The Dow Jones Industrial Average opened down 52.65 points, or 0.10%, at 51,725.39 on Friday, September 18. The Nasdaq Composite Index opened up 93.16 points, or 0.35%, at 26,511.46 on Friday, September 18. The S&P 500 Index opened up 6.26 points, or 0.08%, at 7,643.97 on Friday, September 18.