Short answer
Investors reacted less to sales than to cash: Alphabet and Amazon reported fast cloud growth, but their spending on data centres and chips outran the cash their businesses produced, and Intel gave a weak forecast. On Friday, October 30, the Nasdaq fell 2.9%, its largest one-day percentage drop since June 5.
Follow-up question What numbers should you watch next?
This was the week many of the largest AI spenders reported results. On paper, much of the news looked very good. Google Cloud revenue roughly doubled, and Azure and Amazon Web Services both grew quickly. Yet by Friday's close, the Nasdaq Composite was down 7.8% from its record close on October 6, and the main chip stock index had lost more than 15% for the month, Reuters reports.
The explanation lies in two terms that most AI news skips over. Here is what happened, in order, and how to read it. This article explains the news; it doesn't recommend buying or selling anything.
The two numbers that drove the week
Capital expenditure, or capex, is money spent on long-lasting things, such as data centres, servers and chips. The spending happens now, and the income is expected to come over years.
Free cash flow is the cash left after that spending: the cash the business generates from operations, minus capex. A company can report a large accounting profit and still have negative free cash flow, because accounting spreads the cost of a server over several years while the bank account pays for it right away.
| Company (quarter ended Sept. 30) | Cloud growth | Cash from operations | Capex | Free cash flow |
|---|---|---|---|---|
| Alphabet | Google Cloud +103%, to $30.7B | $42.3B | $51.4B | ($9.1B) |
| Amazon | AWS +39%, to $46.0B | $42.4B | $77.3B | ($42.4B) over 12 months |
| Microsoft | Azure +48% | $58.0B | $39.4B in cash | About $18.6B |
| Meta (reported Oct. 21) | No cloud business | $32.8B | $34.9B | ($2.1B) |
Definitions vary, so these rows are not perfectly comparable. Microsoft's cash-flow statement lists $39.4 billion, and CNBC reports $45.2 billion once finance leases are included. The Microsoft free cash flow figure is our subtraction, and Amazon reports free cash flow on a 12-month basis after counting sale proceeds. The releases for Microsoft and Meta are public filings.
The week, day by day
Monday, October 26. Anthropic filed its IPO document, a rare look inside a leading AI lab, with very fast revenue growth alongside large losses.
Wednesday, October 28. Alphabet and Microsoft reported after the market closed. Alphabet's capex more than doubled from a year earlier, and this was its second straight quarter of negative free cash flow. On its earnings call, Alphabet said a $5.2 billion payment for a European fine and an inventory build also weighed on cash, and that it expects capex to rise significantly in 2027 from a 2026 range of $195 billion to $205 billion. Microsoft targets more than $50 billion of capex next quarter, but its operating cash more than covered this quarter's bill.
Thursday, October 29. Alphabet shares fell about 13%, according to Morningstar, while Microsoft traded higher in the morning. Heavy spending at both, opposite reactions: cash coverage appears to have been a big part of the difference, along with an earnings miss at Alphabet. After the close, Amazon and Intel reported.
Friday, October 30. Amazon missed expectations, by Morningstar's account, while keeping its 2026 capex forecast at about $220 billion. Its 12-month free cash flow went from an inflow of $14.8 billion a year earlier to an outflow of $42.4 billion. Intel forecast fourth-quarter revenue of $15 billion to $16 billion, which Morningstar says missed an estimate of about $17 billion. Intel's quarter beat its own guidance and its CEO pointed to headwinds in PCs, so this was not purely an AI story. Sources differ on the size of its fall, with Reuters at 28.6% and Morningstar at 31%.
The damage spread along the supply chain:
| Stock or index | Friday, October 30 |
|---|---|
| Nasdaq Composite | -2.86%, to 25,437 |
| S&P 500 | -1.82%, to 7,580 |
| Chip stock index | -7.2% |
| Nvidia | -4.2% |
| AMD | -10.9% |
| Dell / HP | -10.8% / -9.6% |
| Amazon | -5.6%, per Morningstar |
What investors seem to be asking
Oliver Pursche of Wealthspire Advisors told Reuters the week was about the future of AI: whether there would be a positive return on the investment, and how fast. That is the central question. A data centre built today has to earn its cost back over years.
Two readings are both reasonable:
- Worried: companies are spending ahead of proven returns, and some are raising outside money to do it.
- Unworried: cloud sales are growing at remarkable rates, Microsoft's CFO says demand still exceeds supply, and capacity has to be built before it can be sold. S&P 500 earnings overall are expected to grow 31.6% for the quarter, per LSEG data cited by Reuters.
One week of prices can't settle that. A sharp fall doesn't prove a bubble, any more than a record high proves the opposite.
Try it: Pick any company above and find its latest earnings release. Search for "operating activities" and "property and equipment", then subtract the second from the first. You've just calculated a rough free cash flow.
What numbers should you watch next?
Three simple ones. First, capex against cash from operations: when the first is above the second, a company has to fund the gap from savings, debt or new shares. Alphabet disclosed a stock sale during the quarter, for example. Second, cloud growth compared with capex growth, which shows whether the spending is turning into sales. Third, what companies say about next year: Alphabet has signalled a large rise, and CNBC reports that Microsoft targets $170 billion for calendar 2027.
Meta has narrowed its 2026 capex range to $135 billion to $145 billion. Changes in ranges like that one tell you what companies plan to do, which often says more than how traders felt on a Friday.
Sources
- Wall Street closes sharply lower as AI cash burn fears spark tech selloff — Reuters, via Yahoo Finance, October 30, 2026
- Alphabet Q3 2026 earnings release (Exhibit 99.1) — Alphabet / U.S. SEC, October 28, 2026
- Amazon Q3 2026 results (Exhibit 99.1) — Amazon / U.S. SEC, October 29, 2026
From the Guide to Artificial Intelligence, by Robert Scales, published by Holistic Hybrid Inc. Share and adapt it under CC BY-NC-SA 4.0: credit the guide, link to https://guidetoartificialintelligence.com/en/learn/why-ai-stocks-fell-spending-week-october-2026/, no commercial use without permission, and keep the same licence.