Nifty (September) future premium has increased from 16.45 points to 18.70 points and around 3.35 lakh shares were shed in open interest. Total open interest in the market was Rs87,287 crore and Rs1,842 crore were added in open interest. Nifty call option added 12.20 lakh shares in open interest, whereas put option added 8.22 lakh shares in open interest. Kotak Mahindra Bank (86%), Canara Bank (30%), GVK Power and Infrastructure (12%), National Aluminum (11%) and Rolta India (10%) were the top open interest gainers in the market. Great Offshore (-38%), Akruti City (-20%), Ballarpur Industries (-16%) and Essar Oil (-10%) were the top open interest losers in the market.