The Sensex at the Bombay Stock Exchange surged over 300 points, to 16,353 in opening trade on Friday morning on fresh buying by funds and retail investors. But after surrendering all of its early gains, the Sensex stood 127 points, or 0.8 percent in the red, at 15,925, a short while ago. But stock markets across the globe rose, after GDP data showed that the US economy returned to growth in the third quarter for the first time in more than a year. Key stock indices in Hong Kong, China, Japan and Singapore were up by between 1 per cent and 2.5 percent on Friday. Wall Street's key index, the Dow Jones Industrial Average had surged 2 per cent overnight.