Key Highlights

● The Nasdaq Composite closed at 26,140.03 after finishing Thursday at 26,713.03.

● Debt-funded AI infrastructure names took the brunt as financing questions grew.

● All 30 PHLX Semiconductor Index members fell, and the index closed at 11,137.29.

● The Nasdaq Composite had its worst week since the week ended June 26.

A question of financing, not promise

The Nasdaq Composite carried the heaviest losses among the major U.S. benchmarks in Friday's session, closing at 26,140.03 after finishing Thursday at 26,713.03. The decline came as the market's long-running enthusiasm for artificial intelligence collided with a sharper focus on balance sheets. According to market reports, investors moved from asking what AI can do to asking how it will be financed, and debt-funded infrastructure names took the brunt of the selling.

The same reports said the rotation erased more than $1 trillion from semiconductor and AI-related stocks over the week. For the Nasdaq Composite, which is packed with chipmakers, cloud providers and software developers, that shift in mood translated into a broad and persistent slide.

CoreWeave at the center

CoreWeave (NASDAQ:CRWV) became the focal point of the anxiety. The AI cloud provider plunged to $61.39, according to market data, as attention fixed on a debt load that published reports put at more than $50 billion. Its notes due 2032 have traded below 80 cents on the dollar since they were issued in June, and the cost to insure the company's debt hit a record. One research firm cut its price target to $108 from $115.

BofA Securities' senior software analyst said: "First of all, this is more sentiment driven. This is not about fundamentals." He kept a Buy rating on the stock. Nvidia (NASDAQ:NVDA) chief executive Jensen Huang had defended the company on Thursday in Stockholm, telling reporters, "CoreWeave's financial strength is improving every day."

Other leveraged infrastructure names followed it lower. Nebius Group (NASDAQ:NBIS) plunged, and Applied Digital (NASDAQ:APLD) and IREN (NASDAQ:IREN) also tumbled, according to market reports.

Chips and software piled on

The selling spread well beyond the neocloud providers. Advanced Micro Devices (NASDAQ:AMD) sank, Intel (NASDAQ:INTC) tumbled and Micron Technology (NASDAQ:MU) slid amid worries about Chinese memory competition. All 30 members of the PHLX Semiconductor Index fell, market data showed, and the index closed at 11,137.29.

Software was hit late in the day. Palantir Technologies (NASDAQ:PLTR) tumbled and entered correction territory relative to its Oct 9 record, while Fortinet (NASDAQ:FTNT) and Datadog (NASDAQ:DDOG) slid. Meta Platforms (NASDAQ:META) fell amid concern over debt-funded AI spending, and reports on Nvidia were mixed, with sources differing on whether it ended lower.

One market commentator summed up the shift: "The AI group is now splitting between companies that can fund the buildout themselves and those that have to borrow."

A defensive rotation elsewhere

The damage was concentrated. The Dow Jones Industrial Average slipped just 175.28 points to 52,002.41, and the S&P 500 fell 84.62 points to 7,659.44. Energy, utilities and consumer staples gained as money moved into steadier sectors, helped by Brent crude climbing to $109.86. Treasury yields eased, with the 10-year yield near 5.1, but that did little to rescue growth stocks.

For the week, the Nasdaq Composite posted its worst performance since the week ended June 26, snapping a run of weekly gains. The VIX volatility gauge jumped 3.53 points to 19.99.

Nasdaq Awaits Big Tech Earnings Run

The Federal Reserve announces its next rate decision on Oct 28. Fed Chair Kevin Warsh said in Bangkok, "I don't prejudge meetings."

A senior market analyst said "upcoming Big Tech earnings will still need to demonstrate that the enormous investment in AI is translating." Big Tech earnings arrive next week, with Netflix (NASDAQ:NFLX) reporting on Tuesday, Oct 20, followed by Meta and Tesla (NASDAQ:TSLA) on Wednesday, alongside Lam Research (NASDAQ:LRCX) and Texas Instruments (NASDAQ:TXN).