T-Mobile US, Inc. (TMUS) Sep 2025 Filing Analysis

Management expects to continue offering and expanding fiber services through the Lumos and Metronet platforms. — target: No explicit forward customer or penetration target disclosed

Wholesale revenue contracted materially year to date, although the latest quarter briefly improved. The year-to-date decline was driven by lower MVNO revenue, including DISH and TracFone, and by the Ka’ena acquisition ending a prior wholesale relationship. Advertising revenue from Vistar and Blis partly offset the decline, changing the nature of this stream. (1 shifted)

The UScellular acquisition closed on August 1, 2025. Integration and restructuring costs reached $73 million in Q3 and $120 million for the first nine months, versus $16 million in the prior-year nine-month period. Management expects integration activities and substantially all related cash costs to continue through fiscal 2027, while targeting $1.2 billion of annual run-rate synergies. The later baseline showed costs increasing sharply to $195 million in Q2 2026 and $830 million for six months, so execution risk intensified materially. (4 intensifying)

Total debt increased to $84.2 billion at September 30, 2025 from $78.3 billion at year-end 2024. Nine-month interest expense rose 7% to $2.8 billion, and the effective interest rate increased to 4.1% from 4.0%. T-Mobile issued $8.3 billion of debt during the period, including $1.7 billion assumed through the UScellular transaction. The later baseline showed debt still near $84.6 billion and interest expense rising faster, so the risk intensified modestly. (4 intensifying)

Cash and cash equivalents declined to $3.3 billion at September 30, 2025 from $5.4 billion at year-end 2024. Although nine-month operating cash flow increased 27% to $21.3 billion and adjusted free cash flow increased 7% to $13.8 billion, investing used $15.1 billion and financing used $8.3 billion. The company also spent $7.5 billion on buybacks and $3.0 billion on dividends. The later baseline showed cash falling further to $2.8 billion while capital returns and debt repayments remained substantial, so liquidity risk intensified. (4 intensifying)

In Q3 2025, T-Mobile spent $2.6 billion on property and equipment, $1.6 billion on spectrum and intangible assets, and $3.1 billion on investments in unconsolidated affiliates, principally Metronet. For the first nine months, property and equipment spending was $7.5 billion and joint-venture investment was $4.1 billion. The later baseline continued to show substantial network and spectrum spending, so the capital-intensity risk remained high and broadly stable. (2 stable, 2 intensifying)

Postpaid ARPA rose 3% year over year to $149.44 in Q3 2025 and 4% for the first nine months, supported by fee changes, plan optimization, premium plans, and more customers per account. However, management explicitly said increased promotional activity and bundled offerings partly offset the benefit. The later June 2026 baseline still showed only modest 2% ARPA growth and continued promotional pressure, indicating the risk remained material and broadly stable to slightly worse. (1 stable, 2 intensifying)