The Foreign Institutional Investors (FIIs) were net sellers to the tune of Rs 422.57 crore in the futures & option segment on Tuesday.According to data released by the NSE, FIIs were net sellers of index futures to the tune of Rs 687.99 crore while bought index options worth Rs 305.04 crore. They were net sellers of stock futures to the tune of Rs 40.25 crore while bought stock options worth Rs 0.62 crore.As per data available on the Sebi website - FIIs were net sellers of stocks worth Rs 582.10 crore in the cash market on Monday. Mutual funds were net buyers of shares worth Rs 270.59 crore on the same day.