The Foreign Institutional Investors (FIIs) were net buyers to the tune of Rs 277.13 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 110.36 crore and bought index options worth Rs 235.74 crore. They were net sellers of stock futures to the tune of Rs 50.49 crore and sold stock options worth Rs 18.48 crore.As per data available on the Sebi website - FIIs were net buyers of stocks worth Rs 677.30 crore in the cash market on Friday. Mutual funds were net buyers of shares worth Rs 463.60 crore on the same day.