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CNBC: Mysterious Algorithm Was 4% of Trading Activity Last Week

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9/9/08
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A single mysterious computer program that placed orders — and then subsequently canceled them — made up 4 percent of all quote traffic in the U.S. stock market last week, according to the top tracker of high-frequency trading activity. The motive of the algorithm is still unclear.

http://www.cnbc.com/id/49333454
 
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