NEW YORK, March 27 (Xinhua) -- U.S. stocks ended higher on Wednesday, snapping a three-day string of losing sessions at the end of the quarter. The Dow Jones Industrial Average rose 477.75 points, or 1.22 percent, to 39,760.08. The S&P 500 added 44.91 points, or 0.86 percent, to 5,248.49. The Nasdaq Composite Index increased 83.82 points, or 0.51 percent, to 16,399.52. All the 11 primary S&P 500 sectors ended in green, with utilities and real estate leading the