X0306 4 2021-09-23 0 0001283699 T-Mobile US, Inc. TMUS 0001065521 SOFTBANK GROUP CORP TOKYO PORTCITY TAKESHIBA 1-7-1 KAIGAN MINATO-KU TOKYO M0 105-7537 JAPAN 1 0 0 0 0001815949 Delaware Project 6 L.L.C. 1 CIRCLE STAR WAY 4F SAN CARLOS CA 94070 1 0 0 0 Common Stock 2021-09-23 4 X 0 26348874 D 79942749 I By: Delaware Project 6 L.L.C. Common Stock 2021-09-23 4 X 0 19017795 D 60924954 I By: Delaware Project 6 L.L.C. Call option (obligation to sell) 2021-09-23 4 X 0 26348874 D 2020-06-22 2024-06-22 Common Stock 26348874 18556605 I By: Delaware Project 6 L.L.C. Fixed price call options for which the per share strike price is $101.455 (the "Fixed Options"). Deutsche Telekom AG ("DT") has, pursuant to the terms of the Fixed Options, elected to pay the exercise price for these options in the form of 133,672,515 no par value registered shares of DT ("DT Shares"). Floating price call options for which the aggregate strike price is equal to 91,327,485 DT Shares. Marcelo Claure, an executive officer of SoftBank Group Corp. is a member of the Board of Directors of the Issuer. As a result each of the Reporting Persons may be a director by deputization for Section 16 purposes. Mr. Claure disclaims beneficial ownership of the shares of common stock and call options reported in this filing, except to the extent of his pecuniary interest therein. /s/ Natsuko Ohga, Head of Corporate Legal Department of SOFTBANK GROUP CORP. 2021-09-27 /s/ Stephen Lam, Manager of DELAWARE PROJECT 6 L.L.C 2021-09-27