In a report published on Tuesday, Hindenburg accused IEP of overvaluing its holdings and relying on a "Ponzi-like" structure to pay dividends. The subsequent plunge in IEP shares wiped $2.9 billion off Icahn's net worth, leaving him with an estimated $14.7 billion, according to Forbes. NAV is a key gauge of a fund's performance, measuring the market value of securities held by the fund. Driving the frothiness in IEP's stock, Hindenburg argued, is its dividend yield of 15.8%, the highest of any U.S. large cap company by far. Hindenburg also offered examples it said showed IEP itself was valuing its holdings way above their market value.

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