For a decade, T-Mobile US, Inc. (NASDAQ:TMUS) has been one of the most preferred stocks in the telecom industry. However, on August 14, 2026, Wolfe Research’s Peter Supino cut the stock’s rating from Outperform to Peer Perform, and the shares declined. As Supino questions both TMUS’s growth story and the cash-return story, the downgrade gives bulls some reason for caution.
Competition Is Back in the Core
T-Mobile’s second-quarter print reported July 23, 2026, provides some support for Supino’s first argument that
Long-term revenue growth forecast risk tilts negatively as competition expands in T-Mo’s core.
Postpaid net account additions stood at 277,000 – a 13% decline from 318,000 a year earlier. Also, management expects third-quarter postpaid net account additions of approximately 250,000 as rate-plan modernization temporarily elevates account churn. Postpaid phone churn was 0.85% in Q2, with management saying the impact on phone churn should be smaller because the modernization is concentrated in accounts with fewer lines
The Capex That Could Pressure Buybacks
The second argument targets cash returns. Supino warned that
Broadband and 6G investments could dampen capital returns and pressure leverage
TMUS’s capital expenditure in the second quarter went up by 12.8% to $2.70 billion. Wolfe’s concern is that additional broadband and eventual 6G investment could raise capital requirements over time, leaving less room for shareholder returns. These returns hold for now. Repurchases during the quarter reached $2.2 billion in shares, and the adjusted free-cash-flow guidance was raised to $18.4–$18.8 billion. So, the risk is not this cycle, but the next one. SpaceX’s Starlink, on August 5, 2026, detailed a direct-to-consumer mobile service launching in late 2027. This challenges T-Mobile’s moat narrative, although the carrier already partners with SpaceX through T-Satellite and is also part of the proposed three-carrier satellite joint venture announced in May.
The Premium and the Cushion
T-Mobile is trading at approximately 16.70 to 16.86 times forward earnings – comparatively higher than AT&T’s 9.8x-10.7x range and Verizon’s 9.2x-9.6x range. This is a premium that is easier to justify only if its growth surpasses its competitors. Positioning still leans long, though: Insider Monkey recognizes an increase in hedge funds holding TMUS between Q4 2025 and Q1 2026 from 76 to 85. Short interest sits low near 3.8% of float as of late July, meaning that the vast majority of the market is not betting against the stock.
Bottom Line
The moat is still intact, but the pillars that supported T-Mobile US, Inc. (NASDAQ:TMUS), are beginning to face pressure, while higher future broadband and 6G investment could eventually constrain capital returns. The third quarter print is an important test, and this rate-plan modernization quarter will serve as the near-term referee on the company’s competitive position. Investors may want to wait for either stronger growth evidence or some narrowing of T-Mobile’s premium to peers.
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