The hyperscalers send their invoices this week

The week behind. On Thursday chip stocks had one of their worst days of the year, and the Nasdaq its worst day since June, as investors worried about the cost of financing the data-centre build-out¹. Dario Perkins of TS Lombard summed up the shift for CNBC: until recently the hyperscalers invested out of cash flow, but now “debt is now the marginal source of funding”³. On Friday technology shares steadied; the sector rose 0.35% while the wider market fell¹.

Two smaller stories with the same moral. American Express shares fell more than 3% after the company said it would cut about 5% of its global workforce, citing the need to “prepare for AI”². And telecoms fell hard: AT&T and T-Mobile both sank nearly 8% after a report that SpaceX was seeking thousands of cell sites for a fourth wireless carrier, while tower owners rose, Crown Castle by 9%¹. One story is about the claim that software replaces people; the other about a rocket company needing very ordinary steel masts on roofs. Both end in physical, countable things: payrolls and towers.

The week ahead. About a third of S&P 500 companies report, including Alphabet, Microsoft and Amazon, “three AI hyperscalers whose capital spending forecasts will be closely watched”, as Reuters put it¹. That line is the invoice of the whole AI economy. Chipmakers, power utilities, transformer makers, electricians: their order books are a share of it.

How to read them. Three numbers, in order. Capital spending, and whether it is rising or flattening. Operating cash flow, and whether it covers that spending. New debt, and at what rate. Revenue growth is the headline; the cash-flow statement is the story. A company can report record sales and still be borrowing to build.

The constructive reading. For two years the AI trade was priced on speeches. It is now priced on financing costs, which is a sign of a market growing up. Boring questions about who pays, from which account, at what interest rate, are the ones that keep a boom from becoming a bust. Nothing here is advice.