REGN INVESTOR ALERT: Regeneron Pharmaceuticals, Inc. Investors with Substantial Losses Have Opportunity to Lead the Regeneron Class Action Lawsuit

Purchasers or acquirers of Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) common stock between August 1, 2025 and May 15, 2026, inclusive (the "Class Period"), have until September 14, 2026 to seek appointment as lead plaintiff of the Regeneron class action lawsuit. Captioned Cheatham v. Regeneron Pharmaceuticals, Inc., No. 26-cv-06026 (S.D.N.Y.), the Regeneron class action lawsuit charges Regeneron and certain of Regeneron's top executives with violations of the Securities Exchange Act of 1934.

Regeneron is a pharmaceutical company that discovers, invents, develops, manufactures, tests, and commercializes medicines to treat various disorders worldwide. The Regeneron class action lawsuit alleges that defendants throughout the Class Period made false and/or misleading statements and/or failed to disclose that: (i) defendants created the false impression that they possessed reliable information demonstrating that Regeneron's Phase III Fianlimab-Libtayo Study was well-poised for success, while minimizing risks to the study's odds of achieving its primary endpoint and its overall statistical validity arising from the prolonged event rate slowdown; (ii) Regeneron's preliminary statistical assumptions were fundamentally flawed; (iii) the active treatment arm was failing to achieve meaningful clinical differentiation over standard therapies; and (iv) the trial would ultimately fail to reach statistical significance on its primary endpoint even without overperformance of the control arm.

On April 29, 2026, during Regeneron's first quarter earnings call, defendants allegedly disclosed that the Phase III Fianlimab-Libtayo Study had been altered, expanding the number of patients in the study eligible for "analysis of progression-free survival." On this news, the price of Regeneron stock declined more than 6%, according to the complaint.

Then, after-market on May 15, 2026, Regeneron issued a press release allegedly announcing that the "Phase 3 Trial of Fianlimab . . . did not reach statistical significance for the primary endpoint of improvement in progression-free survival (PFS)." On this news, the price of Regeneron stock dropped nearly 10%, according to the complaint.

The Private Securities Litigation Reform Act of 1995 permits any investor who purchased or acquired Regeneron common stock during the Class Period to seek appointment as lead plaintiff in the Regeneron class action lawsuit. A lead plaintiff is generally the movant with the greatest financial interest in the relief sought by the putative class who is also typical and adequate of the putative class. A lead plaintiff acts on behalf of all other class members in directing the Regeneron class action lawsuit. The lead plaintiff can select a law firm of its choice to litigate the Regeneron class action lawsuit. An investor's ability to share in any potential future recovery is not dependent upon serving as lead plaintiff of the Regeneron class action lawsuit.