Share Market Today: Headline indices witnessed broad-based selling on May 13, one day after witnessing a nearly 4 per cent rally. The 30-Share Sensex closed at 81,148.22 down by 1281.68 points or 1.55 per cent. The Nifty 50 index ended lower by 346.35 points or 1.39 per cent at 24,578.35. The headline indices ended lower following likely profit-booking.