Foreign institutional investors (FIIs) were net buyers of Rs 422.90 crore on Monday, November 6, according to data released by Sebi today.While FIIs made gross purchases of Rs 1907.40 crore, gross sales totalled Rs 1484.60 crore.Mutual funds (MFs) were net buyers of Rs 164.30 crore on Monday. MFs made purchases of Rs 575.52 crore and sales of Rs 411.22 crore.