Why This One Number Matters For Comcast Investors
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Comcast (CMCSA) operates a fast-growing wireless phone business inside what most investors see as a cable company, and that may be what buyers at today’s price are betting on. You probably think of Comcast as a company losing internet customers, and in its latest quarter it was. Its stock returned 3.5% over the past year, against 12.8% for the S&P 500. Yet the wireless lines keep coming. So how big has Comcast’s wireless business become?
Comcast Serves 7% Of The Wireless Market Its Network Covers
Comcast ended fiscal Q3 2026 with 10.6 million wireless lines, up 18% from a year earlier. The business remains small against its market even as it grows, representing only about 7% of the wireless lines in the areas its network reaches. Those lines now reach nearly 18% of Comcast’s residential broadband customers.
On the October 22, 2026 call, management said Comcast has a long way to grow from that 7%. It also called the business capital-light, saying Comcast has no spectrum or towers of its own for it. That 7% is the one number to keep in mind, because it shows how much room the business still has.
Can Wireless Make Up For Comcast’s Broadband Losses?
Not yet. Comcast lost 144,000 broadband subscribers and added 368,000 net wireless lines in fiscal Q3 2026, and management said aggressive fiber promotions in some markets contributed to higher churn. Wireless service revenue grew nearly 15%, but the revenue Comcast tracks across broadband and wireless together still fell 2%. So far, wireless growth is softening that fall rather than reversing it.
One broadband measure is improving, though. Management said the year-over-year fall in revenue per broadband customer narrowed by 190 basis points from the quarter before, and it expects a further slight improvement in the fourth quarter. The company plans to sell more lines per household and more premium plans, which it says make customers much less likely to leave.
The share price appears to assume the broadband decline goes on. Comcast trades at 7.9 times its trailing twelve-month earnings, compared with 21.9 for the S&P 500. At the November 11 close, its $88.9 billion market value stood against $17.1 billion of free cash flow over those same twelve months.
What Would Show Comcast’s Wireless Push Failing?
Comcast gives many of its wireless lines away at first. Management said about half of its residential postpaid phone connects came from customers taking a free line, and Comcast now converts 70% of those free lines into paying relationships. If fewer free lines turned into paid ones, the line count could keep rising while wireless revenue did not.
The plan mix is improving, though. Premium unlimited plans made up about 40% of postpaid phone connects in fiscal Q3 2026, up from 30% the quarter before. Net wireless line additions and the revenue Comcast tracks across broadband and wireless together are the two figures to watch when Comcast reports its fourth quarter, expected in January 2027.
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