Benchmark indices Sensex and Nifty erased their losses to trade in green on October 30 due to various reasons, including buying in IT shares. At 12 pm, the Sensex was up 555.33 points or 0.75% at 74,706.37, and the Nifty was up 166.6 points or 0.73% at 23,103.35. About 1,231 shares advanced, 2,518 shares declined, and 167 shares were unchanged. Sensex rose 600 points from day's low while Nifty reclaimed psychologically important 23,100-mark.