Paul Weiss Discusses Ninth Circuit Dismissal of Securities Fraud Claims on Loss Causation Grounds

Key Takeaways

• Ninth Circuit upheld dismissal of Comerica fraud claims on loss causation
• Stock dropped 7.4% over two days, deemed modest and typical
• Recovery within two days and stayed above pre‑disclosure price for four months
• Courts weigh size, typicality, and quick recovery for loss causation

Pulse Analysis

Loss causation remains a pivotal element of securities‑fraud litigation under the 1934 Exchange Act, requiring plaintiffs to link a misstatement directly to their economic loss. The Ninth Circuit imposes Rule 9(b)’s heightened pleading standard, demanding particularity about how a disclosure caused a stock decline. Courts therefore scrutinize the magnitude, normalcy, and duration of any price movement following a corrective disclosure, rejecting claims where the drop is modest or aligns with the issuer’s usual volatility.

The recent Comerica ruling exemplifies this rigorous approach. Plaintiffs cited a May 2023 article that allegedly revealed compliance violations, triggering a 7.4% two‑day decline. The Ninth Circuit found the dip fell short of the informal 10% benchmark established in *Metzler*, was within Comerica’s typical price fluctuations, and rebounded within two days, staying above the pre‑article level for months. By applying the three‑factor test—size, typicality, and rapid recovery—the court affirmed the dismissal, underscoring that modest, short‑lived drops do not satisfy loss‑causation.

For practitioners, the decision signals that defendants can aggressively challenge loss‑causation at the pleading stage by highlighting modest declines and swift recoveries. Litigation strategies should now include detailed statistical analyses of an issuer’s historical price volatility surrounding alleged disclosures. While the Ninth Circuit’s approach may eventually influence other jurisdictions, defendants outside the circuit already have a strong basis to adopt similar arguments, potentially reshaping the landscape of securities‑fraud class actions nationwide.