MARKET PULSE-Ultragenyx, DFC Global, Atlantic Power, Chipotle
The Dow Jones industrial average was down 0.77 percent at 15,725.8, the S&P 500 was down 0.52 percent at 1,784.8 and the Nasdaq Composite was down 0.42 percent at 4,105.912.
** ALCOA INC, $11.7, -2.09 pct
Vice President Olivier Jarrault sold 175,031 shares of the largest U.S. aluminum producer at an average price of $10.57, according to a regulatory filing, an 11.5 percent discount to the stock's Thursday close.
** CHEVRON CORP, $112.32, -3.55 pct
The second-largest U.S. oil company said its fourth-quarter profit dropped 32 percent as refining margins and production fell around the world.