No one knows where it came from or what it was meant to do, but CNBC reports 4% of all trading in the U.S. stock market last week was executed by one algorithm that placed orders once every 25 milliseconds and then canceled them. It appears to be a firm's way of baiting buyers interested in purchasing a specific stock and forcing them to reveal their positions - ah, the joys of HFT. http://www.cnbc.com/id/49333454/
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