Maintaining the upward trend, the Sensex at the Bombay Stock Exchange was trading more than 325 points in the positive zone, in afternoon trade today. The 30-share index, which had surged by 487 points in opening trade to hit a new record high of 21,484, was trading 326 points at 21,323, a short while ago.The Nifty at the National Stock Exchange was trading 100 points up to 6,360.