At Close, the Sensex index fell 664 points from the day's high to close at 55,769, down 49 points or 0.09 percent. and the Nifty50 shed 44 points to 16,584, amid the volatile session and selling pressure. Reliance Industries (RIL) was the top gainer, followed by Infosys, L&T, HCL Technologies, and Sun Pharma. The top laggards were Ramco Cement, ACC, Nuvoco Vistas, and Grasim. About two shares declined for every share rising on the NSE. The Nifty Auto index was the worst hit as it shed around 1.8 percent, while the Nifty Bank, Metal, PSU/Private Banks, and Realty indices fell up to 1 percent each. The Nifty IT index was the only gainer, up 0.45 percent. The BSE MidCap and SmallCap indices fell 1.45 percent and 1.16 percent.