Federal Jury Clears Mark Cuban of Insider Training

In Dallas

A federal jury in Dallas ruled on Wednesday that Mark Cuban did not commit insider trading when he dumped his stake in an Internet company, clearing the billionaire entrepreneur of wrongdoing and dealing a blow to the federal agency that Mr. Cuban battled tooth and nail for five years.

The agency, the Securities and Exchange Commission, was hoping to build on the momentum it gained from the recent trial win against Fabrice Tourre, a formerGoldman Sachs trader at the center of a toxic mortgage deal.