S&P 500 futures rise after early signs Britain will stay in EU

U.S. stock index futures opened higher in after hours trading on Thursday after polls closed in Britain with early signs that the "remain" campaign is leading in the country's EU membership referendum. The gains added to a rally in stocks earlier on Wall Street as investors bet the United Kingdom would remain part of the European Union, potentially avoiding damage to European trand its consequences for the global economy. The campaign to keep Britain in the European Union appeared to be ahead, a