
Courts have shown a growing skepticism toward plaintiffs’ use of short-seller reports to plead loss causation for securities claims. Recent decisions have increasingly dissected when a short-seller report will fail to survive attacks from a motion to dismiss. This article will address recent case developments across various circuits before addressing the key takeaways from this narrowing trend.
Short-Seller Reports: A Primer
Short selling is a stock-trading method in which traders make money from stock prices declining. A trader is considered “short” on stock when it borrows stock to sell on the market with the goal of buying that stock back once it decreases—the difference between the initial sale price and the subsequent purchase price is the profit that the trader makes. Short selling is both an asset to the market and a potential tool for manipulation because it encourages greater market research by investors who stand to make a profit from stock prices declining.
Short sellers can publish reports (“short-seller reports”) detailing information on a company, including reasons that the company’s stock may decline, which can negatively affect the confidence in, reputation of, and overall stock price of the company. If a short-seller report has negative information about a company that impacts market opinion, short sellers profit from the declining stock price. Therefore, short sellers have a financial incentive to detect and publish fraud in the market, a potential bias when facing profit-making opportunities.
Shareholder-plaintiffs filing federal securities claims have used short-seller reports to plead loss causation, an element of securities claims referring to a causal connection between the alleged material misrepresentation and the actual loss to the company’s shareholders. Loss causation allegations are reviewed “for ‘sufficient specificity,’ a standard ‘largely consonant with Fed. R. Civ. P. 9(b)’s particularity requirement.”[1]
Until recently, courts have generally permitted using short-seller reports to plead a “corrective disclosure” to allege loss causation when a report provides new information to the market that purportedly reveals a company’s fraudulent behaviors or misrepresentations. However, federal courts nationwide are increasingly limiting the use of short-seller reports to plead loss causation where the reports use confidential or anonymous informers, disclaim editorial creativity, or fail to add new information to the market.
Recent Case Developments in the Use of Short-Seller Reports
Recently, courts have been highlighting concerns over the content of short-seller reports, impacting their use by plaintiffs to plead securities claims.
For example, in Defeo v. IonQ, Inc., shareholders of IonQ, Inc. (“IonQ”) brought a federal securities putative class action against IonQ, dMY Technology Group, Inc., and related officers from both entities in the U.S. District Court for the District of Maryland, alleging violations of section 10(b) of the Securities Exchange Act of 1934 and Rule 10b-5 for materially false or misleading statements in connection with a merger.[2] The suit followed an online short-seller report published one year after the merger agreement, claiming that IonQ was a scam based on its misstatements concerning the capabilities of IonQ’s technology, which the plaintiffs argued caused the stock price to drop 6.7 percent. However, the report quoted from an anonymous alleged ex-employee and disclaimed that parts “may be paraphrased, truncated, and/or summarized solely at [the short seller’s] discretion, and do not always represent a precise transcript of those conversations.”[3]
The defendants moved to dismiss for failure to state a claim, which the district court granted, finding that an anonymously sourced report disclaiming its own accuracy cannot support loss causation. On appeal, the U.S. Court of Appeals for the Fourth Circuit affirmed the district court’s ruling on the motion to dismiss, stating that “the Shareholders here fail[ed] to clear the high bar of showing that the [short-seller report] revealed the truth of IonQ’s alleged fraud to the market” because the short-seller report relied on anonymous sources for nonpublic information and disclaimed that the source material was subject to creative input.[4]
The Fourth Circuit was persuaded by the Ninth Circuit’s recent decision, In re BofI Holding, Inc. Securities Litigation, expressing concerns about anonymous and biased interests of short sellers.[5] In re BofI addressed whether blog posts published online by anonymous short sellers that disclaimed the post’s accuracy would qualify as a corrective disclosure for loss causation.[6] The Ninth Circuit held that anonymous blog posts cannot plead a corrective disclosure where the authors disclaimed potential inaccuracies and stood to financially gain from declining stock prices.
Other district courts have expressed similar concerns regarding anonymous or confidential informants because shareholder-plaintiffs have difficulty pleading the truth with the requisite specificity necessary to survive a motion to dismiss.
In MacPhee v. MiMedx Group, Inc., the Eleventh Circuit similarly emphasized that short-seller reports cannot be used as a basis for corrective disclosures where the reports utilize public information—that is, the court found that the information has to be new to the market to be considered “corrective.”[7] In MacPhee, multiple reports were published addressing MiMedx’s fraudulent scheme to artificially inflate its sales to provide “revenue injections.”[8] The court held that repackaging public information is not enough to qualify a short-seller report as a corrective disclosure where it disclaims that it “only repeated information already in the public domain,” despite the stock potentially dropping in response to the negative reports.[9]
This reasoning was the basis for the U.S. District Court for the Central District of California’s decision in In re Genius Brands International, Inc. Securities Litigation.[10] There, the court partially granted dismissal on the defendants’ motion to dismiss where one of the plaintiff’s claims was based on an alleged misstatement that the company had never hired anyone to solicit its securities, which a short-seller report refuted and the hired third party confirmed. However, the court held that the short-seller report was insufficient to plead loss causation because it only contained easily accessible public information and directly touched on the misstatement at issue.
The U.S. District Court for the Southern District of New York held similarly in In re Ideanomics, Inc. Securities Litigation. In In re Ideanomics, the lead shareholder-plaintiff brought claims under sections 10(b) and 20(a) of the Securities Exchange Act alongside Rule 10b-5(b) against defendants Ideanomics, Inc., and its relevant officers and director.[11] Two short sellers issued a report and tweets regarding Ideanomics, which the plaintiff alleged revealed multiple misstatements in Ideanomics’s public press releases, earnings calls, and interviews with the individual defendants. The defendants moved to dismiss the securities claims for failure to state a claim, arguing in part that loss causation was not adequately alleged where the two short-seller reports were not corrective disclosures. The two short-seller reports failed to disclose any actual undisclosed facts. The court further elaborated that a photograph of the company’s site published by one short seller, the only part of the report that could potentially qualify as an undisclosed fact, was too attenuated from the stock price decline. The complaint failed to allege any reliance on the photograph to cause the drop in stock price and provided no explanation for why the stock price increased in the days following its initial decline after the short-seller reports were published. The court subsequently granted the motion to dismiss, in part because of the plaintiff’s failure to adequately plead loss causation where the short-seller reports did not publish undisclosed facts.
However, some courts still find the reliability of short-seller reports to be a “question of fact” and not to be decided on a motion to dismiss.[12]
For example, in Saskatchewan Healthcare Employee’s Pension Plan v. KE Holdings Inc., the Southern District of New York found that the short-seller report pled to support loss causation was sufficiently reliable to deny the motion to dismiss.[13] The district court stated that courts in the Southern District of New York frequently accepted short-seller reports at the pleading stage, where the issue is whether “there is a basis to view the short seller’s factual allegations as reliable as opposed to fabricated on self-interest,” which is “[ultimately] a question of fact.”[14]
However, the short seller at issue not only created a program to analyze data published by the company but also provided a step-by-step analysis of its findings. The report also did not utilize confidential sources for information. The court found that because “the Report cites facts that ‘tend to substantiate these allegations or reveal the basis for the short-seller’s factual assertions,’” it provided “sufficiently reliable support” for the shareholder-plaintiff’s claims.[15] This impliedly supports the current narrowing trend regarding short-seller reports, requiring plaintiffs to use new, reliable, and accurate short-seller reports to survive a motion to dismiss.
Key Takeaways
Generally, courts express greater skepticism toward short-seller reports used to allege loss causation where the reports are not pled with specificity to determine the veracity of their sources, and courts will grant motions to dismiss on this basis. This is particularly true when the information in the report is (1) not “new” to the market, (2) stems from an anonymous or confidential source, and (3) disclaims the editorial freedom taken with its drafting. Short-seller reports will likely continue to be permitted to support loss causation allegations at the motion to dismiss stage in circumstances where the report is adequately pled to allege its accuracy and provides new information to the market that could verify alleged wrongdoing by the company.
This trend requires shareholder-plaintiffs to exercise caution using short-seller reports to plead loss causation for securities claims, encouraging the use of more established and well-detailed short-seller reports. Defendants should analyze short-seller reports used to plead loss causation for discrepancies, including analyzing the report’s utilization of information in the public domain, the reliability of the report’s sources for information, and disclaimers provided by the short seller as potential avenues to seek early dismissal of such claims.
Defeo v. IonQ, Inc., 134 F.4th 153 (4th Cir. 2025). ↑
Id. ↑
Id. at 159. ↑
Id. at 163. ↑
In re BofI Holding, Inc. Sec. Litig., 977 F.3d 781 (9th Cir. 2020). ↑
Id. at 797. ↑
MacPhee v. MiMedx Grp., Inc., 73 F.4th 1220, 1246 (11th Cir. 2023) (reaffirming Meyer v. Greene, 710 F.3d 1189, 1199 (11th Cir. 2013)). ↑
Id. at 1230. ↑
Id. at 1246. ↑
In re Genius Brands Int’l, Inc. Sec. Litig., 763 F. Supp. 3d 1027, 1039–41, 1046 (C.D. Cal. 2025). ↑
In re Ideanomics, Inc., Sec. Litig., No. 20 Civ. 4944 (GBD), 2022 WL 784812, at *1 (S.D.N.Y. Mar. 15, 2022). ↑
Saskatchewan Healthcare Emp.’s Pension Plan v. KE Holdings Inc., 718 F. Supp. 3d 344, 382 (S.D.N.Y. 2024). ↑
718 F. Supp. 3d 344. ↑
Id. at 382. ↑
Id. (quoting In re Hebron Tech. Co., Ltd. Sec. Litig., 2021 WL 4341500, at *13 (S.D.N.Y. Sept. 22, 2021)). ↑