The Foreign institutional investors (FIIs) were net buyers of Rs 270.74 crore in the futures & options segment on Thursday.According to data released by the NSE, FIIs were net sellers of index futures to the tune of Rs 813.48 crore and bought index options worth Rs 1,198.92 crore. They were net sellers of stock futures to the tune of Rs 104.15 crore and sold stock options worth Rs 10.55 crore.