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“When you are a billionaire and you know a stock is going to down, your instinct might be to sell it. But if you know that the stock is going to tank because you are privy to insider information, it’s probably not a good idea to sell that stock. Entrepreneur Mark Cuban, who owns the Dallas Mavericks and is chairman of HDNet, finds himself facing insider trading charges from the SEC because of doing just that. Back in June, 2004, he sold 600,000 shares of search engine Mamma.com after he was asked by the company to participate in a dilutive follow-on offering.” source...