The Foreign Institutional Investors (FIIs) were net sellers to the tune of Rs 143.35 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 280.75 crore while bought index options worth Rs 202.29 crore. They were net sellers of stock futures to the tune of Rs 73.96 crore while bought stock options worth Rs 9.06 crore.As per data available on the Sebi website - FIIs were net buyers of stocks worth Rs 889.30 crore in the cash market on Monday. Mutual funds were net buyers of shares worth Rs 190.70 crore on the same day.