The 30-scrip sensitive index (Sensex) of the S&P Bombay Stock Exchange (BSE), which opened at 20,955.74 points, was trading at 20,956.77 points in the pre-noon session, down 1.04 points or 0.00 percent from previous day's close at 20,957.81 points. The Sensex touched a high of 21,049.84 points and a low of 20,922.45 points during the trade so far.