Ken Griffin ranks among the greatest hedge fund managers of all time. His net worth of $36.7 billion -- built largely through Griffin's hedge fund, Citadel -- is one of the biggest proofs behind that claim.

Much of Griffin's tremendous success has resulted from his out-of-the-box thinking. So what's the billionaire investor's biggest holding right now? You might be surprised.

Citadel's portfolio includes thousands of stocks. Name a stock, and there's a pretty good chance Griffin has at least a small position in it.

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Source Fool.com