Market Data Firm Spots the Tracks of Bizarre Robot Traders

Mysterious and possibly nefarious trading algorithms are operating every minute of every day in the nation's stock exchanges. What they do doesn't show up in Google Finance, let alone in the pages of the Wall Street Journal. No one really knows how they operate or why. But over the past few weeks, Nanex, a data services firm has dragged some of the odder algorithm specimens into the light. via Market Data Firm Spots the Tracks of Bizarre Robot Traders - Science and Tech - The Atlantic.