CHONGQING, CHINA - OCTOBER 31: The Regeneron webpage is displayed on a smartphone in front of the ... More Regeneron Pharmaceuticals, Inc. logo on October 31, 2024 in Chongqing, China. (Photo by Cheng Xin/Getty Images)Getty Images Regeneron Pharmaceuticals (NASDAQ:REGN) shares witnessed a notable 19% decline on Friday, May 30, in the wake of the unexpected failure of itepekimab, its chronic obstructive pulmonary disease (COPD) treatment in conjunction with Sanofi, during a late-stage clinical trial. One of ...