TMUS: 8-K company filing

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 16, 2026 T-MOBILE US, INC. (Exact name of registrant as specified in its charter) Delaware 1-33409 20-0836269 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) 12920 SE 38th Street Bellevue , Washington (Address of principal executive offices) 98006-1350 (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(s) Name of each exchange on which registered Common Stock, par value $0.00001 per share TMUS The NASDAQ Stock Market LLC 3.550% Senior Notes due 2029 TMUS29 The NASDAQ Stock Market LLC 3.700% Senior Notes due 2032 TMUS32 The NASDAQ Stock Market LLC 3.150% Senior Notes due 2032 TMUS32A The NASDAQ Stock Market LLC 3.200% Senior Notes due 2032 TMUS32B The NASDAQ Stock Market LLC 3.625% Senior Notes due 2035 TMUS35 The NASDAQ Stock Market LLC 3.850% Senior Notes due