Under Armour, PayPal and others joined the lengthening parade of big U.S. companies reporting bigger-than-expected profits for the first three months of the year. A drop in oil prices helped pull energy stocks lower. Benchmark U.S. crude dropped $1.05, or 2.1 percent, to $48.57 per barrel, while Brent crude, which is used to price international oils, dropped $1.03 to $51.38 per barrel. Under Armour surged to the biggest gain in the S&P 500 after reporting results for the first quarter that were better than analysts' expectations. PayPal Holdings jumped $3.32, or 7.5 percent, to $47.73 after also reporting stronger revenue and earnings than Wall Street had forecast. Natural gas slipped 4 cents to $3.23 per 1,000 cubic feet, heating oil fell 3 cents to $1.51 per gallon and wholesale gasoline dropped 4 cents to $1.56 per gallon.