The Bombay Stock Exchange benchmark Sensex slipped by over 80 points in opening trade on Friday snapping its three-session winning streak. The BSE-30 share benchmark Sensex, which had gained over 495 points or 3.06 per cent in the past three sessions, fell by 80.22 points or 0.48 per cent at 16,630.89 in opening trade with retreating banking, realty and metal stocks. Similarly, the Nifty on the wide-based National Stock Exchange plunged by 24.80 points to 4,965 after hitting 5,000-points level for the first time since May last year. Brokers said emergence of profit-booking by fund as well as retail investors after recording handsome gains in the past three sessions and weakening trends on the other Asian bourses attributed to the decline in stock prices.