“Posting to manipulate stock prices” convicted as securities fraud, “Big Short” Citron founder Andrew Left faces up to 25 years in prison.

“Posting to manipulate stock prices” convicted as securities fraud, “Big Short” Citron founder Andrew Left faces up to 25 years in prison.

Andrew Left, founder of Citron Research and head of the well-known short-selling institution, was found guilty of securities fraud by a jury. His "post-trade" operation model was deemed market manipulation, a verdict that will have profound impact on Wall Street’s short-selling industry.

After two full days of deliberation, a Los Angeles federal court jury on Monday convicted Left of the most serious charge—conspiracy to commit securities fraud. Of 16 specific charges related to Tesla, Nvidia, General Electric, Palantir, and Meta, he was found guilty on 12, and not guilty on 4. The 55-year-old investor will be sentenced on August 31, facing up to 25 years in federal prison, though his actual sentence is expected to be less than the maximum.

Outside the court, Left told reporters, "I think the jury got it wrong; this isn’t the end."

He also warned that the case has a "chilling effect" on free speech, citing SpaceX’s upcoming IPO as an example, and said it is "unsettling" to restrict individuals' ability to express honest opinions. His lawyers filed a motion for a retrial, arguing the jury initially received a verdict form that included a charge dismissed by the judge before trial, but the judge has yet to rule on this.

Prosecution: Posting while covertly closing positions

Prosecutors accused Left of posting market-moving messages on social media from 2018 to 2023, inducing followers to trade at his set target prices, while secretly closing his own positions at different prices, earning over $20 million in illegal profits.

According to prosecutor Matthew Reilly’s closing statement, Left's actions were a "post-and-trade" double act. Internal emails presented to the jury showed Left coordinated short-selling targets with hedge funds and boasted about his "influence" among retail investors, saying his gains were like "taking candy from a baby," and claimed "a single tweet can make a stock plummet."

Prosecution witnesses included the CEO of a cannabis company—whose stock price plunged after Left published a bearish report—and a retired firefighter, Billy Banks.

Banks testified that he lost $110,000 in retirement savings in 2018 when stock prices of his holdings dropped after Left’s public comments. After the verdict, Banks told Business Insider he felt "vindicated," "I feel great today, I regret he’s going to jail, but I lost a lot of money, and that's just not right."

Left chose to testify—a rare move for criminal defendants—and maintained his denial of fraud charges even after hours of cross-examination by prosecutors. He argued that immediately trading after publishing reports or tweets was not illegal, "I don’t think there’s any specific law requiring you to hold a position for any length of time after commenting."

Left emphasized he never commented on any company without believing what he said, "I always say what I believe; I speak the truth." He also clearly stated he has never publicly talked down a stock while going long, nor publicly talked up a stock while shorting it.

Defense attorney Eric Rosen criticized the prosecution’s charges as baseless in his closing statement, "The government wants you to convict a trader for trading like a trader... This isn’t a real case—they pieced it together from thousands of emails."

Industry shock: Verdict may end 'short-selling report' model

Due to its focus on the legal gray zone between short-seller speech and market manipulation, the case has drawn wide attention on Wall Street. According to Australian Financial Review (AFR), some competitors have exited the market since Left was indicted in 2024.

Market reactions to the verdict were mixed.

Former hedge fund manager and short-seller Marc Cohodes posted on X that Left’s conviction "will mark the end of ‘crash-and-profit’ and the short-selling report model," and called on federal authorities to "go after the real offenders behind this behavior." He added, "I like Andrew, always have, it’s tough to see this, but I hate the way these people operate."

Investor Thomas Braziel questioned the verdict, suggesting Left's loss might be linked to his status as a short-seller, "I can’t help but wonder if things would be different if he was bullish—not bearish—people really hate those who bet on things going down." He pointed out that "podcasters, bloggers, X accounts, and bankers constantly stand up for bullish targets." Notably, some charges for which Left was convicted involved stocks where he held long positions.

Left shot to fame with his accurate short call on Valeant Pharmaceuticals in 2015, and has built a large social media following. Prosecutors alleged that from 2018 to 2023, Left reduced the frequency of formal research reports, increasingly relied on tweets to attack stocks and set "extreme" target prices.

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