Nasdaq Hits a Three-Month Low as Intel's 29% Plunge Deepens the AI Spending Reckoning

Wall Street closed October 2026 with a rout. On Friday, October 30, the Nasdaq Composite fell 2.86% to 25,437.00, its lowest finish since July 31, while the S&P 500 dropped 1.82% to 7,580.07 and the Dow Jones Industrial Average fell 1.09% to 51,770.31. The Nasdaq-100 fell harder still, down 3.46% to 28,384.85, and the Philadelphia Semiconductor Index plunged 7.20%. It was the market's worst single-day drop since June for the S&P 500, and it capped a month in which the Nasdaq fell 5.2% — its steepest monthly decline since March 2025 — while the S&P 500 lost 1.2% for October and the Dow managed a 1.5% gain.

Intel set the tone

The trigger was Intel. The chipmaker plunged about 28.6% to 29% on October 30 after issuing a downbeat outlook for the current quarter, citing slowing PC demand, with revenue in its client computing and physical AI division falling 5% year on year to $8.1 billion. It was Intel's biggest single-day percentage drop since 1974. The damage spread through semiconductors: Nvidia fell about 4.2%, Advanced Micro Devices dropped roughly 10.9%, and server and chip suppliers fell with them. Amazon also faced selling pressure after weaker-than-expected third-quarter results and a large artificial-intelligence spending plan, while Reddit plunged around 29% despite reporting a 53% rise in third-quarter revenue to $895 million, after its forecast disappointed. Alphabet, which had already suffered its worst day ever on Thursday, fell again on Friday. The common thread was not earnings alone — several companies beat on the quarter — but what the market thought about the spending behind them. Investors have spent months asking whether the hundreds of billions going into AI infrastructure will generate matching returns, and on October 30 they answered, for one day at least, with selling. Technology stocks lost more than $1 trillion in market value in the session, according to market reporting, and the technology sector fell 4.89% while defensive sectors — energy, staples and utilities — held up better. Energy rose 1.91% on the day, helped by higher oil prices.

Why the index divergence matters

The gap between the Nasdaq-100's 3.46% fall and the S&P 500's 1.82% fall is the most important feature of the session. It shows how concentrated the selling was in large technology and growth companies, which dominate the Nasdaq-100, while the average stock fared better: the equal-weight S&P 500 ETF fell only 0.79%. For the week, the S&P 500 lost 0.6%, the Dow fell 0.9% and the Nasdaq lost 2%. That pattern — headline indices down more than the average stock — is what a rotation away from mega-cap tech looks like, rather than a uniform panic. It also explains why healthcare and energy earnings, including Regeneron and ExxonMobil, were rewarded on the same day tech was punished: the market was not rejecting all earnings, it was rejecting one specific story, AI spending without matching cash flow. The bond market told a calmer story. The 10-year Treasury yield slipped 4 basis points to 4.94% as stocks sold off, despite hawkish Federal Reserve talk, and later reports put the yield near 4.93%. Bonds attracting buyers during an equity sell-off is a normal flight-to-safety pattern, not a sign of a credit crisis. The Chicago Business Barometer, meanwhile, declined 3.5 points to 55.3 in October but remained in expansion territory above 50 for a second month, with new orders and backlog cited as the reason for the decline.

What to watch next

First, whether the sell-off broadens or stays concentrated in tech. A second day of equal-weight outperformance would confirm rotation; a broadening decline would suggest something worse. Second, the earnings calendar: Apple and Palantir were scheduled to report on Monday, followed by AMD, Pfizer and Amgen on Tuesday, and those prints will test whether the AI-spending question spreads to the companies still standing. Third, the macro data: Thursday's data had already shown third-quarter GDP growth of 3.4%, above the 3.2% forecast, and core PCE inflation edging up to 3.1%, hardening the case for a possible December rate hike — the backdrop that makes expensive growth stocks harder to own. For index investors, the practical lesson is about concentration. An index is not the market; it is a weighted list, and when a handful of names dominate it, a single earnings season can move the whole index more than the economy warrants. That is not a reason to abandon index investing, but it is a reason to know what you own, and to notice when the equal-weight version of the same index tells a different story from the headline number.

FAQ

How far did the major indices fall on October 30, 2026? Nasdaq Composite down 2.86% to 25,437.00, S&P 500 down 1.82% to 7,580.07, Dow down 1.09% to 51,770.31, Nasdaq-100 down 3.46% to 28,384.85.

Why did Intel fall so sharply? Intel fell about 28.6% after a downbeat quarterly outlook citing slowing PC demand; its client computing and physical AI division revenue fell 5% year on year to $8.1 billion.

Was the sell-off only about tech? Mostly, yes. Technology fell 4.89% while energy rose 1.91% and defensive sectors held up, and the equal-weight S&P 500 fell only 0.79% against the headline index's 1.82% drop.

What happened to the indices over October as a whole? The Nasdaq fell 5.2% for October, its steepest monthly decline since March 2025; the S&P 500 fell 1.2% for the month; the Dow gained 1.5%.

What should investors watch next? Whether selling broadens beyond tech, upcoming earnings from Apple, Palantir and AMD, and macro data that could affect the December rate-hike debate.

Read more market coverage at https://zimbuck.com/pages/zimbucknews and join the discussion at https://zimbuck.com/groups/zimbuckmarketnews — and see our earlier earnings coverage at https://zimbuck.com/blogs/543/Leveraged-XRP-Bitcoin-Ether-and-Solana-ETFs-Delayed-to-November . This article is market news and general information only, not financial advice.