The foreign institutional investors (FIIs) were net sellers to the tune of Rs 373.14 crore in the futures & option segment on Monday.According to data released on the NSE website, FIIs were net sellers of index futures to the tune of Rs 514.56 crore while they bought index options worth Rs 41.44 crore. They were net buyers of stock futures to the tune of Rs 94.54 crore and they bought stock options worth Rs 5.44 crore.As per data available on the Sebi website - FIIs were net sellers of stocks worth Rs 81.80 crore in the spot market on Monday. Domestic mutual funds (MFs) were net buyers of shares worth Rs 145.05 crore on the same day.