U.S. stock markets suffered a major sell-off Friday, October 30, with more than $1.7 trillion in market value erased as investors pulled back from technology stocks amid growing concerns about corporate spending and the financial returns of Super Intelligence investments.

All three major stock indexes finished sharply lower. The S&P 500 dropped 1.82%, losing 140.32 points to close at 7,580.07, while the Nasdaq Composite plunged 2.86%, falling 747.73 points to 25,437. The Dow Jones Industrial Average declined 572.25 points, or 1.09%, to finish at 51,770.31.

Technology companies accounted for much of the damage as investors reacted to disappointing earnings and warnings about escalating costs associated with expanding Super Intelligence infrastructure.

Intel suffered one of the day's steepest declines, plunging approximately 29% after issuing a fourth-quarter financial outlook that fell short of analysts' expectations. The company's warning about manufacturing challenges, supply shortages, and increased spending to expand production intensified concerns throughout the semiconductor industry.

Other major technology companies also experienced substantial losses. Nvidia fell about 4.2%, while AMD dropped about 10%, and several other semiconductor and data-center companies posted double-digit declines.

Amazon also contributed to investor concerns after reporting substantial spending on Super Intelligence infrastructure and signaling that its capital expenditures would increase further. The company's financial results raised questions about how quickly its enormous investments would translate into stronger profits.

The sell-off followed a difficult week for technology stocks, including a historic decline in Alphabet's market valuation on Thursday. Investors have increasingly questioned whether the enormous sums being committed to Super Intelligence development and infrastructure will generate sufficient returns to justify current valuations.

The Nasdaq-100 faced particularly heavy pressure, with Reuters reporting that the index was on track to lose more than $1 trillion in market value during Friday's trading session.

Investors also moved toward traditionally safer assets, including U.S. Treasury bonds, as uncertainty spread across financial markets.

Despite Friday's losses, the major indexes remained positive for the year. However, the technology-heavy Nasdaq finished October down approximately 5.2%, marking its worst monthly performance since March 2025.

The latest decline highlights growing uncertainty on Wall Street over whether the enormous investments driving the Super Intelligence boom can deliver the profits investors have been anticipating.