{"id":982546,"date":"2026-07-17T12:32:01","date_gmt":"2026-07-17T16:32:01","guid":{"rendered":"https:\/\/www.marketnewsdesk.com\/index.php\/gainey-mckenna-egleston-announces-a-class-action-lawsuit-has-been-filed-against-regeneron-pharmaceuticals-inc-regn-2\/"},"modified":"2026-07-17T12:32:01","modified_gmt":"2026-07-17T16:32:01","slug":"gainey-mckenna-egleston-announces-a-class-action-lawsuit-has-been-filed-against-regeneron-pharmaceuticals-inc-regn-2","status":"publish","type":"post","link":"https:\/\/www.marketnewsdesk.com\/index.php\/gainey-mckenna-egleston-announces-a-class-action-lawsuit-has-been-filed-against-regeneron-pharmaceuticals-inc-regn-2\/","title":{"rendered":"Gainey McKenna &amp; Egleston Announces A Class Action Lawsuit Has Been Filed Against Regeneron Pharmaceuticals, Inc. (REGN)"},"content":{"rendered":"<div class=\"mw_release\">\n<p align=\"justify\">NEW YORK, July  17, 2026  (GLOBE NEWSWIRE) &#8212; Gainey McKenna &amp; Egleston announces that a securities class action lawsuit has been filed in the United States District Court for the Southern District of New York on behalf of all persons or entities who purchased or otherwise acquired Regeneron Pharmaceuticals, Inc. (\u201cRegeneron\u201d or the \u201cCompany\u201d) (NASDAQ: REGN) securities between August 1, 2025 and May 15, 2026, inclusive (the \u201cClass Period\u201d).<\/p>\n<p align=\"justify\">The Complaint alleges that Defendants made materially false and misleading statements regarding the true state of Regeneron\u2019s Phase III Fianlimab-Libtayo Study; notably, that its preliminary statistical assumptions were fundamentally flawed, that the active treatment arm was failing to achieve meaningful clinical differentiation over standard therapies, and that the trial would ultimately fail to reach statistical significance on its primary endpoint even without overperformance of the control arm. Such statements absent these material facts caused Plaintiff and other shareholders to purchase Regeneron\u2019s securities at artificially inflated prices.<\/p>\n<p align=\"justify\">The Complaint alleges that the full truth finally emerged after-market on May 15, 2026, when Regeneron issued a press release announcing that the \u201cPhase 3 Trial of Fianlimab . . . did not reach statistical significance for the primary endpoint of improvement in progression-free survival (PFS).\u201d<\/p>\n<p align=\"justify\">The Complaint also alleges that the investors and analysts again reacted promptly to Regeneron\u2019s revelation. The Complaint continues to allege that the price of Regeneron\u2019s common stock declined even further from a closing market price of $698.25 per share on May 15, 2026, Regeneron\u2019s stock price fell to $629.68 per share on May 18, 2026, a decline of about 9.8% in the span of one day.<\/p>\n<p align=\"justify\">Investors who purchased or otherwise acquired shares of Regeneron should contact the Firm<strong><em> prior to the September 14, 2026 <\/em><\/strong>lead plaintiff motion deadline. A lead plaintiff is a representative party acting on behalf of other class members in directing the litigation. If you wish to discuss your rights or interests regarding this class action, please contact Thomas J. McKenna, Esq. or Gregory M. Egleston, Esq. of Gainey McKenna &amp; Egleston at (212) 983-1300, or via e-mail at\u00a0<a href=\"https:\/\/www.globenewswire.com\/Tracker?data=Iyshn9jBpWi2Re6f9U-V9_u1I5VbdxCz7y_8U-saIuDzH1ig9-2dzy5fm-Sgwd8NmR8azpaAR_ZcCQtRlwVPaLg44KwtldK1U2vRcs70Tq4=\" rel=\"nofollow\" target=\"_blank\"><u>tjmckenna@gme-law.com<\/u><\/a> or <a href=\"https:\/\/www.globenewswire.com\/Tracker?data=7hL67hSyx1zJ9lRIX4FJUUVPpLh8_3pfbkLt8w_ZPrke1UHDkCK0uiSIzsJxtX6lbJaz654aJSKEfRoBRRh8O3JiUOuD7d_DmnEu-YjOpak=\" rel=\"nofollow\" target=\"_blank\"><u>gegleston@gme-law.com<\/u><\/a>.<\/p>\n<p align=\"justify\">Please visit our website at <a href=\"https:\/\/www.globenewswire.com\/Tracker?data=iCJwH6UlooIgSu9Fk80DNEwQ_hoKTZSr76hvnpTUFIpsz0vFTqUdQbSR-AwN-G5FJZQLUegEss16CNx8DAe-GSTFLi-QHlioYLhBXrmjV5M=\" rel=\"nofollow\" target=\"_blank\"><u>http:\/\/www.gme-law.com<\/u><\/a> for more information about the firm.<\/p>\n<p>      <img decoding=\"async\" alt=\"\" class=\"__GNW8366DE3E__IMG\" src=\"https:\/\/www.globenewswire.com\/newsroom\/ti?nf=OTc2NDA1NCM3NzExMzk1IzIwMTc3MDQ=\" \/><br \/>\n      <br \/>\n      <img decoding=\"async\" alt=\"\" src=\"https:\/\/ml.globenewswire.com\/media\/OGZkMGNmNDItZDZmNy00ZDhmLThkZDgtZjZmNjk3YzI0M2VkLTEwMjkyNzQtMjAyNi0wNy0xNy1lbg==\/tiny\/Gainey-McKenna-Egleston.png\" \/>\n    <\/div>\n<div class=\"mw_contactinfo\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>NEW YORK, July 17, 2026 (GLOBE NEWSWIRE) &#8212; Gainey McKenna &amp; Egleston announces that a securities class action lawsuit has been filed in the United States District Court for the Southern District of New York on behalf of all persons or entities who purchased or otherwise acquired Regeneron Pharmaceuticals, Inc. (\u201cRegeneron\u201d or the \u201cCompany\u201d) (NASDAQ: REGN) securities between August 1, 2025 and May 15, 2026, inclusive (the \u201cClass Period\u201d). The Complaint alleges that Defendants made materially false and misleading statements regarding the true state of Regeneron\u2019s Phase III Fianlimab-Libtayo Study; notably, that its preliminary statistical assumptions were fundamentally flawed, that the active treatment arm was failing to achieve meaningful clinical differentiation over standard therapies, and that the trial would ultimately &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.marketnewsdesk.com\/index.php\/gainey-mckenna-egleston-announces-a-class-action-lawsuit-has-been-filed-against-regeneron-pharmaceuticals-inc-regn-2\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Gainey McKenna &amp; Egleston Announces A Class Action Lawsuit Has Been Filed Against Regeneron Pharmaceuticals, Inc. (REGN)&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-982546","post","type-post","status-publish","format-standard","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gainey McKenna &amp; Egleston Announces A Class Action Lawsuit Has Been Filed Against Regeneron Pharmaceuticals, Inc. (REGN) - Market Newsdesk<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.marketnewsdesk.com\/index.php\/gainey-mckenna-egleston-announces-a-class-action-lawsuit-has-been-filed-against-regeneron-pharmaceuticals-inc-regn-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Gainey McKenna &amp; Egleston Announces A Class Action Lawsuit Has Been Filed Against Regeneron Pharmaceuticals, Inc. (REGN) - Market Newsdesk\" \/>\n<meta property=\"og:description\" content=\"NEW YORK, July 17, 2026 (GLOBE NEWSWIRE) &#8212; Gainey McKenna &amp; Egleston announces that a securities class action lawsuit has been filed in the United States District Court for the Southern District of New York on behalf of all persons or entities who purchased or otherwise acquired Regeneron Pharmaceuticals, Inc. (\u201cRegeneron\u201d or the \u201cCompany\u201d) (NASDAQ: REGN) securities between August 1, 2025 and May 15, 2026, inclusive (the \u201cClass Period\u201d). The Complaint alleges that Defendants made materially false and misleading statements regarding the true state of Regeneron\u2019s Phase III Fianlimab-Libtayo Study; notably, that its preliminary statistical assumptions were fundamentally flawed, that the active treatment arm was failing to achieve meaningful clinical differentiation over standard therapies, and that the trial would ultimately &hellip; Continue reading &quot;Gainey McKenna &amp; Egleston Announces A Class Action Lawsuit Has Been Filed Against Regeneron Pharmaceuticals, Inc. 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