The Foreign Institutional Investors (FIIs) were net buyers to the tune of Rs 736.86 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 544.80 crore and bought index options worth Rs 255.26 crore. They were net sellers of stock futures to the tune of Rs 63.12 crore and sold stock options worth Rs 0.08 crore.As per data available on the Sebi website - FIIs were net buyers of stocks worth Rs 5,837.10 crore in the cash market on Friday. Mutual funds were net buyers of shares worth Rs 150.90 crore on the same day.