Mumbai: Suffering one of their worst setbacks in recent months, Sensex ended the trading today on weak note. Realty stocks took a severe beating. Oil stocks, led by heavyweight Reliance Industries, saw some heavy selling in the session. Metal, information technology, capital goods, power and bank stocks too felt the heat. Automobile stocks found some support midway through the session, but lost their way in late afternoon trade. PSU stocks too had a weak outing. Select pharmaceuticals and FMCG stocks had a good outing today. The Sensex, which plunged to 17,344.58 in late afternoon trade, ended the day at 17,380.08 with a big loss of 310.54 points or 1.76 percent, while the broader 50-stock Nifty index of the National Stock Exchange settled at 5215.45, recording a loss of 92.90 points or 1.75 percent. The Nifty touched a low of 5202.45 during the day. The mood was so bearish that just 5 stocks out of the 30-stock strong Sensex closed in positive territory.