The Dow Jones Industrial Average opened down 398.29 points, or 0.76%, at 52,349.03 on Wednesday, July 29. The S&P 500 opened down 10.87 points, or 0.15%, at 7,418.35. The Nasdaq Composite opened down 47.14 points, or 0.19%, at 24,829.77 on Wednesday, July 29.