ArsTechnica – How elite hackers (almost) stole the NASDAQ
I recall seeing a NASDAQ trading blackout a few months ago. Although NASDAQ claimed the 4 hour blackout was the result of a high speed trading glitch, it is more probable that these incidents are related given this article. See full article here: http://arstechnica.com/security/2014/07/how-elite-hackers-almost-stole-the-nasdaq/