The Basic presumption of reliance in securities fraud class actions allows plaintiffs to assert, for class certification purposes, that they were defrauded when they relied “on the integrity of the price set by the market” for the stock because a misrepresentation purportedly distorted that price. But plaintiffs may invoke the Basic presumption only if the stock traded in an “efficient market” in which the stock price quickly and completely absorbs published information. If that is not the case, the Basic presumption no longer makes sense as there would be no basis for presuming that an alleged misrepresentation distorted the stock price.
In attempting to establish class certification using the Basic presumption, plaintiffs frequently rely on a “corrective disclosure” as the source of price impact. In other words, plaintiffs argue that they have demonstrated price impact based on a corrective disclosure that led to a stock price decline. In this scenario, however, the corrective disclosure presumably must disclose new information. That is because, under the efficient markets theory, confirmatory information—or information already known by the market—will not cause a change in the stock price. If a defendant shows that the corrective disclosure does not reveal new information, then the defendant arguably has severed the link between the alleged misstatement and the stock price drop and the Basic presumption should not be applied.
Two recent unpublished circuit court decisions in high-profile cases have addressed the issue of whether the disclosure of “new” information is required to support the existence of a price impact under the Basic presumption, with results that appear to suggest that there is judicial confusion over how the efficient markets theory should be applied.
In San Diego County Employees Retirement Assoc. v. Johnson & Johnson, 2025 WL 2176586 (3rd Cir. July 30, 2025), the panel reasoned – over a vigorous dissent – that for purposes of assessing price impact under the Basic presumption it “need not decide whether J&J’s assertion that a disclosure must be new is correct” because “disclosures based on public information may nevertheless communicate a new signal to the market in certain situations.” The panel found that the alleged corrective disclosures sent “new signals” to the market that impacted the stock price, even if they did not reveal new information. The defendants sought en banc review of the decision, with significant amicus support, but the Third Circuit did not grant the review (although several judges voted in favor).
In Jaeger v. Zillow Group, Inc., 2025 WL 2741642 (9th Cir. Sept. 26, 2025), the panel rejected the defendants’ argument that an analyst report “did not disclose new information about Zillow’s overpayment for houses” and therefore could not have had a stock price impact. Instead, the panel concluded that even if the information was already public, the “record suggests that this information was not widely discussed or accessible until the [analyst] report was released.” The defendants have obtained an extension on the time to seek a panel rehearing or en banc hearing until October 24, 2025.
It will be interesting to see whether either of these appeals move forward, as it is clear that there needs to be judicial clarification over whether plaintiffs can cite “new signals” or an alleged failure of the information to be “widely discussed” to defeat a defendant’s showing that the alleged corrective disclosure did not contain new information that led to a stock price impact. Stay tuned.
Note: The author of The 10b-5 Daily assisted the Washington Legal Foundation in filing an amicus brief in support of en banc review in the Johnson & Johnson case.

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