Stocks opened down on Friday as concern ahead of results of European bank stress tests offset another batch of solid U.S. corporate earnings.

The Dow Jones industrial average <.DJI> was down 18.39 points, or 0.18 percent, at 10,303.91. The Standard & Poor's 500 Index <.SPX> fell 3.36 points, or 0.31 percent, at 1,090.31. The Nasdaq Composite Index <.IXIC> was off 13.67 points, or 0.61 percent, at 2,232.22.

(Reporting by Caroline Valetkevitch; editing by Jeffrey Benkoe)