Timotheus Höttges has served as a director of T-Mobile and Chairman of T-Mobile’s Board of Directors since April 30, 2013 and is the chair of both the CEO Selection Committee and the Executive Committee of T-Mobile’s Board of Directors. Since January 2014, Mr. Höttges has served as chief executive officer of Deutsche Telekom, T-Mobile’s majority stockholder and a leading integrated telecommunications company. From March 2009 to December 2013, he served as Deutsche Telekom’s chief financial officer (CFO) and a member of the board of management. From December 2006 to March 2009, he was a member of the board of management responsible for the T-Home Unit (fixed-network and broadband business, as well as integrated sales and service in Germany). From January 2003 to December 2006, Mr. Höttges headed European operations as a member of the Board of Management of T-Mobile International. Timotheus also currently serves on the board directors of Mercedes-Benz Group AG and previously served on the board of directors of Henkel AG & Co. KgaA and BT Group plc.

Mr. Höttges studied Business Administration at the University of Cologne.

Raphael Kübler has served as a director of T-Mobile since April 30, 2013, and is a member of the Compensation Committee, Executive Committee, and Nominating and Corporate Governance Committee of T-Mobile’s Board of Directors. In January 2014, Mr. Kübler assumed the position of Senior Vice President of the Corporate Operating Office of Deutsche Telekom, T-Mobile’s majority stockholder and a leading integrated telecommunications company, and reports directly to the Chief Executive Officer of Deutsche Telekom. From July 2009 to December 2013, Mr. Kübler served as a Senior Vice President Group Controlling at Deutsche Telekom. In this position, he was responsible for the financial planning, analysis, and steering of the overall Deutsche Telekom Group as well as the financial management of central headquarters and shared services. From November 2003 to June 2009, Mr. Kübler served as Chief Financial Officer of T-Mobile Deutschland GmbH, the mobile operations of Deutsche Telekom in Germany now known as Telekom Deutschland GmbH (a wholly owned subsidiary of Deutsche Telekom). Mr. Kübler has previously served on the board of directors of Hellenic Telecommunications Organization (OTE) from 2013 to 2018 and Ströer SE & Co. KGaA from 2018 to 2022.

Mr. Kübler studied Business Administration at H.E.C. in Paris and the Universities of Bonn and Cologne. He holds a doctoral degree from the University of Cologne.

André Almeida has served as a director of T-Mobile since June 2023 and is a member of the Compensation Committee, Nominating and Corporate Governance Committee, and Transaction Committee of T-Mobile’s Board of Directors. Mr. Almeida is an experienced telecommunications executive with demonstrated success in the telecommunications and media industries, with a focus on end-to-end and full profit and loss responsibility across the consumer and B2B segment. He served as Deutsche Telekom’s head of Investment and Portfolio Management from May 2021 to December 2024. Prior to that, he served as the European Head of Consumer and B2B Telco of Deutsche Telekom from September 2017 to May 2021, responsible for residential and B2B telco for 10 countries. From May 2020 to November 2020, he served as the Interim CEO of the European segment of Deutsche Telekom. Prior to that, from September 2013 to September 2017, he served as a Board Member for Residential Customers Portugal and International Operations at NOS SGPS, where he led the teams responsible for the residential customer segment (fixed network and mobile communications), product management, marketing, and sales. From 2010 to 2013, he served as a Board member of International Operations, Strategy, Group Controlling and Corporate Finance at ZON Multimedia, one of Portugal’s largest companies. Prior to that, he served as a Board member in the residential segment of ZON, Multimedia for three years. Prior to that, he also served in several leadership positions at Portugal Telecom where he became VP Business Development and Pricing.

Mr. Almeida holds a Bachelor’s degree in Industrial Management Engineering from the Instituto Superior Técnico in Lisbon and a Master of Business Administration degree from Institut Européen d’Administration des Affaires.

Thorsten Langheim has served as a director of T-Mobile since April 30, 2013 and is a member of the CEO Selection Committee, Executive Committee and the chair of the Transaction Committee of T-Mobile’s Board of Directors. Mr. Langheim joined the board of management of Deutsche Telekom, T-Mobile’s majority stockholder and a leading integrated telecommunications company, on January 1, 2019, where he is responsible for the “USA and Group Development” Board department, overseeing Deutsche Telekom’s U.S. business as well as corporate development, portfolio strategy, and group M&A activities. This includes overseeing Deutsche Telekom’s 12% stake in BT Group as well as the management of Deutsche Telekom’s subsidiaries T-Mobile Netherlands and Deutsche Funkturm. In addition, Mr. Langheim also serves as the Chairman and Co-founder of Deutsche Telekom Capital Partners, where he is responsible for the venture capital and private equity activities of Deutsche Telekom.

Prior to that, from 2009 to December 2018, he first served as Senior Vice President of Corporate Development and then as Executive Vice President Group Development at Deutsche Telekom. Prior to his roles at Deutsche Telekom, Mr. Langheim was Managing Director at the Private Equity Group of The Blackstone Group, an asset management and financial services company, from May 2004 to June 2009, primarily focusing on private equity investments in Germany. Before that, Mr. Langheim was Investment Banker and Vice President of European M&A at J.P. Morgan in London and Assistant Director at WestLB in Düsseldorf between 1995 and 2004.

Mr. Langheim is a member of the Supervisory Board of Deutsche Sporthilfe and FC Bayern München AG as well as Chairman of Deutsche Funkturm. Mr. Langheim holds a Master of Science degree in International Securities, Investment, and Banking from the ISMA Centre for Education and Research at the University of Reading (United Kingdom) and a Bachelor’s degree (Hons) in European Finance and Accounting from the University of Bremen (Germany) and Leeds Business School (United Kingdom).

Marcelo Claure has served as a director of T-Mobile since April 1, 2020, and is a member of the CEO Selection Committee, Compensation Committee, Executive Committee, and Transaction Committee of T-Mobile’s Board of Directors. Mr. Claure is a global entrepreneur and investor, and Founder & CEO of Claure Group, a multibillion-dollar global investment firm spanning multiple high-growth sectors, including AI & technology, energy transition, fashion and entertainment, and sports. Through his investment firm, Claure Group, Mr. Claure provides strategic capital and expertise to many of his portfolio companies’ and funds’ management teams, including SHEIN, the fastest growing on-demand fashion company globally, where he is Group Vice Chairman; Brightstar Capital Partners, a private investment firm focused on middle-market companies, where he is Co-Chairman, Bicycle Capital, Latin America’s leading growth equity fund; Open Opportunity Fund, a fund supporting Black and Hispanic tech founders in the US; and eB Capital, a Brazil-focused investment platform.

Additionally, Mr. Claure is the Co-Chair of Digital Data Design (D^3) Institute at Harvard Business School, an organization which focuses on shaping the future of business and society through digital and AI-driven business initiatives. Mr. Claure served as the Chief Executive Officer of SoftBank International and the Chief Operating Officer of SoftBank from May 2018 until January 2022. In addition, Mr. Claure served as a director of SoftBank from 2017 to 2020. He was also Executive Chairman of WeWork from October 2019 until January 2022. Previously, Mr. Claure served as Sprint’s President and Chief Executive Officer, serving as President from August 2014 until January 2018 and as Chief Executive Officer from August 2014 until May 2018. Mr. Claure was Executive Chairman of Sprint prior to the Sprint Combination and served on the Sprint board of directors. Prior to joining Sprint, Mr. Claure was Chief Executive Officer of Brightstar Corp., a company he founded in 1997 and grew from a small Miami-based distributor of mobile device accessories into a global business with more than $10 billion in gross revenue for the year ended 2013.

Mr. Claure received a B.S. in Economics and Finance and an honorary Doctorate of Commercial Science from Bentley University. He also received an honorary Doctorate of Laws from Babson College. He is also an Executive Fellow at Harvard Business School.

Dominique Leroy has served as a director of T-Mobile since November 2020, and is a member of the Nominating and Corporate Governance Committee of T-Mobile’s Board of Directors. Since November 2020, Ms. Leroy has served as a member of the Board of Management of Deutsche Telekom AG. Ms. Leroy has over 30 years of experience in the consumer goods and telecommunication sector. She started her career at Unilever where her last position was Managing Director for Belgium and Luxembourg. In 2011, she joined Proximus (formerly Belgacom) where she quickly became Head of the Consumer Market and held the position of CEO from 2014 to 2019. As the CEO of Proximus, she managed to turn around the company with a continuous growth phase and a strong customer experience focus. Ms. Leroy started her career at Unilever where her last position was Managing Director for Belgium and Luxembourg. Ms. Leroy currently serves as a director at Compagnie de Saint Gobain and Hellenic Telecommunications Organization (“OTE”). She has also been a Board Member at Royal Ahold Delhaize, Lotus Bakeries, Proximus, and BICS.

She holds a Master’s degree in Commercial Engineering and Management from the Solvay Business School in Brussels.

Thomas Dannenfeldt has served as a director of T-Mobile since June 2025 and is a member of the Compensation Committee and Transaction Committee of T-Mobile’s Board of Directors. Mr. Dannenfeldt currently serves as the Chairman of the Supervisory Board of Ceconomy AG, the largest European consumer electronic retailer, since February 2021. Additionally, since April 2020, he serves on the Board of Directors of Nokia Oyi (“Nokia”), one of the leading European telecommunications infrastructure providers. He is the Chairman of the Personnel Committee of the Board of Directors of Nokia. Mr. Dannenfeldt previously served as the Chief Financial Officer of Deutsche Telekom AG (“Deutsche Telekom”), from January 2014 to December 2018. Prior to that, he was the Finance Director of Telekom Deutschland from April 2010 to December 2013. Mr. Dannenfeldt started his career at Deutsche Telekom in 1992 and has more than 20 years of experience in various leadership roles in sales, marketing, and finance in the national and international mobile and fixed-line telecommunications business. He also served on the Board of Directors of T-Mobile from 2013 to 2018, Virgin Mobile in the UK in 2003 and 2004, as well as the Chairman of the Board of Directors of EE Limited in 2014 and 2015. He holds a Master’s degree in Mathematical Economics from the University of Trier, Germany.

Letitia A. Long has served as a director of T-Mobile since June 2021, and is a member of the Nominating and Corporate Governance Committee of T-Mobile's Board of Directors. Ms. Long currently serves on the Virginia Tech Board of Visitors and the Chair of the Board of the Intelligence & National Security Alliance. Ms. Long currently serves on the board of directors of Parsons Corporation, Corporate Office Properties Trust Defense Properties, and certain private companies. She previously served on the board of directors of Urthecast Corporation from 2015-2018, the board of directors of Raytheon Company from 2015-2020, and the board of directors of Sonatype from 2017-2019. Additionally, she was the Deputy Director of Naval Intelligence for the Department of Defense from 2000-2003, the Deputy Undersecretary of Defense Intelligence (Planning, Policy & Resources) from 2003-2006, the Deputy Director of the Defense Intelligence Agency from 2006-2010, and the Director of the National Geospatial-Intelligence Agency from 2010-2014.

Ms. Long received her Bachelor of Science in Electrical Engineering from Virginia Polytechnic Institute and State University and her Master of Science in Engineering from The Catholic University of America.

Srikant M. Datar has served as a director of T-Mobile since April 30, 2013, and is the chair of the Audit Committee of T-Mobile’s Board of Directors. Mr. Datar is the George F. Baker of Administration and Dean of Faculty of the Graduate School of Business Administration at Harvard University since January 2021. Mr. Datar is a Chartered Accountant and planner in industry and has been a professor of accounting and business administration at Harvard since July 1996. He previously served as a professor at Stanford University and Carnegie Mellon University. Mr. Datar received gold medals upon his graduation from the Indian Institute of Management, Ahmedabad, and the Institute of Cost and Works Accountants of India. Mr. Datar is also a member of the board of directors of ICF International Inc., where he is a member of the corporate governance and nominating committee. Mr. Datar previously served on the board of directors of Novartis AG, where he was also the chairman of the audit and compliance committee, and a member of the chairman's committee, the risk committee, and the compensation committee. He also served on the board of directors of Stryker Corporation, where he was a member of the audit and finance committees.

Mr. Datar holds a Master's degree in Statistics and Economics and a Ph.D. in Business from Stanford University.

Mike Sievert is president and chief executive officer of T-Mobile and is a member of the Executive Committee and Transaction Committee of T-Mobile’s Board of Directors. Mr. Sievert served as our Chief Operating Officer from February 2015 to June 2018 and our President and Chief Operating Officer from June 2018 to April 2020. From April 2013 to February 2015, he served as our Executive Vice President and Chief Marketing Officer, and from November 2012 to April 2013, Mr. Sievert was Executive Vice President and Chief Marketing Officer of T-Mobile USA.

Prior to joining T-Mobile USA, Mr. Sievert was an entrepreneur and investor involved with several Seattle-area start-up companies. From April 2009 to June 2011, he was Chief Commercial Officer at Clearwire Corporation, a broadband communications provider, responsible for all customer-facing operations. From February 2008 to January 2009, Mr. Sievert was co-founder and Chief Executive Officer of Switchbox Labs, Inc., a consumer technologies developer, leading up to its sale to Lenovo. He also served from January 2005 to February 2008 as Corporate Vice President of the worldwide Windows group at Microsoft Corporation, responsible for global product management and P&L performance for that unit. Prior to Microsoft, he served as Executive Vice President and Chief Marketing Officer at AT&T Wireless for three years. He also served as Chief Sales and Marketing Officer at E*TRADE Financial and began his career with management positions at Procter & Gamble and IBM. He has served on the boards of Rogers Wireless Communications in Canada, Switch & Data Corporation, and a number of technology start-ups. He currently serves on the Starbucks board of directors.

Mr. Sievert holds a Bachelor’s degree in Economics from the Wharton School at the University of Pennsylvania.

Dr. Christian P. Illek has served as a director of T-Mobile since November 2018, and is a member of the CEO Selection Committee, Compensation Committee, Executive Committee, and Transaction Committee of T-Mobile’s Board of Directors. Since January 2019, Dr. Illek serves as the Chief Financial Officer of Deutsche Telekom, our significant stockholder and a leading European telecommunications company. Since April 2015, he has been a Member of the Management Board of Deutsche Telekom: First as Chief Human Resources Officer (April 2015 to December 2018), then as Chief Financial Officer (January 2019 onwards). Dr. Illek currently serves as Chairman of the Supervisory Board of Telekom Deutschland. From January 2019 to February 2024, he served as Chairman of the Supervisory Board of Deutsche Telekom Services Europe. Furthermore, he served as Chairman of the Supervisory Board of T-Systems International from November 2016 to June 2021. Dr. Illek was Chairman of the Management Board of Microsoft Germany from September 2012 to March 2015. From April 2010 to September 2012, he was Director of Marketing at Telekom Deutschland. In this position, he was responsible for all marketing activities for both consumers and business customers in Germany. He also was in charge of the Wholesale Center, the Value- Added Services Center, and international product development for Deutsche Telekom’s fixed network, IP TV, and business customer portfolio. Before joining Deutsche Telekom, Dr. Illek held various managerial positions at Bain and at Dell, both in Germany and Switzerland.

Dr. Illek studied chemistry and business administration in Düsseldorf and Munich, beginning his career at the University of Munich in 1989.

Teresa A. Taylor has served as a director of T-Mobile since April 30, 2013 and has been T-Mobile’s lead independent director since May 1, 2013. Ms. Taylor is also a member and chair of the Nominating and Corporate Governance Committee, a member of the Audit Committee and CEO Selection of T-Mobile’s Board of Directors. Since April 2011, Ms. Taylor has served as Chief Executive Officer of Blue Valley Advisors, LLC, an advisory firm. Ms. Taylor served as Chief Operating Officer of Qwest Communications, Inc., a telecommunications carrier, from August 2009 to April 2011. She served as Qwest’s Executive Vice President, Business Markets Group, from January 2008 to April 2009 and served as their Executive Vice President and Chief Administrative Officer from December 2005 to January 2008. Ms. Taylor served in various positions with Qwest and the former US West beginning in 1987. During her 24-year tenure with Qwest and US West, she held various leadership positions and was responsible for strategic planning and execution, sales, marketing, product, network, information technology, human resources, and corporate communications. Ms. Taylor also is a director of Black Hills Corporation, and was previously a director of NiSource, Inc. and First Interstate BancSystem, Inc., where she served as chair of the compensation committee.

Teresa received a Bachelor of Science degree from the University of Wisconsin-LaCrosse.

James J. Kavanaugh has served as a director of T-Mobile since July 2023 and, after August 1, 2023, a member of the Audit Committee of T-Mobile’s Board of Directors. Mr. Kavanaugh has been the chief financial officer of International Business Machines Corporation (“IBM”) since January 2018, overseeing accounting and controllership, financial planning and analysis, tax, internal audit, investor relations, corporate strategy, corporate development and treasury of the company’s worldwide financial operations. Prior to that, he was senior vice president, Transformation & Operations, where he was responsible for redesigning IBM’s operating model to align with fundamental market shifts and driving new ways of working while incorporating speed and agility through the enterprise. In his current role as the CFO, Mr. Kavanaugh continues to oversee Transformation & Operations, including the Chief Information Office, as well as the company’s Global Chief Data Office, Enterprise Operations & Services and Real Estate Operations. Mr. Kavanaugh first joined IBM in 1996 from AT&T Corporation, where he was the chief financial officer, Americas Global Services. He earned his Master of Business Administration degree from The Ohio State University.