Equity benchmarks Sensex and Nifty opened on a choppy note on Monday tracking profit booking at higher levels and a weak trend in global markets. After dropping over 100 points in the opening session, the 30-share index turned flat. It was trading 20.92 points or 0.04 per cent lower at 55,416.37, while the broader NSE Nifty slipped 11.50 points or 0.07 per cent to 16,517.60.

PowerGrid was the top loser in the Sensex pack, shedding over 1 per cent, followed by Bajaj Auto, Maruti, Dr Reddy's, Asian Paints and Titan. On the other hand, M&M, Tata Steel, TCS and Tech Mahindra were among the gainers. In the previous session, Sensex jumped 593.31 points or 1.08 per cent to its new all-time high of 55,437.29, and Nifty breached the 16,500 level, advancing 164.70 points or 1.01 per cent to its fresh closing peak of 16,529.10.