Tech-Heavy Stock Index Falls Into 'Correction' After Biggest One-Day Drop in 19 Months

The Nasdaq Composite, an index tracking many tech-heavy US stocks, closed sharply lower Thursday, November 5, 2026. It posted its biggest one-day drop in 19 months and entered "correction," meaning down at least 10% from a recent high. Chip makers sank on fears of stricter AI rules. Investors in broad index funds also hold those chips, in smaller amounts.