Stock Market Today: Wall Street Sinks on AI Fears - STL.News

ST. LOUIS, MO – October 30, 2026 – The U.S. stock market experienced a significant downturn on Friday, driven by underwhelming corporate earnings forecasts, rising apprehensions regarding spending on artificial intelligence, and a pronounced selloff in semiconductor stocks. This led to all major indexes on Wall Street closing in the red on the last trading day of October.

The Nasdaq Composite dropped 2.86%, the S&P 500 fell 1.82%, and the Dow Jones Industrial Average saw a decrease of 572.25 points. Additionally, the Russell 2000, which tracks smaller publicly-listed companies, also ended the day lower.

Friday marked the S&P 500’s most substantial decline since June, while the Nasdaq recorded its largest one-day percentage drop since June 5, as reported by the Associated Press and Reuters.

Technology stocks were at the forefront of the market decline as investors expressed concerns over whether the significant investments in artificial intelligence infrastructure would yield returns sufficient to validate the high stock valuations. Intel's shares plummeted following poor financial guidance, and Amazon came under scrutiny after announcing high capital expenditures and negative free cash flow, despite reporting strong revenue growth and operating profits.

The selloff affected a wide range of stocks, with the number of declining issues greatly surpassing those that advanced on both the New York Stock Exchange and Nasdaq. Despite the heavy losses on Friday, all four major U.S. stock indexes remained in positive territory for the year.

The Nasdaq faced the steepest decline, reflecting intense selling across semiconductor companies, AI-focused firms, and other technology sectors. The S&P 500's downturn indicated that the weakness was not confined to the tech-heavy Nasdaq. The Dow Jones Industrial Average, which includes 30 major American corporations, fell by more than 570 points. Smaller companies were not spared either, as the Russell 2000 index decreased by 47.37 points.

Trading volume was notably high, with approximately 19.87 billion shares changing hands on U.S. exchanges, surpassing the average of 17.26 billion shares over the previous 20 trading sessions. This surge in volume signaled robust investor activity during the selloff.

Technology firms were particularly hard hit on Friday. Investors reacted to earnings reports from Intel and Amazon while reevaluating the financial implications of the industry's aggressive push into artificial intelligence. Companies involved in advanced computing have invested heavily in data centers, processors, networking gear, and other infrastructure, leading to expectations of significant future revenue growth. However, such spending puts pressure on cash flow, compelling companies to generate adequate financial returns over time.

The central question for investors remains whether the anticipated benefits of artificial intelligence justify the hefty investments involved. The latest earnings reports underscored this concern. By the end of Friday's trading, the Nasdaq had fallen approximately 7.8% from its record close on October 6, illustrating how swiftly investor sentiment can shift when financial results fall short of expectations.

Intel was one of the day's biggest losers, with its shares plummeting around 28.6%, marking the company's worst single-day performance since 1974. This decline followed Intel's announcement on October 29 regarding its third-quarter financial results and its outlook for the fourth quarter. The company reported third-quarter revenue of $16.5 billion, a 21% increase from the same period in 2025, with GAAP earnings of $0.60 per diluted share and non-GAAP earnings of $0.52 per diluted share. Intel's data center and AI segment generated $7.3 billion in quarterly revenue, a remarkable 78% year-over-year increase.

Despite these positive results, Intel's forecast for the final quarter of 2026 disappointed investors, as the company projected revenue between $15 billion and $16 billion and anticipated GAAP earnings of $0.10 per share and non-GAAP earnings of $0.25 per share. Management also warned of ongoing weakness in the personal computer market, potentially extending into the first half of 2027. This disappointing outlook overshadowed the company's stronger quarterly performance, demonstrating that investors often prioritize future expectations over past results.

The selloff was not limited to Intel; other semiconductor stocks were also under pressure. Nvidia shares dropped by 4.2%, and Advanced Micro Devices saw a decline of 10.9%. The Philadelphia Semiconductor Index fell around 7.2%, indicating widespread weakness across the sector. Semiconductor manufacturers have been closely monitored due to their critical role in artificial intelligence development, as advanced processors are essential for training and operating complex AI systems. However, the increasing demand for advanced computing does not mitigate the risks associated with investment in this sector.