This document provides a summary of derivative trading activity in India for June 15, 2010. Open interest for Nifty futures increased by 1.69% while open interest for Minifity futures increased by 15.77%. The Nifty June future closed at a premium while the July future closed at a premium of 2.60 points. Some stocks saw increases in open interest like Unitech (23.69%), Polaris (14.81%), and Cummins (14.44%) while others saw decreases like Dr. Reddy's (11.53%), GMDC (-8.81%), and Tech Mahindra (-8.28%). Put-call ratios and historical volatility are also reported for various stocks.