The document provides a summary of derivative market activity in India for May 27, 2010. It notes that open interest for Nifty futures decreased by 8.26% while Minifity futures decreased by 16.72%. The Nifty May future closed at a discount while the June future closed at a discount of 13.25 points. Some stocks like Hindzinc, Indhotel, and Canbk saw increases in open interest while stocks like Grasim, HotelEela, and Minifty saw decreases in open interest.