What happened

Investors turned on the AI spending boom on Friday. The Nasdaq fell 2.9%, chip stocks dropped sharply, and the biggest tech companies in the US saw billions wiped off their market values in a single session.

Nvidia fell 4%, Broadcom dropped more than 5%, and Qualcomm fell 11%, according to TechCrunch. Alphabet, which had already suffered its worst day on record on Thursday with a 12% plunge, fell again on Friday.

The sell-off followed two weeks of earnings reports in which Alphabet, Amazon, Meta and Microsoft outlined plans to spend more than $740 billion on capital expenditures this year. Wall Street reads most of that spending as AI infrastructure: data centers and chips.

Earlier in the boom, investors rewarded big spending as a sign of confidence. That mood has flipped. As the fourth quarter begins, the worry is negative free cash flow, rising debt, and whether these enormous bets will ever pay for themselves.

Why it matters

The numbers behind the worry are stark. Free cash flow is the cash a company has left after paying for its operations and equipment. When it turns negative, a company is spending more than it brings in.

Alphabet reported negative free cash flow of $9.1 billion in the third quarter, its second straight quarter in the red, even as quarterly capital spending reached $51.4 billion. The company expects to spend up to $205 billion this year, with spending rising again in 2027. Its slide followed [Alphabet's $500 billion drop](/article/google-loses-500-billion-ai-search-ad-revenue) a day earlier, when its own AI search product hit its advertising business.

Amazon reported negative free cash flow of $42.4 billion over the past 12 months, compared with $14.8 billion in positive free cash flow the year before. It expects to spend $220 billion this year. Its cloud business, AWS, grew revenue 39%, yet the stock still fell 7% after earnings on Thursday.

Meta reported negative free cash flow of $2.1 billion in the third quarter as capital spending outpaced its operating cash. It is guiding to as much as $145 billion in spending this year. Advertising revenue grew 26%, but the stock still took a 10% hit last week. Chief executive Mark Zuckerberg has said Muse, Meta's new free personal AI agent, is very compute-intensive to run.

Microsoft was the exception. It posted $18.6 billion in positive free cash flow, with capital spending of $45.2 billion, below the $50 billion it had projected. The company blamed delays in capacity from third-party providers, and shares of smaller companies that rent out AI computing power fell on the news.

The money is not only coming from profits. Microsoft, Alphabet, Amazon, Meta and Oracle raised a combined $326 billion in debt in 2026, according to S&P Global Market Intelligence, triple the amount raised last year.

That matters beyond Wall Street. These companies drive a large share of US stock market gains, and their spending shapes jobs in data center construction, chip manufacturing and cloud engineering across the US. When investors question the payoff, hiring and expansion plans can slow with it.

What happens next

Demand for AI computing is still strong. Google, Amazon and Microsoft all reported gains in their cloud businesses. The question investors are now asking is not whether customers want AI, but what it costs to serve them.

Anthropic's planned IPO is the next test. The AI company filed to go public earlier this week, and its growth depends on securing enormous amounts of computing power. The Financial Times reported Friday that Blackstone has warned investors the company might not qualify for an investment-grade rating after its IPO, which would leave it more reliant on the big cloud providers and other funders to pay for its infrastructure. RoboVez previously reported on [Anthropic's IPO terms](/article/anthropic-ipo-leaves-public-investors-little-control) and on [Microsoft's $10 billion quarter from OpenAI](/article/microsoft-made-10-billion-from-openai-one-quarter).

Watch the next round of capital spending guidance from the big four. If spending keeps climbing while free cash flow stays negative, expect more rough days for tech stocks. If cloud revenue growth starts covering the bill, the mood could turn just as fast.