U.S. stocks extended their decline on October 31, 2024, with the S&P 500 falling 1% and breaking last week's low. The Nasdaq 100 also saw a decline, dropping 1.04%. Notably, NVIDIA's losses widened to 3%. The market opened with the S&P 500 down 0.8% and the Nasdaq 100 down 0.9%, continuing to slide as the day progressed.