T-Mobile US, Inc.

T-Mobile US, Inc. is an American wireless telecommunications and broadband provider that serves over 100 million postpaid and prepaid customers across the United States, generating $88.3 billion in total revenue in fiscal 2025. Majority-owned by Deutsche Telekom AG (which holds approximately 53% of the outstanding shares), T-Mobile has transformed from a distant fourth-place carrier into the second-largest U.S. wireless operator by subscribers, overtaking AT&T in postpaid phone customers in 2024 and now running neck-and-neck with Verizon for industry leadership by multiple metrics including service revenue growth, postpaid account additions, and network quality.

This is a story about widening differentiation. After closing the Sprint merger in April 2020, T-Mobile absorbed roughly 40 million new subscribers, integrated a vast mid-band spectrum portfolio, and executed one of the largest network integration projects in telecom history — all while continuing to grow the combined base. The result is a business whose network quality lead, measured by NPS of 45 (over 20% above the next competitor), translates directly into subscriber and financial outperformance. The central question this file turns on is whether that differentiation is durable enough to sustain industry-leading growth as competitors belatedly modernize their own 5G footprints, and whether the potential Deutsche Telekom combination — publicly speculated since April 2026 — enhances or distracts from the operating story.

The file is also about capital allocation at scale. T-Mobile generated $28.0 billion in operating cash flow in FY2025 and $18.0 billion in free cash flow, a dramatic inflection from the cash-burning network build years of 2020-2022. The company returned $6 billion to shareholders in the first quarter of 2026 alone through dividends and buybacks, and the Board authorized up to $18.2 billion in total 2026 stockholder returns. Whether the market fully appreciates the durability of this cash flow stream is a live debate that shapes the valuation discussion below.