According to Deep Tide TechFlow, on May 21, the U.S. stock market opened with the Dow Jones Industrial Average down 367.17 points, a decrease of 0.86%, at 42310.07 points. The S&P 500 index fell by 39.88 points, a decline of 0.67%, at 5900.58 points. The Nasdaq Composite index decreased by 129.58 points, a drop of 0.68%, at 19013.14 points.