The Foreign Institutional Investors (FIIs) were net buyers to the tune of Rs 1,044.91 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 864.54 crore and bought index options worth Rs 131.87 crore. They were net buyers of stock futures to the tune of Rs 48.50 crore. As per data available on the Sebi website - FIIs were net buyers of stocks worth Rs 395.70 crore in the cash market on Friday. Mutual funds net sellers of shares worth Rs 384.68 crore on the same day.