The Foreign Institutional Investors (FIIs) were net buyers to the tune of Rs 174.42 crore in the futures & options segment on Friday.According to data released by the NSE, FIIs were net buyers of index futures to the tune of Rs 205.57 crore and sold index options worth Rs 5.29 crore. They were net sellers of stock futures to the tune of Rs 40.30 crore and bought stock options worth Rs 14.44 crore.