AI-generated · cited to primary sources · not investment advice
T-Mobile US, Inc. (TMUS) Dec 2025 Filing Analysis
What could break the thesis?
T-Mobile invested $932 million in Lumos and $4.6 billion in Metronet during 2025 for 50% interests and fiber customers. Management recognized its share of Lumos and Metronet losses in other expense and expects an additional $500 million Lumos contribution in 2027-2028. The filing provides evidence that the fiber strategy is capital-intensive and not yet proven profitable. The later baseline continues to identify losses and adds approximately $2.7 billion of planned investments in other fiber ventures, so the risk intensified. (2 intensifying)
“During the three months ended September 30, 2025, we invested $4.6 billion to acquire a 50% equity interest in the joint venture and 713,000 residential fiber customers.”
Postpaid ARPA increased 4% to $148.97 in 2025, but postpaid phone ARPU rose only 2% to $50.37, while prepaid ARPU fell 5% to $34.14. Management said ARPA and phone ARPU benefited from rate-plan optimization, higher fees, premium plans, and tax- and fee-exclusive plans, but were partly offset by increased promotions and bundled offerings. The later baseline shows ARPA growth slowing to 2% in Q2 2026 and 3% for the six months, indicating that the pricing-risk trajectory worsened after this filing. (2 intensifying)
“Postpaid ARPA increased $5.12, or 4%, primarily from ... rate plan optimizations and higher fee revenue ... Higher premium services ... partially offset by ... Increased promotional activity, including the success of bundled offerings.”
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