At Thursday's close, the S&P 500 lost 23.3 points, or 0.61%, to 3,807.3 and the Nasdaq Composite dropped 178.32 points, or 1.63%, to 10,792.68 whereas the Dow Jones Industrial Average was up 194.17 points, or 0.61%, to 32,033.28.
After ending Monday firmer, Nasdaq futures lost 1.4%, with traders blaming an earnings warning from Snap which saw shares in the Snapchat owner tumble 28%.