The Foreign Institutional Investors (FIIs) were net sellers to the tune of Rs 496.63 crore in the futures & options segment on Wednesday.According to data released by the NSE, FIIs were net buyers of index futures to the tune of Rs 45.05 crore and bought index options worth Rs 49.84 crore. They were net sellers of stock futures to the tune of Rs 582.68 crore and sold stock options worth Rs 8.84 crore.