The Foreign Institutional Investors (FIIs) were net buyers to the tune of Rs 474.03 crore in the futures & option segment on Friday.According to data released by the NSE, FIIs were net buyers of index futures to the tune of Rs 352.27 crore while sold index options worth Rs 7.44 crore. They were net buyers of stock futures to the tune of Rs 132.35 crore while sold stock options worth Rs 3.15 crore.As per data available on the Sebi website - FIIs were net buyers of stocks worth Rs 18.50 crore in the cash market on Wednesday. Mutual funds net sellers of shares worth Rs 206.35 crore on the same day.