On Thursday, the benchmark indices were trading flat with the Sensex down around 30 points or 0.05% at 64,947 and the Nifty-50 down around 9 points or 0.04% at 19,435. About 1732 shares have advanced, 1647 declined, and 156 are unchanged on the BSE. Top gainers and losers on the BSE Sensex index are as …