(Bloomberg) -- Former SAC Capital Advisors LP fund manager Mathew Martoma was found guilty in the most lucrative insider trading scheme ever as federal prosecutors racked up a seventh conviction in their six-year probe of the hedge fund and its billionaire founder, Steven A. Cohen.

Jurors in Manhattan federal court found Martoma, 39, used secret tips on clinical trials of an Alzheimer’s disease drug to trade Wyeth and Elan Corp. shares. In doing so, he reaped a $275 million benefit for the hedge fund. Martoma chose to risk a trial after rejecting U.S. offers of a deal for cooperation. He faces as long as 20 years in prison on the most serious counts.

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