Technically legal, but it doesn't sound right at all. Since 2005, these high frequency traders have been taking advantage of proximity, loopholes in the market, and supercomputers that essentially have the ability to see how trader's and investors will act. The programs can then perform trades, buying and selling the stock in milliseconds, before ordinary traders or investors even know anything happened. Although the profit of each individual trade is relatively small, considering the fact that these computers can perform millions of trades in less than a second, the high frequency traders profited approximately $21 billion last year alone. Sounds definitely like a threat to the integrity of the market. Some might even think its equivalent to insider trading. Really interesting, and alarming? http://news.cnet.com/Stock-traders-...lliseconds/2100-1014_3-6249912.html?tag=mncol