The zone of 11,540-11,550 is a crucial level to watch out as 11,549 is the current month's lowest level and the 23.6 per cent retracement for the upmove leg from the low of 10,585-11,856 is placed at 11,556. In case Nifty falls below 11,550-11,540 zone, it may witness some more weakness towards 11,440 and 11,380 levels. On the upside, the 20-day moving average placed at 11,613 is likely to act as an immediate resistance, followed by 11,645. Stocks in news: Lupin, NBCC, Tata Power, Tata Global Beverages, SML Isuzu, Tiger Logistics, Maruti Suzuki India, NIIT Technologies, Infosys.