Wall Street opens flat a day before Brexit vote

US stocks opened little changed on Wednesday as investors held off from making big bets, a day ahead of Britain's referendum on its European Union membership.

The Dow Jones industrial average rose 11.57 points, or 0.06%, to 17,841.3, the S&P 500 gained 2.46 points, or 0.12%, to 2,091.36 and the Nasdaq composite added 3.05 points, or 0.06%, to 4,846.81.