U.S. stocks trade flat to end the week

NEW YORK, June 21 (Xinhua) -- U.S. stocks ended flat and mixed on Friday, upon better-than-expected U.S. purchasing managers' index (PMI) in June and pullback of Nvidia shares for the second day.

The Dow Jones Industrial Average rose 15.57 points, or 0.04 percent, to 39,150.33. The S&P 500 sank 8.55 points, or 0.16 percent, to 5,464.62. The Nasdaq Composite Index shed 32.23 points, or 0.18 percent, to 17,689.36.