Foreign institutional investors (FIIs) were net buyers of Rs 526.90 crore on Thursday, November 9, according to data released by Sebi today.While FIIs made gross purchases of Rs 2,276.80 crore, gross sales totalled Rs 1,749.90 crore.Mutual funds (MFs) were net sellers of Rs 71.06 crore on Thursday. MFs made purchases of Rs 451.52 crore and sales of Rs 522.58 crore.