The Foreign institutional investors (FIIs) were net sellers of Rs 1,003.16 crore in the futures & options segment on Monday.According to data released by the NSE, FIIs were net sellers of index futures to the tune of Rs 626.53 crore and sold index options worth Rs 140.74 crore. They were net sellers of stock futures to the tune of Rs 225.28 crore and sold stock options worth Rs 10.62 crore.