Wall Street shares ended lower on their first trading session in the new year as traders took profits after the benchmark index Standard & Poor's 500 recorded its best yearly performance since 1997. The Dow Jones industrial average dropped 0.82% to 16,441.35, the S&P 500 Index lost 0.89% to 1,831.98 and the Nasdaq Composite Index slid 0.80% to 4,143.07.