NEW YORK (AP) -- Stocks are lower in midday trading on Wall Street as traders react to some disappointing earnings from U.S. companies.
Laboratory Corporation of America plunged 10 percent Wednesday after cutting its full-year earnings forecast.
Joy Global, a maker of mining equipment, sank 4 percent after reporting earnings that fell short analysts' forecasts.
The Standard & Poor's 500 index fell 11 points, or 0.6 percent, to 1,791 as of noon Eastern time. The index is down almost 1 percent this month; it's still up 26 percent so far this year.
The Dow Jones industrial average dropped 76 points, or 0.5 percent to 15,896. The Nasdaq composite fell 29 points, or 0.7 percent, to 4,030.
MasterCard rose 4 percent after announcing a stock split, a dividend increase and a stock buyback program.