Foreign institutional investors (FIIs) were net buyers of Rs 422.30 crore on Monday, December 11, according to data released by Sebi today.While FIIs made gross purchases of Rs 2,442.60 crore, gross sales totalled Rs 2,020.30 crore.Mutual funds (MFs) were net sellers of Rs 602.21 crore on Monday. MFs made purchases of Rs 358.63 crore and sales of Rs 960.84 crore.