SAN FRANCISCO, Aug. 05, 2026 (GLOBE NEWSWIRE) -- Hagens Berman Sobol Shapiro LLP alerts investors in Regeneron Pharmaceuticals (NASDAQ: REGN) that a securities class action lawsuit has been filed after its surprising revelations concerning a Phase 3 clinical trial of a therapy intended to treat patients with melanoma. The news that the trial failed drove the price of Regeneron shares sharply lower and, along with the severe market reaction ($11 billion market cap wipeout), triggered the lawsuit which seeks to represent investors who purchased or otherwise acquired shares of Regeneron common stock between August 1, 2025 and May 15, 2026.