Foreign institutional investors (FIIs) were net buyers of Rs 1,155.93 crore (provisional) on Friday, according to data released by BSE.While FIIs made gross purchases of Rs 3,996.49 crore, gross sales totalled Rs 2,840.56 crore.FIIs were net buyers of Rs 883.10 crore on Thursday, July 19, according to data released by Sebi on Friday. While FIIs made gross purchases of Rs 3,762 crore, gross sales totalled Rs 2,878.90 crore.Mutual funds (MFs) were net buyers of Rs 111.60 crore on Thursday. MFs made purchases of Rs 861.60 crore and sales of Rs 750 crore.