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Mr. Christopher D. Young became our President and Chief Executive Officer and was appointed as a member of our Board in November 2025. Mr. Young was previously the Executive Vice President - Business Development, Strategy and Ventures of Microsoft Corp. from 2020 to 2025. From 2017 to 2020, he was the Chief Executive Officer (CEO) of McAfee, LLC, one of the world's leading independent cybersecurity companies. Prior to that, Mr. Young was a Senior Vice President and General Manager at Intel Security Group, where he led the initiative to spin out McAfee. Previously, he led cybersecurity efforts at Cisco, RSA (a division of Dell EMC) and AOL. Mr. Young also led end-user computing at VMware and co-founded the company Cyveillance. Mr. Young currently serves on the board of directors of American Express and has previously served on the board of Qualcomm Incorporated, Snap Inc. and Rapid7, Inc. He is a former member of the Cybersecurity & Infrastructure Security Agency Cybersecurity Advisory Committee and a former member of the President's National Security Telecommunications Advisory Committee. He is a former director for the non-profit Cyber Threat Alliance and a former member of the Board of Trustees of Princeton University. Mr. Young received his Bachelor of Arts from Princeton University and his Master of Business Administration from Harvard University.

Mr. David DeStefano has been Chairperson of our Board since 2020. Mr. DeStefano previously served as the President and Chief Executive Officer from November 2016 to November 2025. Between 2015 and 2016 he was an Executive Vice President and a member of the Company's Executive Council, which monitored our long-term strategic and financial viability, corporate brand, and culture. Mr. DeStefano previously served as our Vice President, Chief Financial Officer and Executive Vice President. Prior to joining the Company, Mr. DeStefano was Principal and Vice President at The Mid Atlantic Companies Ltd. Mr. DeStefano is also on the Board of Trustees of the Joseph Fund in Camden, New Jersey, and is a member of the National Association of Corporate Directors (NACD). Mr. DeStefano received a BS in Finance from Lehigh University.

Mr. John R. Schwab became our Chief Financial Officer in 2020. Prior to joining the Company, Mr. Schwab served as Chief Financial Officer of Flagship Credit Acceptance from 2015 until 2019. Mr. Schwab began his career in assurance services at Arthur Andersen LLP. Mr. Schwab received a BS in Accounting from LaSalle University.

Mr. Bryan T. R. Rowland became our General Counsel in 2017. Prior to joining the Company, Mr. Rowland held various roles at Checkpoint Systems from 2005 to 2016, including serving as Senior Vice President, General Counsel, Chief Compliance Officer and Corporate Secretary from 2014 to 2016. Mr. Rowland received a BA in Psychology and Philosophy from Towson University and a Juris Doctorate degree from Villanova University Charles Widger School of Law.

Mr. Bradley M. Gayton joined our Board in 2021. Mr. Gayton previously served as the Senior Vice President, General Counsel of the Coca-Cola Company. Prior to joining The Coca-Cola Company, Mr. Gayton spent 29 years in various leadership positions at Ford Motor Company and most recently as Group Vice President, Chief Administrative Officer and General Counsel. Mr. Gayton has deep experience in law, governance, tax and technology. He brings a global perspective in terms of the tax obligations for multinational enterprises and has experience in developing solutions through organizational innovation. While at Ford, he led explorations to see how artificial intelligence could be used for different business applications and collaborated with Vertex on the company's tax compliance solutions worldwide. Mr. Gayton is a member of NACD. Mr. Gayton has a BS in Business Administration from the State University of New York at Buffalo, School of Management in 1986 and a JD from the State University of New York at Buffalo, Law School.

Mr. Eric C. Andersen has served on our Board since January 2008 and currently serves as our lead independent director. He began his career with 25 years at IBM, PricewaterhouseCoopers LLP (PwC), and PwC Consulting, where he held roles as a senior partner and executive, managing various businesses in the US, Asia, and globally. Over the past 15 years, he has specialized in private equity investing, serving as Managing Partner at two middle-market PE firms-Peak Equity and Milestone Partners-and as Managing Director at Silver Lake, a major technology-focused firm. Additionally, Mr. Andersen has recently served as an Adjunct Professor at the Villanova School of Business. He has been a board member for several private and public companies, including serving as Chairman of the Board for American Public Education Inc., a publicly traded online university system. Mr. Andersen earned his MBA from the Wharton School at the University of Pennsylvania and holds a BS from Bucknell University.

Ms. Amanda Westphal Radcliffe has served on our Board since 1993. Prior to joining our Board, Ms. Radcliffe served in a variety of roles at the Company, from technical software instructor, to finance, production, and middle market product teams. Prior to joining the Company, she was a Managing Director at Rosenbluth International, since acquired by American Express. Ms. Radcliffe is a Board member of Melmark, Inc., founding Board Member and Emeritus President of the Neurodiversity Employment Network of Philadelphia, Chair Emeritus of the Children's Hospital of Philadelphia Foundation Board of Advisors, and past Trustee, Chair Emeritus of the Drexel University, A.J. Drexel Autism Institute Board, and Chair Emeritus of Breastcancer.org. Ms. Radcliffe is also a member of the Philadelphia Chapter of Women Corporate Directors and NACD. Ms. Radcliffe holds a BA from Moravian University.

Ms. Stefanie Westphal Thompson has served on our Board since 1993. She joined the Company in 1991 and has served in a variety of roles, including Treasurer. Prior to joining the Company, Ms. Thompson was a Vice President at Chemical Bank (now part of Chase), where she specialized in managing the banking relationship for middle market companies. Ms. Thompson sat on Bryn Mawr Hospital's Foundation Board for eight years, serving as Head of their Trustee Committee and as Vice-Chair and is a member of NACD. Ms. Thompson also served on the Board of the Agnes Irwin School in Rosemont, Pennsylvania, for ten years, heading its Trustees Committee. Ms. Thompson earned an MBA in Finance from Fordham University and has a dual BA in Engineering and Economics from Lafayette College.

On September 30, 2026, the Board of Directors of Vertex, Inc. elected Mr. Debanjan Saha to serve as a director of the Company, effective October 7, 2026. Mr. Saha has served as Chief Executive Officer of DataRobot, an agentic artificial intelligence (AI) company, since September 2022. Under his leadership, DataRobot has transformed from a pioneer in machine learning to a leader in agentic AI, serving enterprise customers worldwide. Prior to DataRobot, Mr. Saha spent two decades building and scaling multi-billion-dollar data and cloud businesses. He served as Vice President and General Manager of Data Analytics at Google Cloud, and before that as Vice President and General Manager at Amazon Web Services, where he led the company's database services. Mr. Saha serves on the board of directors of Sorenson Communications and is a member of its audit committee. He is an Institute of Electrical and Electronics Engineers (IEEE) Fellow and a distinguished member of the Association for Computing Machinery (ACM). He received MS and PhD degrees from the University of Maryland and a Bachelor of Technology from the Indian Institute of Technology, Kharagpur, all in Computer Science.

Ryan Leib has been appointed as Principal Accounting Officer on March 15, 2024. Mr. Leib, age 46, joined the Company in January 2024 as its prospective Chief Accounting Officer. Mr. Leib will be appointed as the Company's Chief Accounting Officer on March 15, 2024. Prior to that, he most recently served as the Vice President of M&A and Portfolio Transformation at Trinseo PLC (Trinseo) from January 2022 to January 2024. Mr. Leib's tenure at Trinseo dates back to 2013 where he previously held roles as Vice President and Treasurer, Vice President, Global Controller and Principal Accounting Officer, Corporate Controller, and Assistant Corporate Controller. Earlier in his career, Mr. Leib worked at PricewaterhouseCoopers as a senior audit manager. Mr. Leib earned a bachelor's degree in Accounting from Saint Joseph's University and is a certified public accountant.