Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934

Date of report (Date of earliest event reported): January 6, 2021
(Exact Name of Registrant as Specified in Charter)
Delaware 1-33409 20-0836269
(State or other jurisdiction (Commission File Number) (I.R.S. Employer
of incorporation or organization)
 Identification No.)
12920 SE 38th Street
Bellevue, Washington
(Address of principal executive offices)
(Zip Code)
Registrant’s telephone number, including area code: (425) 378-4000
(Former Name or Former Address, if Changed Since Last Report):
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:
Title of each class Trading Symbol Name of each exchange on which registered
Common Stock, par value $0.00001 per share TMUS The NASDAQ Stock Market LLC
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).
Emerging growth company
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Item 7.01 — Regulation FD Disclosure.

On January 6, 2021, T-Mobile US, Inc. (the “Company”) issued a press release announcing selected customer information for the quarter and year ended December 31, 2020.

A copy of the Company's press release is attached as Exhibit 99.1.

The information contained in this report will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as may be expressly set forth by specific reference in such a filing.

Item 8.01 — Other Events.

Included in this Current Report on Form 8-K as Exhibit 22.1 is a list of subsidiary guarantors and issuers of guaranteed securities and affiliates whose securities collateralize securities of the Company as of September 30, 2020.

Item 9.01 — Financial Statements and Exhibits.
(d) Exhibits:

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
January 6, 2021 /s/ Peter Osvaldik
Peter Osvaldik
Executive Vice President and Chief Financial Officer