Sensex, Nifty Today: The headline indices ended a two-session gaining streak as the 30-share Sensex and the Nifty 50 closed lower by as much as 0.76 per cent. The Sensex ended at 81,551.63, declining 624.82 points, and the Nifty 50 closed lower by 174.95 points at 24,826.2 amid likely profit booking following two sessions of back-to-back gains.