Stock market today: The 30 share BSE Sensex advanced 319.78 points, or 0.39 per cent, to finish at 81,857.48, after moving between an intraday high of 82,084.92 and a low of 81,088.59. The NSE Nifty rose 126.75 points, or 0.51 per cent, to end at 25,175.40.