Sensex, Nifty Today: Indian markets extended gains for the second straight day as the headline indices ended in the green on May 15. The Nifty 50 index closed at 25,062.10 up by 395.2 points or 1.6 per cent on the other hand the 30-share Sensex also added 1200.18 points to close 1.48 per cent higher at 82,530.74.