Jensen Huang Vouched for CoreWeave. The Next Day, Its Stock Fell 12%.

Nvidia CEO Jensen Huang told Bloomberg in Stockholm on Thursday, October 15, that CoreWeave's "strength is improving every day" and that Nvidia does not need to backstop the AI cloud company. On Friday, CoreWeave stock fell nearly 12%, finishing a week in which it lost about a quarter of its value, and the Nasdaq Composite closed down 2.1% at 26,140 to cap its worst week since June. The trigger wasn't weak AI demand. It was AI debt: investors spent the week asking whether the companies borrowing tens of billions to build data centers can pay it back with 10-year Treasury yields sitting near 5.1%.

The Week in Numbers

The Nasdaq fell about 4.5% for the week, according to CNN and Investing.com. The S&P 500 lost roughly 2%, while the Dow actually rose 0.7% as money rotated into defensive stocks. Both the S&P 500 and the Nasdaq had hit record highs only about ten days earlier.

Chips took the worst of it. The Philadelphia Semiconductor Index dropped 11.4% in five sessions, its worst week since April 2025, and Friday was its eighth straight daily decline. On Friday alone, AMD fell 6%, Intel 5.8%, Micron 5.6% and Broadcom 4.5%, per CBS News. Memory names got hit twice, once by the debt worries and once by China's CXMT: Micron lost 14.6% on the week, Samsung 17.8% and SK Hynix 24.3%, following the DRAM claim that already knocked Korea's Kospi earlier in the week. The Kospi ended the week down 14.5%, its worst since 2008.

Fear showed up everywhere. The VIX jumped more than 20% to around 20, and Brent crude touched $110 a barrel for the first time since May after Iranian attacks on ships in the Strait of Hormuz.

Why CoreWeave Became the Lightning Rod

CoreWeave rents Nvidia GPUs to AI labs, and it pays for its data centers largely with borrowed money. The Next Web, citing Bloomberg data, put its total debt at about $30 billion in June, roughly triple a year earlier and rated speculative-grade, against a backlog of $99.4 billion and a 2026 capital spending budget of $31 billion to $35 billion.

The credit market started worrying before the stock market did. CoreWeave's five-year credit default swaps rose to an intraday record of 1,194.5 basis points on October 15, per ICE Data Services, a level that prices in more than a 60% chance of default within five years. In June, the same contracts traded at 452. CNN reported that CoreWeave's bond yields have climbed to levels that signal distress, and Investing.com said its bonds hit new lows in secondary trading.

Then came the twist. Huang, whose company is CoreWeave's second-largest shareholder with about 10% and also its chip supplier, went on Bloomberg to say the opposite: that CoreWeave's "cost of capital is actually decreasing." The stock bounced on Thursday. On Friday it gave all of that back and more. CoreWeave is now down more than 65% from the peak it hit shortly after its March 2025 IPO, according to CNN.

Nebius, another neocloud, fell 12.2% on Friday. A Gartner report cited by Investing.com predicts that by 2030, 80% of neocloud providers will stop operating independently.

"The Subprime Tranche of the AI Trade"

The sharpest line of the week came from Gil Luria, head of technology research at D.A. Davidson. He told CNN that neoclouds are "the subprime tranche of the AI trade," which is why they're selling off first. His question is whether CoreWeave can earn enough return on its GPUs to repay what it borrowed for them.

Vital Knowledge's Adam Crisafulli made a similar point to CBS News: neoclouds fund their spending mostly through debt and new shares, not cash flow, so higher rates hit them directly. And rates are moving the wrong way. Consumer and producer price data both ran hot this week, the Fed already raised rates in September to a 3.75%–4% range, and CME FedWatch puts the odds of another hike in December at about 74%. Fed Chair Kevin Warsh declined to hint at the next move, saying he doesn't "prejudge meetings."

The AI labs themselves aren't immune. Reuters reported that some investors now discuss a $1.5 trillion valuation for Anthropic's planned IPO, down from a $2 trillion target, after its reported third-quarter revenue growth slowed from the quarter before. That's a mood shift from June, when OpenAI's trillion-dollar IPO filing set the tone for AI valuations.

The Case That This Is Just a Wobble

Not everyone is calling a top. Luria himself said AI demand is "real and growing"; his worry is the financing, not the customers. Jones Trading's Michael O'Rourke framed the fear more narrowly in comments cited by Investing.com: the market worries that 2026 "will mark the peak for earnings growth," not that AI is going away. Globalt's Thomas Martin summed up Friday more simply: "The market sells first, asks questions later."

The bigger picture also isn't a crash. The semiconductor index is still up more than 50% for the year even after falling over 20% from its June peak, and the Kospi is still up 35% year-to-date after its worst week since 2008.

What changed this week is who gets the benefit of the doubt. When compute was scarce, owning GPUs made you a landlord everyone wanted to rent from. With money costing 5% and a CEO's reassurance lasting less than a day, the market is now pricing the landlord's mortgage too. The Fed meets on October 27–28, and CoreWeave's bond prices will say more about the AI trade than any keynote before then.

Sources

• CNN via KION: Nasdaq sinks more than 2% as investors raise questions about AI debt
• CBS News: Tech stocks tumble as AI debt fears rattle Wall Street
• Investing.com: Nasdaq notches worst week since late June with a 4.5% slide as AI trade suffers
• The Next Web: Nvidia's Huang says CoreWeave needs no backstop, as its credit swaps hit a record