Mamma.com

In 2008, the SEC filed insider trading charges against Mark Cuban for selling 600,000 shares of Mamma.com. Cuban fought the charges, saying he never agreed to keep anything about Mamma.com confidential. Therefore, Cuban contended, this wasn't insider trading. He wasn't an insider.

Billionaire Mark Cuban, who relishes a good fight with everyone from NBA referees to readers of his popular blog, has got a doozy on his hands: now he's fighting the Securities & Exchange Commission's accusations of insider trading. At issue is whether the 50-year-old entrepreneur improperly...