The Foreign Institutional Investors (FIIs) were net sellers to the tune of Rs 77 crore in the futures & option segment on Thursday.According to data released by the NSE, FIIs were net sellers of index futures to the tune of Rs 31.32 crore while bought index options worth Rs 156.85 crore. They were net sellers of stock futures to the tune of Rs 212.98 crore while bought stock options worth Rs 10.45 crore.As per data available on the Sebi website - FIIs were net buyers of stocks worth Rs 653.10 crore in the cash market on Wednesday. Mutual funds were net buyers of shares worth Rs 149.30 crore on the same day.