The benchmark domestic equity indices today ended with marginal gains, tracking positive cues from Asian markets. The 30-share index at the Bombay Stock Exchange, Sensex, rose 123 points, to close at 82,515. The National Stock Exchange Nifty-50 added 37 points, to settle at 25,141. The broader market indices at the BSE ended mixed. The Mid-Cap index declined over 0.1 percent, while the Small-Cap index ended nearly flat.