Identifying cyber crime as a major threat, Sebi Chairman U K Sinha recently said such attacks are occurring these days in a more sophisticated manner.
The NYSE accounts for more than 60 percent of S&P 500 volume at the close of the market
The shutdown was the longest in recent memory, and prompted US Securities and Exchange Commission Chair Mary Jo White to call for a meeting of Wall Street leaders to help insure the 'continuous and orderly' functioning of securities markets.