Benchmark indices Sensex and Nifty climbed from day's low to trade in mild green on October 27 due to various reasons, including value buying. At 12:43 pm, the Sensex was up 140.37 points or 0.19% at 73,747.12, and the Nifty was up 70.85 points or 0.31% at 22,824.05. About 2,742 shares advanced, 1,057 shares declined, and 158 shares were unchanged. Key factors behind market gain Value buying emerged from lower levels a day after the markets snapped four-day losing streak.