The Dow Jones Industrial Average opened down 223.90 points, or 0.53%, at 41,827.16 points on May 15 (Thursday); the S&P 500 opened down 21.58 points, or 0.37%, at 5,871.00 points on May 15 (Thursday); the Nasdaq Composite opened down 128.02 points, or 0.67%, at 19,018.79 points on May 15 (Thursday).