Levi & Korsinsky Announces Investigation of Securities Claims Against Regeneron Pharmaceuticals, Inc. (REGN)

NEW YORK, May 21, 2026 (GLOBE NEWSWIRE) -- Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) lost significant market capitalization on May 16, 2026, when the Company disclosed that its Phase 3 melanoma trial of fianlimab combined with Libtayo failed to meet its primary endpoint versus Merck's Keytruda. Shareholders who lost money on REGN are encouraged to submit their information here.