The Dow Jones Industrial Average opened down 166.35 points, or 0.32%, at 52,254.85 on Tuesday, September 15. The Nasdaq Composite Index opened down 30.63 points, or 0.12%, at 26,155.78 on Tuesday, September 15. The S&P 500 Index opened down 9.70 points, or 0.13%, at 7,610.26 on Tuesday, September 15.