The week the lenders stopped taking the bribe
The AI build-out runs on borrowed money, the lenders have just raised their price for it, and the stock market has started to sort the borrowers from everyone else.
The Nasdaq, the stock index heaviest in technology, fell 4.5% this week, its worst week since June. CoreWeave, which borrows to build data centers and rents out the chips inside them, fell 12% on Friday and 25% on the week. The VIX, the market's gauge of how much turbulence traders expect, closed at 19.99, up 35% over five sessions (under 20 counts as calm). And the interest rate the US government pays to borrow for ten years fell by 0.146 percentage points to 5.097%, its biggest weekly fall since mid-February, before the Iran war began (WSJ).
Those last two facts belong together. For three weeks the story was a jump in interest rates pushing the government's borrowing cost to its highest in 26 years. This week the fear changed shape: investors worried that those rates would choke the AI investment that has been carrying the economy, and money ran back into government bonds, which is where it goes when people are scared. The protection worked. The thing it was protecting against got worse.
What changed since Thursday is how far the selling spread. The New York Times puts CoreWeave's debts at $72bn across 51 data centers, with the market pricing a better-than-60% chance it fails to pay them, and the damage is no longer confined to one company: Oracle's bonds have fallen, the cost of insuring SoftBank's debt against default is rising, and Barclays says the extra interest investors demand to hold risky AI debt has risen by more than 50% in six months. Oracle is also struggling to get state permits for the power its New Mexico data center, Project Jupiter, needs (NYT). It is global, too. China's Star50 index of technology shares is down nearly 40% this half-year, and the chipmakers MetaX and Moore Threads have roughly halved, in a market where shares are 'the default source' of AI funding (Bloomberg).
The mechanism is the one Ben Inker of the fund manager GMO describes: 'You've got to bribe the lenders that much more to take more data center risk.' The newer AI cloud companies, the so-called neoclouds, borrow against their chips and customer contracts, and once their bonds pay 15% the next round of building has to be paid for by selling shares, just as Anthropic and OpenAI prepare to sell shares by the bucketload. Look at the split among the companies we track: Applied Digital and IREN are down 36% and 42% over 20 days, while Microsoft is 2.7% off its high. The market is not yet pricing a bust. It is pricing who has to borrow to stay in the game. That is more tinder on the pile, not a spark, but it is the kind of pile that turns a small fire into a large one.