(Reuters) - U.S. stocks fell on Friday as momentum shares like Netflix and TripAdvisor sold off for a second straight session, giving the Nasdaq its biggest daily percentage loss since early February.

The Dow Jones industrial average fell 159.84 points or 0.96 percent, to end unofficially at 16,412.71. The S&P 500 lost 23.68 points or 1.25 percent, to finish unofficially at 1,865.09. The Nasdaq Composite dropped 110.014 points or 2.6 percent, to close unofficially at 4,127.726.

For the week, the Dow gained 0.6 percent and the S&P 500 added 0.4 percent, while the Nasdaq fell 0.7 percent.