Foreign institutional investors (FIIs) were net buyers of Rs 250.50 crore on August 9, Wednesday according to data released by Sebi today.While FIIs made gross purchases of Rs 1292.20 crore, gross sales totalled Rs 1041.80 crore.Mutual funds (MFs) were net buyers of Rs 198.08 crore on Wednesday. MFs made purchases of Rs 571.80 crore and sales of Rs 373.72 crore.