(Bloomberg) -- Corporate activist Carl Icahn’s fortune tumbled more than $10 billion Tuesday after short-seller Hindenburg Research accused him of using a “ponzi-like” economic structure at his investment company.Most Read from BloombergNigeria Targeted a UK Mansion; Its Next Leader’s Son Now Owns ItWall Street Rattled by 15% Tumble in Pair of Banks: Markets WrapIBM to Pause Hiring for Jobs That AI Could DoMorgan Stanley Plans 3,000 More Job Cuts as Dealmaking SlumpsRegional Bank Shares Plunge o