U.S. stocks fell on Wednesday, with technology shares sliding after some companies said they would miss analysts' quarterly earnings forecasts, according to Reuters. Shares of network infrastructure company ADC Telecommunications Inc. and software maker Mercury Interactive Corp. were lower after the companies said they expected to miss Wall Street's expectations. The Dow Jones industrial average was down 55.30 points, or 0.53 percent, at 10,385.81. The Standard & Poor's 500 Index was down 9.51 points, or 0.78 percent, at 1,204.96. The technology-laced Nasdaq Composite Index fell 21.99 points, or 1.03 percent, to 2,117.37. "There is probably a higher level of uncertainty about how this earnings season is going to play out than in any other earnings season in a long time," said Hugh Johnson, chief investment officer at Johnson Illington Advisors in Albany, New York. "There are a lot of tight stomachs when it comes to looking at earnings season." The major indexes also retreated after a report from the Institute for Supply Management that its services index fell to 53.3 in September, down from 65 in August and well below the median Wall Street forecast of 61. Any number above 50 indicates growth.