US stock futures are getting slammed after Brexit vote stuns markets (SPX, SPY)

After surprises in the UK's EU referendum, US stock futures are getting absolutely demolished. Near 10:30 p.m. ET, S&P 500 futures were down as many as 75 points to as low as 2,030 while Dow futures were off more than 550 points to around 17,400.  Both S&P 500 and Dow futures were down more than 3.5%.  On Thursday, the S&P 500 closed at 2,113 in New York. Here's Business Insider UK's live blog of the vote with some of the major headlines stunning markets: ITV News is now predicting 75% cha...