The Sensex shrugged off its early losses and swung by almost 258 points, a short while ago on the back of bargain buying in banking, auto, metal, capital goods and IT sector stocks. Sensex, which had opened 161 points down at 19,101 level, bounced back and now trading at 19,520 level. It had lost 440 points in the previous five straight sessions. In a similar fashion, the wide-based National Stock Exchange Nifty index, which slid by 50 points in early trade is now trading up 74 points at 5,861 points.