T-Mobile US, Inc. 8-K

What Happened
T-Mobile US, Inc. filed Form 8-K on April 28, 2026 to announce its financial and operating results for the quarter ended March 31, 2026. The company furnished a press release titled "T-Mobile Delivers Continued Durable Postpaid Account and ARPA Growth, Translating to Best-in-Class Financial Growth, Raises Guidance" and an accompanying Investor Factbook as Exhibits 99.1 and 99.2. The filing (Item 2.02) reports results of operations and financial condition; the document was signed by CFO Peter Osvaldik.

Key Details

• Filing date: April 28, 2026; quarter covered: quarter ended March 31, 2026.
• Press release: Exhibit 99.1 — title indicates postpaid account and ARPA growth and that the company raised guidance.
• Investor materials: Exhibit 99.2 = Investor Factbook for Q1 2026; interactive XBRL cover page provided as Exhibit 104.
• Form 8-K item referenced: Item 2.02 (Results of Operations and Financial Condition); signed by CFO Peter Osvaldik.

Why It Matters
This 8-K gives investors the company’s latest quarterly results and management’s updated outlook (guidance), which are key inputs for assessing near-term revenue and earnings expectations. The press release and investor factbook provide the official figures and operating metrics (postpaid accounts, ARPA) that analysts and retail investors use to evaluate growth and compare against prior guidance or consensus estimates. The furnished XBRL and investor materials make it easier to extract the financial data for modeling and analysis.