Company's Board of Directors effective as of the conclusion of the 2026 Annual Meeting of Shareholders, which is expected to be held on or about April 24, 2026.

Daniel P. Olszewski, Experience Director, Weinert Center for Entrepreneurship, Wisconsin School of Business, University of Wisconsin-Madison (since 2006) Chair/President, PNA Holdings, LLC, owner of Parts Now! and Katun Corporation (1999-2002, 2003-2005); CEO, Katun Corporation (2003-2005); CEO/President (1999-2003) and COO (1997-1999), Parts Now! Consultant, McKinsey & Company (1988-1990, 1992-1997). Education BA, Economics and Computer Science, University of Wisconsin-Madison MBA, Harvard Business School Other Boards and Organizations Director, FBB Board of Directors (since 2010) Director, First Business Capital Corp. (2011-2018), FBB entity merged into First Business Specialty Finance, LLC, a wholly-owned subsidiary of FBB in 2021 Member of the board of a private organization.

Laurie S. Benson, Experience CEO, LSB Unlimited, LLC (since 2009) ICEO Senior Advisor, LHH, International Center for Executive Options (Since 2025) Executive Director Emeritus (since 2025) and Executive Director (2016-2024), Nurses on Boards Coalition Co-Founder and CEO, Inacom Information Services (1984-2009). Education BS, Nursing, University of Wisconsin-Madison Other Boards and Organizations Director, FBB Board of Directors (since 2009) Member, FBB Northeast Wisconsin Advisory Board (2012-2021) Member of the boards of other private organizations.

Carla C. Chavarria, Experience Senior Vice President and Chief Human Resources Officer (since 2014) and various human resources roles (1994-2014), AMC Entertainment, Inc., a publicly traded company. Education BS, Business Administration, Pennsylvania State University Other Boards and Organizations Director, FBB Board of Directors (since 2018)

W. Kent Lorenz, Experience: Owner and Managing Director, Lakeside Consulting, LLC (since 2017) Chairman and CEO, Acieta LLC (2014-2017) President, Midwest Region, Ellison Technologies (2006-2014) and President, Ellison Machinery & Robotics of Wisconsin (1998-2006). Education BS, Engineering Mechanics, University of Wisconsin-Madison Other Boards and Organizations Director, FBB Board of Directors (since 2017) Member, FBB Southeast Wisconsin Advisory Board (2017-2021) Director, FBB-Milwaukee Board of Directors (2010-2017) Member of the boards and advisory boards of other private organizations

Mr. Graham, is a seasoned financial executive and private investor, with a strong background in financial strategy, capital allocation, and shareholder value creation. He founded Rationality Capital LLC in 2017 and has served as the principal at J Graham Consulting LLC since the same year. Mr. Graham served as Senior Vice President, Chief Financial Officer, and Treasurer at Journal Media Group, Inc., from 2015 to 2016, where he oversaw finance operations, developed capital allocation strategies, and led the negotiation of the company's sale. At Journal Communications, Inc., he served as Senior Vice President of Finance and Chief Financial Officer from 2014 to 2015 and Vice President/Corporate Controller from 2012 to 2014, where he led the finance, IT, treasury and risk management functions and managed multiple merger and acquisition transactions. Between 2006 and 2012, Mr. Graham held various roles at Brookdale Senior Living Inc., including Vice President/Corporate Controller, Senior Director of Financial Reporting, and Director of Financial Reporting. He served in various roles at KPMG LLP, advising Fortune 500 companies on financial reporting and merger and acquisition transactions from 2005-2006 and 1997-2003. Mr. Graham served on First Business Bank's Southeast Wisconsin Advisory Board from 2019 to 2025 and is actively involved in the community, serving on the boards of several private organizations. Education- BS, Accounting, Marquette University.

On May 22, 2026 the Board of Directors of First Business Financial Services, Inc. appointed Mr. Scott M. Ferris to its Board of Directors as of June 1, 2026. Mr. Ferris retired from BMO Financial Group in 2025, where he served as the Managing Director responsible for the commercial banking business within the Financial Institutions Group from November 2006 to January 2025. He joined BMO Harris Bank in 1985 and held various roles across commercial and corporate banking before assuming senior leadership positions within the Financial Institutions Group. Mr. Ferris brings deep expertise in credit, liquidity, market, and operational risk management, along with experience working with banking and market regulators.

Laura M. Garcia has served as Chief Risk Officer for FBFS and the Bank since March 2022. Prior to joining FBFS, she held the position of Head of North American Risk and Compliance, Managing Director for BMO Bank, N.A. in Chicago, Illinois, from 2018 to 2022. Ms. Garcia has over 30 years of experience in the financial services industry, centered in commercial banking, credit, compliance, and risk management.

Jodi A. Chandler has served as Chief Human Resources Officer of FBFS and the Bank since January 2010. Prior to that, she held the position of Senior Vice President-Human Resources for several years. She has been an employee of FBFS for over 30 years.

On April 1, 2023, the Board appointed Kevin D. Crampton, the Company's Senior Director of Accounting, as the Company's Chief Accounting Officer and Principal Accounting Officer effective as of the date of Mr. Spielmann's appointment to Chief Financial Officer. Mr. Crampton, joined the Company on June 29, 2022 as Senior Director of Accounting. Previously, Mr. Crampton served as Vice President with Goldman Sachs Bank USA from 2018 to April 2022 and as a Senior Manager, Financial Accounting and Advisory Services with Ernst & Young, LLP from 2007 to 2018. Mr. Crampton received a Bachelor of Arts in Accounting from Saint John's University and is a Certified Public Accountant.

Niamh M. Kristufek has served as President -Specialty Finance of FBFS and the Bank since January 2025. Prior to joining FBFS, she held the position of Head, U.S. Specialty Sales at BMO Bank, N.A. in Chicago, Illinois from June to December 2024 and Head of U.S. Business Banking for BMO Bank, N.A. from August 2018 to September 2024. She is also currently the Board Chair for Envision Unlimited, a non-profit located in Chicago, Illinois.

Daniel S. Ovokaitys has served as Chief Information Officer of FBFS and the Bank since June 2014. Prior to joining FBFS, Mr. Ovokaitys held the position of Head of Corporate IT (North/South America) for Merz Pharmaceuticals, located in Frankfurt, Germany, from 2010 to 2014. He also served as Director of IT for Aurora Health Care from 2006 to 2010 and Manager of IT for the American Transmission Company from 2000 to 2006.