AT&T sold more in the third quarter of 2026 and kept far less of each dollar

Revenue went up and the margin went the other way

AT&T, the American telecom operator that sells mobile and fixed broadband services, booked USD 32.3bn in revenue in the third quarter of 2026. That is up 5.3% from USD 30.7bn in the same quarter of 2025. The figures are consolidated, so they cover the whole group, in US dollars under US GAAP, the American accounting rules. For a mature operator, that is a respectable quarter.

Operating profit moved the opposite way. It fell 33.1%, from USD 6.1bn to USD 4.1bn. The operating margin, the share of each dollar of revenue left after running the business, narrowed from 19.9% to 12.7%. Revenue grew by USD 1.6bn. Operating profit shrank by USD 2.0bn.

So the group became larger and markedly less profitable per dollar sold, in the same quarter. That is the tension worth explaining.

The squeeze sits above the depreciation line

In telecoms, the usual suspect for a falling operating margin is depreciation. Networks are expensive, they are written off over many years, and a new wave of investment can drag operating profit down while day-to-day costs stay flat. That is not what happened here. Depreciation and amortisation fell, from USD 5.3bn to USD 5.0bn.

EBITDA, which is operating profit with depreciation and amortisation added back, tells the same story as the operating line. It fell 20.7% to USD 9.1bn, and the EBITDA margin narrowed from 37.2% to 28.1%. The pressure is in the costs of running the business that quarter: staff, network operations, handsets, marketing, customer retention and any one-off charges booked inside operating costs.

When a margin shrinks while revenue grows, the usual causes are few and familiar. One is mix. In a telecom business, selling a handset brings in revenue at a thin margin, while a service subscription carries a much fatter one. A quarter heavy on device sales can lift revenue and dilute the margin at the same time. Another is price. Promotions, discounts and subsidised phones win or hold customers, and they show up as revenue that earns less. The last is cost: wages, energy or restructuring charges that rose faster than the company could raise prices.

The quarterly totals do not split revenue between services and equipment, nor do they isolate one-off charges. The figure that would settle it is the service margin by segment. Until that is clear, I would not decide which cause is at work.

The competitive backdrop makes the price explanation plausible. Kurzy.cz reported in October 2026 that SpaceX bought US spectrum licences to build out Starlink Mobile, a potential new rival to AT&T, Verizon and T-Mobile. Later that month the same publisher reported that AT&T beat analysts' expectations on revenue and profit and raised its full-year profit outlook, while its shares fell, with Starlink named as the threat. A new competitor usually shows up first in retention spending and promotions, long before it shows up in lost customers.

The net profit collapse says more about last year

Net profit fell 90.4%, to USD 891m from USD 9.3bn, and the net margin dropped from 30.3% to 2.8%. That looks dramatic, but the base is unusual. A year earlier, net profit of USD 9.3bn was larger than operating profit of USD 6.1bn. When a company earns more at the bottom line than from its operations, something outside the core business lifted the result, such as a gain on a sale or an investment. That kind of gain does not repeat every quarter.

I would not build the story on the net profit line. It mostly measures the absence of last year's windfall. The operating line is the cleaner test, and it still shows a real squeeze.

The balance sheet moved too. Cash fell 46.9% to USD 10.8bn, and the equity ratio, equity as a share of total assets, slipped from 30.0% to 27.5% as total assets grew to USD 446bn. I would keep an eye on the cash line, but neither change alters the main point: the extra revenue this quarter came with a lower return.

What to check in your own company

The same pattern hides easily in a smaller business, because a growing top line feels like good news and nobody asks what the growth cost.

Take the revenue you added over the past year: new customers, new products, new contracts. Put it in a separate column from the revenue you already had. Then assign the direct costs to each column: discounts, the cost of goods, commissions, the extra staff hired to serve it. Work out the margin on each column.

If the new column earns a visibly thinner margin, you have found where your growth was bought. Then ask your finance team a single question: was that discount a launch incentive to win the customer, or is it now the price? A launch discount that lapses is an investment. A discount written into a renewal is a permanent cut to your margin.

Finally, compare your headline margin this year with last year. If it fell while revenue rose, do not accept "we grew" as the explanation. Growth explains revenue. It does not explain margin.

AT&T's quarter shows that revenue and profitability are separate reports. Revenue went up by 5.3%, the operating margin went down by 7.3 pp, and only the second says what each new dollar is worth.