Stock Market News Today: Domestic benchmark equity indices opened on a weak note on June 18.The Sensex opened 268.68 points or 0.32 per cent lower at 81,327.61 levels. On the other hand the Nifty 50 opened 65.05 points or 0.26 per cent lower at 24,788.35. The broader markets also mirrored the benchmarks, in early trade as the the Nifty Midcap 100 traded lower by 0.29 per cent and the the Nifty Smallcap 100 fell around 0.51 per cent. While all major sectoral indices opened lower, the Nifty IT and Nifty Realty traded in the green, gaining up to 0.45 per cent in early trade.