U.S. stocks ended October last week on a weak note, with the Nasdaq Composite plunging 5.2% for the month, its worst monthly performance since March 2025. The S&P 500 declined 1.2%, while the Dow Jones Industrial Average gained 1.5%. Technology and AI stocks bore the brunt of the sell-off as investors grew increasingly concerned about Big Tech's massive AI infrastructure spending, uncertain returns on these investments, elevated valuations and rising borrowing costs. Disappointing earnings and outlooks from major technology companies, including Amazon, Alphabet and Intel, intensified the pressure toward month-end, triggering a broader reassessment of AI-driven stock valuations.
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