HDFC Bank is top gainer on Sensex. At 12:52 pm, the share was quoting at Rs 1,253.80, up Rs 45.70, or 3.78%. It has touched an intraday high of Rs 1,262 and an intraday low of Rs 1,175. It was trading with volumes of 193,513 shares. Yesterday the share closed up 1.12% or Rs 13.40 at Rs 1,208.10.