U.S. stocks added to losses on Friday, with the Dow Jones industrial average falling 1 percent, pressured by bank shares after JPMorgan Chase & Co reported deep fourth-quarter losses.

The S&P and Nasdaq indexes also fell 1 percent.

The Dow Jones industrial average <.DJI> was down 100.97 points, or 0.94 percent, at 10,609.58, after briefly falling more than 1 percent. The Standard & Poor's 500 Index <.SPX> was down 11.63 points, or 1.01 percent, at 1,136.83. The Nasdaq Composite Index <.IXIC> was down 23.51 points, or 1.01 percent, at 2,293.23.

S&P