A former Goldman Sachs Group programer was indicted on charges he stole computer code for the investment bank's high-frequency trading platform, federal prosecutors said on Thursday.

The former programer, Sergey Aleynikov, 40, was arrested and charged in July. The three-count indictment alleges that Aleynikov, who worked at Goldman from May 2007 to June 2009, illegally transferred and downloaded "hundreds of thousands of lines of source code for Goldman's high-frequency trading system" on his last day at the firm.

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