The 30-scrip sensitive index (Sensex) of the S&P Bombay Stock Exchange (BSE), which opened at 20,544.64 points, was trading at 20,515.18 points in the pre-noon session, up 16.93 points or 0.08 percent from the previous day's close at 20,498.25 points. The Sensex touched a high of 20,572.32 points and a low of 20,469.26 points during the trade so far.