Benchmark indices Sensex and Nifty rose up to 0.7% on October 21 due to various reasons, including buying in IT and Reliance Industries shares. At 9:53 am, the Sensex was up 514.21 points or 0.7% at 74,367.11, and the Nifty was up 131.35 points or 0.57% at 23,020.30. About 1,116 shares advanced, 2,206 shares declined, and 196 shares were unchanged. Key factors behind market gain 1) Buying in IT shares