REGN 12-DAY DEADLINE ALERT: Regeneron Pharmaceuticals, Inc. Investors Alerted to September 14, 2026 Lead Plaintiff Deadline in Class Action Lawsuit

A securities class action lawsuit has been filed against Regeneron Pharmaceuticals for allegedly making false and misleading statements about its Phase 3 clinical trial of Fianlimab for melanoma treatment. The company reportedly failed to disclose that preliminary statistical assumptions were flawed and the primary endpoint was unlikely to be achieved. After initially expressing confidence in the trial, Regeneron altered the trial protocol in November 2025 without timely disclosure and ultimately announced on May 15, 2026 that the trial failed to reach statistical significance, resulting in an $11 billion market cap loss.