Notice of 2020 Annual Meeting of Stockholders and Proxy Statement NOTICE OF ANNUAL MEETING OF STOCKHOLDERS Agenda: Ⅲ Elect 13 director nominees named in the Proxy Statement to the Company’s Board of Directors; Place: Ⅲ Ratify the appointment of PricewaterhouseCoopers LLP as the Company’s independent registered public accounting Online only at firm for the fiscal year ending December 31, 2020; www.virtualshareholder Ⅲ Conduct an advisory vote to approve the compensation provided to the Company’s named executive officers for 2019; meeting.com/TMUS2020 Ⅲ Vote on one stockholder proposal, if properly presented at the Annual Meeting; and Ⅲ Consider any other business that is properly brought before the Annual Meeting or any continuation, adjournment or postponement of the Annual Meeting. Record Date: You can vote your shares if you were a stockholder of record at the close of business on April 7, 2020. Date: YOUR VOTE IS VERY IMPORTANT. Whether or not you plan to virtually attend the Annual Meeting, please vote as soon June 4, 2020 as possible by internet, by telephone or by signing and returning your proxy card if you received a paper copy of the proxy card by mail. Due to the potential travel, community gathering and other impacts of coronavirus disease 2019 (COVID-19), the Annual Meeting will be held solely by means of remote communication, in a virtual only format. You will not be able to attend the Annual Meeting in person. You can virtually attend the Annual Meeting at the meeting time by visiting Time: www.virtualshareholdermeeting.com/TMUS2020 and entering the 16-digit control number included on your Notice of 8:00 a.m. PDT Internet Availability of Proxy Materials, proxy card or on the instructions that accompany your proxy materials. The Annual Meeting will begin promptly at 8:00 a.m. PDT. Online check-in will begin at 7:45 a.m. PDT, and you should allow ample time for the online check-in procedures. By hosting the Annual Meeting online, the Company is able to ensure the health and safety of its directors, officers, employees and stockholders. This approach also aligns with the Company’s broader sustainability goals. Attendance at the virtual Annual Meeting will provide you with the same rights to participate as you would have at an in-person meeting. Once admitted to the Annual Meeting, you may submit questions, vote or view our list of stockholders by following the instructions that will be available on the meeting website. By Order of the Board of Directors, Timotheus Höttges Chairman of the Board of Directors April 21, 2020 IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR THE ANNUAL MEETING OF STOCKHOLDERS TO BE HELD ON JUNE 4, 2020 The Proxy Statement and Annual Report to Stockholders are available at https://t-mobile.com/Proxy2020 and https://www.proxyvote.com. TABLE OF CONTENTS Proxy Statement Summary 1 Executive Compensation 29 Compensation Discussion and Analysis 29 Corporate Governance at T-Mobile 4 Compensation Committee Report 39 About the Board of Directors 5 Executive Compensation Tables 40 Annual Board and Committee Evaluations 6 Equity Compensation Plan Information 53 How to Communicate with our Board 6 Board Committees and Related Matters 7 Security Ownership of Principal Stockholders and Management 54 Board Risk Oversight 11 Director Compensation 12 Transactions with Related Persons and Approval56 Director Nomination, Selection and Qualifications 13 Related Persons Transactions 56 Related Person Transaction Policy 56 Proposal 1 - Election of Directors 17 Transactions with Deutsche Telekom and SoftBank 56 Executive Officers 24 Proposal 4—Stockholder Proposal for Limitations Proposal2-Ratification of the Appointment of on Accelerated Vesting of Equity Awards in the PricewaterhouseCoopers LLP as the Company’s Event of a Change of Control 63 Independent Registered Public Accounting Firm for FiscalYear 2020 26 Questions and Answers About the Annual Meeting and Voting 65 Pre-Approval Process 26 Fees Paid to PricewaterhouseCoopers LLP 26 Other Information and Business 68 Audit Committee Report 26 Appendix A—Reconciliation of Non-GAAP Financial Measures A-1 Proposal 3 – Advisory Vote to Approve the Compensation Provided to the Company’s Named Executive Officers for 2019 28 Proxy Statement Summary This summary highlights information you will find in this Proxy Statement. As it is only a summary, please review the complete Proxy Statement before you vote. 2020 Annual Meeting Information Date and Time: Location: Record Date: Proxy Mail Date: Thursday, Online only at April 7, 2020 On or about June 4, 2020 at www.virtualshareholder April 21, 2020 8:00 a.m. PDT meeting.com/TMUS2020 How to Vote By Internet: By Phone: By Mail: At the Annual Visit the website listed Call the telephone Sign, date and return Meeting: on your proxy card number on your your proxy card in the Vote electronically proxy card enclosed envelope at the virtual Annual Meeting Voting: Each share of common stock is entitled to one vote for each director nominee and one vote for each of the other proposals to be voted on. Admission: You can virtually attend the Annual Meeting at the meeting time by visiting www.virtualshareholdermeeting.com/ TMUS2020 and entering the 16-digit control number included on your Notice of Internet Availability of Proxy Materials, proxy card or on the instructions that accompany your proxy materials. The Annual Meeting will begin promptly at 8:00 a.m. PDT. Online check-in will begin at 7:45 a.m. PDT, and you should allow ample time for the online check-in procedures. Annual Meeting Agendaand Vote Recommendations: Board Vote Page Reference Matter Recommendation (for more details) Proposal1 Election of Directors FOR 17 Ratification of the Appointment of PricewaterhouseCoopers LLP as Proposal2 the Company’s Independent Registered Public Accounting Firm for FOR 26 Fiscal Year 2020 Advisory Vote to Approve the Compensation Provided to the Proposal3 FOR 28 Company’s Named Executive Officers for 2019 Stockholder Proposal for Limitations on Accelerated Vesting of Proposal4 AGAINST 63 Equity Awards in the Event of a Change of Control In this Proxy Statement, “we,” “our,” “us,” “T-Mobile” and the “Company” refer to T-Mobile US, Inc. as a standalone company prior to April 1, 2020, the date we completed the Sprint Combination (as defined below), and after April 1, 2020, refer to the combined company as a result of the Sprint Combination. “Annual Meeting” refers to the 2020 Annual Meeting of Stockholders. We first made this Proxy Statement and form of proxy card available to stockholders on or about April 21, 2020. PROXY SUMMARY STATEMENT Good Corporate Governance Practices Governance is real at T-Mobile. In connection with the business combination with MetroPCS Communications, Inc. completed in 2013 (the “Metro Combination”), T-Mobile became a publicly traded company with a significant stockholder, Deutsche Telekom AG (“Deutsche Telekom”). On April 29, 2018, we entered into the Business Combination Agreement with Sprint to merge in an all-stock transaction (the “Sprint Combination”), and on April 1, 2020, we completed the Sprint Combination. After the Sprint Combination we have two significant stockholders, Deutsche Telekom and SoftBank Group Corp. (“SoftBank”). Each of Deutsche Telekom and SoftBank has the right to designate a number of our directors, and as a result, we have stockholder representation on our Board. Directors approach each Board decision with a mindset that is intellectually independent from management. In addition, our Board has structured our corporate governance program to promote the long-term interest of stockholders, strengthen the Board’s and management’s accountability and help build public trust in the Company. Unclassified Board and Annual Election of Directors Annual Board and Committee Self-Evaluations 13 Director Nominees No Poison Pill Separation of Chairman and Chief Executive Officer Roles Stockholder Right to Call Special Meeting and Act by Written Consent Lead Independent Director Anti-Hedging, Anti-Short Sale and Anti-Pledging Policies Independent Chairs of the Audit, Compensation and Nominating and Executive Compensation Driven by Pay for Performance Corporate Governance Committees Regular Executive Sessions of Independent Directors Stock Ownership Guidelines for Executive Officers and Directors Comprehensive Risk Oversight by the Board and its Committees Clawback Policy to Recapture Incentive Payments T-Mobile Had Record Financials and Strong Customer Growth in 2019, Beating Increased Guidance While Balancing Growth and Profitability T-Mobile had record financial results in 2019, including record total revenues, record total service revenues, strong net income and record fourth quarter Adjusted EBITDA. We added 7.0 million total net customers in 2019, marking the sixth year in a row of more than 5 million total net customer additions. We ended the year with 86.0 million total customers, of which 67.9 million were total branded customers. We continued to successfully translate customer growth into industry-leading year-over-year service revenue percentage growth. In 2019, total revenues increased 4% year over year to a record of $45.0 billion, total service revenues increased 6% year over year to a record of $34.0 billion, net income increased 20% year over year to $3.5 billion, and Adjusted EBITDA increased 8% year over year to a record of $13.4 billion. In December 2019, we launched America’s first nationwide 5G network, including prepaid 5G with Metro by T-Mobile, covering more than 200 million people and more than 5,000 cities and towns across the United States with 5G. At the end of the fourth quarter of 2019, 327 million Americans were covered by our 4G LTE network. Our stock price increased by 374.7% from May 1, 2013 (the first day of trading after the Metro Combination) and 23.3% during 2019 alone. Adjusted EBITDA is a non-GAAP financial measure. This non-GAAP financial measure should be considered in addition to, but not as a substitute for, the information provided in accordance with U.S.