According to CoinMeta, the market value of the S&P 500 index evaporated by approximately $3 trillion, and the U.S. stock market experienced a significant sell-off. The S&P 500 index, the Nasdaq, and the Dow Jones all recorded their largest single-day declines since April 3, 2025. The Nasdaq closed down 11.9% from its historical high on October 6, officially confirming entry into a technical adjustment period. The Philadelphia Semiconductor Index fell 12.5%, marking its largest single-day decline since March 2020.