Several stocks plunged in excess of 5 per cent in Mumbai trading on Tuesday even as equity benchmark BSE Sensex traded 267.02 points up at 66433.95 amid brisk buying in frontline bluechip counters. On the BSE, Vedant Asset(down 13.81 per cent), Amanaya Ventures(down 9.93 per cent), Square Four Project(down 8.85 per cent), Relic Techn(down 8.28 per cent) and Odyssey Corp(down 7.14 per cent) were among the stocks that plunged over 5 per cent during the session. In the Nifty pack, 44 stocks traded in the green, while 6 stocks traded in the red. The Nifty index was trading 86.55 points up at 19818.3. On the BSE, Progrex Ventures, Esha Media, Aanchal Ispat, Winsome Yarns and Xelpmoc Design hit their fresh 52-week lows, while Innovative Tech, KIOCL, Sujala Trading, Cinevista Ltd and Keynote Financial touched their fresh 52-week highs.