The foreign institutional investors (FIIs) were net buyers to the tune of Rs 3.76 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 330.85 crore while they bought index options worth Rs 26.06 crore. They were net buyers of stock futures to the tune of Rs 312.62 crore while they sold stock options worth Rs 4.07 crore.As per data available on the Sebi website - FIIs were net buyers of stocks worth Rs 640.40 crore in the spot market on Friday. Domestic mutual funds (MFs) were net sellers of shares worth Rs 109.43 crore on the same day.