NEW YORK, April 22 (Reuters) - U.S. stocks opened modestly higher on Monday, rebounding from stocks' worst week in 2013, though mixed results from Caterpillar Inc (NYSE: CAT - news) and Halliburton Co pointed to choppy trading ahead.
The Dow Jones industrial average was up 14.45 points, or 0.10 percent, at 14,561.96. The Standard & Poor's 500 Index was up 2.43 points, or 0.16 percent, at 1,557.68. The Nasdaq Composite Index was up 10.02 points, or 0.31 percent, at 3,216.08.
