The foreign institutional investors (FIIs) were net sellers to the tune of Rs 902.99 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 556.31 crore and they sold index options worth Rs 24.05 crore. They were net sellers of stock futures to the tune of Rs 312.17 crore and they sold stock options worth Rs 10.45 crore.As per data available on the Sebi website - FIIs were net buyers of stocks worth Rs 555 crore in the cash market on Wednesday. Mutual funds (MFs) were net sellers of shares worth Rs 115.50 crore on the same day.