Going ahead, Nifty has support placed around the level of 11,550, which is 50 per cent retracement level of the recent upmove, followed by 11,500, which is 61.8 per cent retracement level. On the upside, the level of 11,640 is likely to act as a stiff resistance for the Nifty. Stocks in news: Persistent Systems, Reliance Infrastructure, Hotel Leela venture, NHPC, Yuken India, Jet Airways, Reliance Capital and Idea Cellular.