Wall Street Journal -- U.S. stocks were down Tuesday as the Dow Jones Industrial Average fell 34 points to 8393, the S&P 500 declined 6 points to 901 and the Nasdaq Composite lost 20 points to 1743. Among the companies whose shares were actively trading are MGM Mirage (MGM), Pegasystems Inc. (PEGA) and Hologic Inc. (HOLX).