The Dow Jones Industrial Average opened down 133.56 points, or 0.25%, at 53,326.22 on Tuesday, August 18. The Nasdaq Composite Index opened down 286.81 points, or 1.08%, at 26,358.1. The S&P 500 Index opened down 34.63 points, or 0.45%, at 7,710.76 on Tuesday, August 18.