Regeneron Pharmaceuticals IncSecurities fraud lawsuit alleging misrepresentations about Phase III trial results, causing stock drops.

A class action lawsuit has been filed against Regeneron Pharmaceuticals for securities fraud, alleging the company misled investors about the success of its Phase III Fianlimab-Libtayo clinical trial. The suit, filed in the U.S. District Court for the Southern District of New York, claims Regeneron executives made false statements about the trial's potential to show meaningful differentiation against current standards of care, despite knowing the study did not achieve statistically significant results. On April 29, 2026, Regeneron stock fell 6.2% after the company expanded study parameters, and on May 15, 2026, it dropped another 9.8% following a press release confirming the trial missed its primary endpoint. Investors have until September 14, 2026, to seek lead plaintiff appointment in the case, which is captioned Cheathem v. Regeneron Pharm., Inc., et al., No. 26-cv-6026.
Regeneron Pharmaceuticals IncSecurities fraud lawsuit alleging misrepresentations about Phase III trial results, causing stock drops.