This will give him something to talk about. Notoriously outspoken billionaire owner of the Dallas Mavericks Mark Cuban was found not guilty on Wednesday of insider trading. He had been accused by the SEC of illegally selling 600,000 shares of Mamma.com after receiving information from the owner of the website. The high-profile trial was part of a recent spate of public crackdowns by the SEC as it tried to salvage its reputation post-financial crisis.