The Foreign Institutional Investors (FIIs) were net sellers to the tune of Rs 763.76 crore in the futures & option segment on Monday.According to data released by the NSE, FIIs were net sellers of index futures to the tune of Rs 765.58 crore while bought index options worth Rs 240.02 crore. They were net sellers of stock futures to the tune of Rs 235.46 crore and sold stock options worth Rs 2.74 crore.As per data available on the Sebi website - FIIs were net buyers of stocks worth Rs 78.20 crore in the cash market on Friday. Mutual funds were net sellers of shares worth Rs 26.70 crore on the same day.