Capital market regulator Securities and Exchange Board of India has tightened the dynamic price bands for stocks on which derivative products are available after a set of erroneous orders placed by brokerage Emkay Global on October 5 led to the Nifty crashing over 15% within a few minutes of opening. The regulator on Thursday said stock exchanges should set the dynamic price bands at 10% of the previous closing price for stocks on which derivatives products are available, index and stock futures and also on stocks included in indices on which derivatives products exist.

Source - http://economictimes.indiatimes.com