Citadel Fund Said to Quadruple With High-Frequency Trades

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High-frequency trading has been good to billionaire Ken Griffin.

His Citadel LLC returned more than 300 percent in a fund started as a high-frequency strategy in late 2007, according to two people familiar with the Chicago-based money manager. The $830 million pool, which added other strategies in recent years, beat the 44 percent gain of the U.S. stock market in the six years through 2013 as well as Griffin’s two main hedge funds, which together have $8.8 billion in assets and rose 45 percent in the period.