The Foreign Institutional Investors (FIIs) were net sellers to the tune of Rs 3.56 crore in the futures & options segment on Thursday.According to data released by the NSE, FIIs were net buyers of index futures to the tune of Rs 350.02 crore and bought index options worth Rs 966.32 crore. They were net sellers of stock futures to the tune of Rs 1,318.11 crore and sold stock options worth Rs 1.80 crore.