U.S. stocks experienced a significant downturn today, with the Dow Jones Industrial Average falling by 650 points. The S&P 500 index dropped by 1.5%, marking its first such decline in over 18 months. The S&P 500 was down 1.2% and 1.3% at different points in the day. The NASDAQ 100 also fell by 1.01%. Only 17 stocks in the S&P 500 remained in positive territory. The S&P 500 Banks Index saw a notable decline of 2.4%, following a nearly 3% drop in the previous session. Technology was the only sector to perform relatively better, down less than 1%, preventing the S&P 500 from falling closer to 2%.