Sec Form 3 Filing - Delaware Project 4 L.L.C. @ T-Mobile US, Inc. - 2020-06-26

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Delaware Project 4 L.L.C. 2. Issuer Name and Ticker or Trading Symbol T-Mobile US, Inc. [ TMUS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) ONE CIRCLE STAR WAY 3. Date of Earliest Transaction (MM/DD/YY) 06/26/2020 (Street) SAN CARLOS, CA94070 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Contingent Value Right Note (right to acquire) ( 1 ) ( 1 ) ( 1 ) Common Stock $ 2,000,000,000 D ( 2 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Delaware Project 4 L.L.C. ONE CIRCLE STAR WAY SAN CARLOS, CA94070 X X Signatures Robert Townsend, Manager of DELAWARE PROJECT 4 L.L.C. 07/06/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Pursuant to the Contingent Value Right Note, aggregate principal amount of $2,000,000,000.00 (the "CVR Note"), the trust will deliver on the Exchange Date (June 1, 2023, which may be extended as provided for in the CVR Note) a number of shares of Common Stock with respect to each $1,000 principal amount of the CVR Note determined by an exchange rate set forth in the CVR Note. The exchange rate is based on the daily volume weighted average price of a share of Common Stock during the 40 trading days preceding June 1, 2023. The maximum number of shares of Common Stock that can be received pursuant to the CVR Note is approximately 3,566,400. The number of shares of Common Stock deliverable under the CVR Note is subject to acceleration and adjustment in certain circumstances. ( 2 )Delaware Project 4 L.L.C. ("Project 4 LLC") is a wholly owned subsidiary of Softbank Group Corp. ("SoftBank"). Marcelo Claure, Stephen Kappes, each members of the Board of Directors of the Issuer, and Ronald D. Fisher, who resigned from the Board of Directors on June 22, 2020, were elected as representatives of Softbank and its wholly owned subsidiaries SoftBank Group Capital Ltd, Delaware Project 6 L.L.C. and Project 4 LLC. As a result, each of these entities is a director by deputization for Section 16 purposes.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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