A federal jury has found short seller Andrew Left guilty of securities fraud, delivering a notable win for the U.S. Department of Justice in a criminal case closely watched by the securities bar, hedge funds, issuers, and compliance teams. Prosecutors alleged that Left used his public commentary to move stock prices while privately trading in ways that conflicted with the market-facing views he was promoting.

The verdict is significant because it pushes market-manipulation enforcement beyond the familiar civil playbook and into criminal territory.