Mark Cuban.
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- Mark Cuban is among the richest people in the US, with an estimated net worth of $5.7 billion.
- He's earned his fortune through business deals including the $5.7 billion sale of Broadcast.com.
- The "Shark Tank" investor has spent millions on private planes, a yacht, and a lavish Dallas home.
Mark Cuban, 66, is one of the wealthiest people in America, with an estimated net worth of $5.7 billion, according to Forbes.