The Foreign institutional investors (FIIs) were net buyers of Rs 1,901.33 crore in the futures & options segment on Wednesday, March 19.According to data released by the NSE, FIIs were net buyers of index futures to the tune of Rs 1,838.77 crore and sold index options worth Rs 175.11 crore. They were net buyers of stock futures to the tune of Rs 239.51 crore and sold stock options worth Rs 1.85 crore.