The United States Court of Appeals for the Fourth Circuit recently joined a growing consensus among federal appellate courts: short-seller reports, without more, rarely suffice to plead loss causation under the federal securities laws. In Defeo v. IonQ, Inc., 2025 U.S. App. LEXIS 8216, ___ F.4th ___ (4th Cir. Apr. 8, 2025), the Court held that a report by activist short-seller Scorpion Capital — which coincided with a significant stock price drop — did not constitute a corrective disclosure revealing previously concealed fraud to the market. The opinion aligns the Fourth Circuit with decisions from the Ninth Circuit, which have similarly found that loss causation cannot rest on short-seller publications that are speculative, anonymously sourced and heavily disclaimed.