The Foreign Institutional Investors (FIIs) were net sellers to the tune of Rs 64.03 crore in the futures & option segment on Monday.According to data released by the NSE, FIIs were net buyers of index futures to the tune of Rs 77.13 crore and bought index options worth Rs 162.41 crore. They were net sellers of stock futures to the tune of Rs 311.12 crore while bought stock options worth Rs 7.56 crore.As per data available on the Sebi website - FIIs were net buyers of stocks worth Rs 575.50 crore in the cash market on Friday. Mutual funds were net buyers of shares worth Rs 291.30 crore on the same day.