US equities experienced significant declines on Friday, as recent technology company earnings reports amplified anxieties surrounding substantial investments in artificial intelligence. The Nasdaq Composite declined 2.86% and the S&P 500 decreased 1.82%, marking their steepest single-day drops since June. The Dow Jones Industrial Average retreated by 572 points, equating to approximately 1.1%. This recent downturn has eroded gains from prior record levels; the Nasdaq has retraced 7.8% from its peak and registered its largest monthly contraction since March 2025. The S&P 500 has also diminished roughly 3% from its high. US stocks registered considerable losses last week in the wake of earnings releases from Amazon and Alphabet. During October, the Dow Jones Industrial Average advanced 1.5%, whereas the Nasdaq and S&P 500 retreated 5.2% and 1.2%, respectively.