Citron Research founder Andrew Left is scheduled to stand trial in Los Angeles on Monday for alleged market manipulation via social media posts.
Prosecutors allege Left opened short positions and posted false negative comments, profiting $700,000 from Roku on Jan 8, 2019.
Government claims Left earned $16 million from manipulating shares of companies including Tesla and American Airlines.
Left denies wrongdoing, arguing his opinions are protected speech and trades need not be disclosed.