Adtran ADTN

Thomas R. Stanton is the Chairman of the Board and Chief Executive Officer of Adtran Holdings, having served as a director since 2005. Background Information: Thomas Stanton was named our Chief Executive Officer in September 2005 and named Chairman of the Board in 2007. He has also served as Chief Executive Officer and Chairman of the Board of ADTRAN International, Inc., a subsidiary of the Company formerly known as ADTRAN Asia-Pacific, Inc., since September 2005. Furthermore, he is the Chief Executive Officer of Adtran Networks SE, the Company's majority-owned subsidiary and formerly ADVA Optical Networking SE (Adtran Networks), and a member of its management board. Mr. Stanton joined Adtran in 1995 as Vice President of Marketing for the Carrier Networks (CN) Division. Since that time, he has held a number of senior management positions within the Company, including Senior Vice President and General Manager of the CN Division. Prior to joining Adtran, he served as Vice President of Marketing and Engineering at Transcrypt International and held several senior management positions with E. F. Johnson Company. Mr. Stanton has served on the board of directors of a number of technology companies and is a past chairman of the board for both the Federal Reserve Bank of Atlanta's Birmingham Branch and the Telecommunications Industry Association. He also served on the board of Cadence Bank, formerly BancorpSouth Bank, from October 2015 through February 2026, where he served on the Compensation Committee and as the Chair of the Risk Committee. In addition, Mr. Stanton previously served as a director of the Huntsville Chamber of Commerce, the Telecommunications Industry Association, and the Economic Development Partnership of Alabama. Mr. Stanton holds a Bachelor of Science degree in Computer Engineering from Auburn University.

On March 6, 2025, the company announced the appointment of Mr. Timothy Santo as Senior Vice President of Finance and Chief Financial Officer of the Company, effective as of Mr. Santo's employment start date, which is expected to be March 10, 2025. Mr. Santo will also serve as the Company's Principal Accounting Officer and as the Company's Treasurer. Before joining the Company, Mr. Santo, age 48, served at Conn's, Inc. in a variety of roles, including as Chief Financial Officer (February 2024 to March 7, 2025), Interim Chief Financial Officer (November 2023 to February 2024), and Vice President and Chief Accounting Officer (April 2023 to November 2023). Prior to that, he served as Senior Vice President & Global Controller of PRA Group, Inc. from 2018 to 2023. From 2017 to 2018, Mr. Santo served as a Senior Manager of the Business Advisory Services and Finance Transformation Group at Grant Thornton LLP. Prior to joining Grant Thornton, Mr. Santo spent well over a decade at General Electric and GE Capital in several executive level finance and operational leadership roles. Mr. Santo started his career in audit at PricewaterhouseCoopers LLP. Mr. Santo has a Master of Business Administration from the University of Rochester and a Bachelor of Science in Accounting and is a certified public accountant.

Mr. Christoph Glingener, 2022 to present Chief Executive Officer (ADVA Optical Networking SE) and 2007 to 2022 Chief Technology Officer of ADVA Optical Networking SE. On May 23, 2023, ADVA Optical Networking SE a majority-owned subsidiary of ADTRAN Holdings, Inc. announced that Christoph Glingener, Chief Technology Officer of the Company, will step down as Chief Executive Officer of ADVA effective June 30, 2023, at which time he will transition to his previous role of Chief Technology Officer of ADVA. He will continue to serve as CTO of the Company.

James D. Wilson, Jr., has served as ADTRAN's Chief Revenue Officer since August 2019. Mr. Wilson joined ADTRAN in 1998 and previously served as the Senior Vice President of Technology and Strategy, Senior Vice President and General Manager of the Carrier Networks Division, Vice President of Product Marketing, Director of Carrier Networks Product Management, Product Manager and Product Support Engineer. Mr. Wilson holds a Bachelor of Engineering in Electrical Engineering from Vanderbilt University.

H. Fenwick Huss is an Independent Director of Adtran Holdings, having served since 2002. Background Information: Fenwick Huss retired from Baruch College, a senior college of The City University of New York, in December 2022, where he served as the Willem Kooyker Dean of the Zicklin School of Business from July 2014. He also served as a tenured Professor in Baruch's Stan Ross Department of Accountancy. He previously served as Dean of the J. Mack Robinson College of Business at Georgia State University from 2004 to 2014. Prior to his appointment as Dean, Dr. Huss was Associate Dean from 1998 to 2004 and Director of the School of Accountancy at Georgia State from 1996 to 1998, and on the faculty since 1989. He also served on the faculty of the University of Maryland as an assistant professor from 1983 to 1989 and is a visiting professor at the Universite Paris 1 Pantheon-Sorbonne.

Nikos Theodosopoulos is an Independent Director of Adtran Holdings, having served since 2022. Background Information: Nikos Theodosopoulos served as chairman of the supervisory board of Adtran Networks from January 2015 until August 2022. He has served on the board of directors of Hercules Capital, Inc., a specialty finance company in the technology, life sciences and sustainable and renewable technology industries, since 2023. Mr. Theodosopoulos also previously served on the boards of Arista Networks, a computer networking company, from March 2014 to June 2023 and Harmonic Inc., a global provider of broadband access solutions and video delivery software, products, system solutions and services, from March 2015 to August 2022. Since August 2012, Mr. Theodosopoulos has served as an independent director, advisor and consultant in the technology and financial services industries through his advisory firm, NT Advisors LLC. From 1994 through 2012, he was an equity research analyst, primarily at UBS Group AG, an investment bank and financial services company, covering the technology sector, where he eventually served as Managing Director, Global Technology Strategist and Technology Sector Head of U.S. Equity Research. Prior to his career in investment banking, he spent 10 years at AT&T Network Systems and Bell Laboratories. He holds a Master of Business Administration from New York University, a Master of Science from Stanford University, and a Bachelor of Science from Columbia University.

Kathryn A. Walker is an Independent Director of Adtran Holdings, having served since 2014. Background Information: Kathryn Walker has more than 30 years of experience in the communications industry. Since 2009, she has served as a managing director for OpenAir Equity Partners, a venture capital firm focusing on the wireless, communications and mobile internet sectors. Ms. Walker also served as the Chief Technology Officer of Main Street Data, an agriculture data science company founded by OpenAir Equity Partners, from 2020 to 2024. Prior to joining OpenAir Equity Partners, Ms. Walker worked in a variety of roles at various subsidiaries of Sprint Corporation from 1985 to 2009, culminating in the position of Chief Information and Chief Network Officer at Sprint Nextel Corporation. She currently serves on the Board of Governors and Council of Trustees of South Dakota State University Foundation, on the Board of Trustees of Missouri S&T, and as the Chair of the Kummer Missouri S&T Foundation. Ms. Walker is a National Association of Corporate Directors (NACD) Board Leadership member. Ms. Walker also was elected to the NACD Directorship 100 in 2021 in recognition of her corporate governance expertise.

Jacqueline H. Rice is an Independent Director of Adtran Holdings, having served since 2016. Background Information: Jackie Rice has served as Chief Legal Officer and Corporate Secretary of MillerKnoll, Inc., a design and manufacturing company that researches, designs and manufactures interior furnishings for use in various environments, including residential, office, healthcare and educational settings, since May 2025. Previously, she served as General Counsel and Corporate Secretary of MillerKnoll, Inc. from February 2019 to May 2025. Prior to joining MillerKnoll, Inc., Ms. Rice served as Principal of RH Associates, a global consulting firm providing legal, risk and compliance advisory services for clients across all industries and geographies, from January 2018 to January 2019. From 2014 to 2017, Ms. Rice served as Target Corporation's Executive Vice President and Chief Risk and Compliance Officer with responsibility for enterprise and vendor risk, corporate security and corporate compliance and ethics. Prior to joining Target, she served as Chief Compliance Officer and legal counsel of General Motors from 2013 to 2014 and Executive Director, Global Ethics and Compliance of General Motors from 2010 to 2013. Ms. Rice served on the board of directors of the Michigan West Coast Chamber of Commerce for a four-year term from 2021 until 2024. Ms. Rice graduated from the University of Detroit Mercy School of Law, where she was editor-in-chief of the Law Review, and she obtained her undergraduate degree from James Madison College at Michigan State University.

Gregory J. McCray is an Independent Director of Adtran Holdings, having served since 2017. Background Information: Gregory McCray is an experienced executive with more than 30 years of business, marketing, sales, engineering, operations, mergers and acquisitions, management and international experience in the communications technology industry. Since August 2024, Mr. McCray has served as the CEO of PBE Axell, a global company that provides communications systems, monitoring/tracking products, and proximity avoidance systems for industrial, commercial, and public safety markets. Prior to that, Mr. McCray held numerous management and executive roles, including: Chairman and CEO of FDH Infrastructure Services, an engineering, technology, and science company that develops products and software to monitor and inspect infrastructure assets (May 2018 to May 2024); CEO of Google Fiber, a provider of fiber broadband internet service (2017); CEO of Aero Communications Inc., which provides installation, services and support to the communications industry (2013 to 2016); CEO of Antenova, a developer of antennas and radio frequency modules for mobile devices (2003 to 2012); Chairman and CEO of PipingHot Networks, which brought broadband fixed wireless access equipment to market (2001 to 2002); and Senior Vice President of customer operations at Lucent Technologies, where he managed the Customer Technical Operations Group for Europe, the Middle East and Africa (1996 to 2000). Mr. McCray has also served on the board of directors of Belden Inc, where he serves on the Finance Committee and the Nominating and Corporate Governance Committee, since February 2022; DigitalBridge Group, Inc., where he serves as a member of the Nominating and Corporate Governance Committee and Chairman of the Compensation Committee, since January 2021; and FreeWave Technologies (a private Industrial IoT company) since 2019. Previously, Mr. McCray served as a director of CenturyLink, Inc., the third largest network operator in America, from January 2005 to February 2017, where he served as chairman of the Cyber Security & Risk Committee from 2015 to 2017. Mr. McCray holds a Bachelor of Science degree in Computer Engineering from Iowa State University and a Master of Science degree in Industrial & Systems Engineering from Purdue University. He has also completed executive business programs at Harvard, INSEAD, and the University of Illinois. He was inducted into the Iowa State University Engineering Hall of Fame in 2022.

On June 23, 2026, the Board of Directors of ADTRAN Holdings, Inc. unanimously approved increasing the Board size from six to seven and elected Anne DelSanto to fill the resulting vacancy, effective July 1, 2026. Ms. DelSanto brings more than 30 years of experience in the global technology industry focused on cloud computing, software-as-a-service (SaaS), artificial intelligence, and enterprise go-to-market strategy. Her professional career included executive operational and technical roles at companies including Salesforce, Oracle, and IBM. Ms. DelSanto currently serves on the board of directors of Advanced Energy (NASDAQ: AEIS), a company that designs and manufactures precision power solutions for hyperscale AI, semiconductor, and industrial markets, and on the boards of private technology companies, Axonius and StackAdapt. She formerly served on the boards of Juniper Networks and New Relic, both during their tenure of being publicly traded. Ms. DelSanto holds a Bachelor of Science in mathematics with a concentration in computer science from St. John's University and a Master of Science in administrative studies from Boston College. She has also completed advanced governance studies at Stanford University Law School's Directors' College.