Short seller's report causes $10 billion loss for Carl Icahn.
Hindenburg Research, a short seller firm, has targeted Carl Icahn's publicly traded company, Icahn Enterprises, accusing it of being overvalued and using money from new investors to pay out dividends to old investors. Hindenburg likened Icahn Enterprises to "Ponzi-like economic structures" and said it was betting that the company's shares would fall. Icahn Enterprises responded by standing by its disclosures and accusing Hindenburg of publishing a self-serving report to generate profits on its short position. The company's stock tumbled 20 percent on Tuesday.