The Foreign Institutional Investors (FIIs) were net buyers to the tune of Rs 294.19 crore in the futures & option segment on Thursday.According to data released by the NSE, FIIs were net buyers of index futures to the tune of Rs 70.45 crore and bought index options worth Rs 225.56 crore. They were net sellers of stock futures to the tune of Rs 0.67 crore and sold stock options worth Rs 1.15 crore.