US stocks fell in opening trade on Friday after a three-day rally, with shares of Blackberry leading the way as the struggling phone maker reported a surprise quarterly loss.
Five minutes into trade, the Dow Jones Industrial Average was down 62.71 points (0.42 per cent) to 14,961.78.
The broad-based S&P 500 lost 5.31 points (0.33 per cent) to 1,607.89, while the tech-rich Nasdaq Composite Index fell 11.91 (0.35 per cent) to 3,389.95.
Blackberry shares took a heavy hit, falling 26 per cent to $10.74, after turning in a surprise $US84 million ($A90.93 million) loss for the quarter to June 1, despite a pickup in revenues from the launch of the company’s new smartphone.