Wall Street opens lower on Amazon, Ford results

Amazon and Ford fell, thus overshadowing positive numbers from Microsoft

US stocks opened lower on Friday as a number of bellwether names, including Amazon and Ford, fell following their quarterly results, overshadowing positive numbers from Microsoft.

Amazon shares fell 7.5% to $310.80, while Ford was off 3.1% at $15.82. Microsoft, a Dow component, rose 1.1% to $40.29.

The Dow Jones industrial average was down 53.49 points, or 0.32%, at 16,448.16. The Standard & Poor's 500 Index was down 4.91 points, or 0.26%, at 1,873.70. The Nasdaq Composite Index was down 28.07 points, or 0.68%, at 4,120.27.