LNTH: Other company developments

Item 8.01 Other Events. As previously disclosed, on August 3, 2026, Lantheus Holdings, Inc., a Delaware corporation (“ Lantheus ” or the “ Company ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”) by and among the Company, Curium US Holdings LLC, a Delaware limited liability company (“ Parent ”), and Coco Merger Sub Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“ Merger Sub ”), pursuant to which, subject to the terms and conditions set forth therein, including the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the “ HSR Act ”), Merger Sub will merge with and into the Company (the “ Merger ”), with the Company surviving the Merger as a wholly owned subsidiary of Parent. As part of the parties’ continuing cooperation with the regulatory review of the Merger, on September 17, 2026, Parent, as the acquiring party, in consultation with the Company, voluntarily withdrew its pre-merger Notification and Report Form filed pursuant to the HSR Act, in order to provide the Federal Trade Commission (the “ FTC ”) with additional time to review the Merger. Parent resubmitted its pre-merger Notification and Report Form on September 21, 2026, commencing a new 30-day waiting period under the HSR Act, which will expire on October 21, 2026, at 11:59 p.m., Eastern Time, unless terminated earlier or extended. This statutory waiting period may be extended if the FTC issues a request for additional information and documentary material. Withdrawing and refiling pre-merger notifications is a routine procedure in order to provide additional time for antitrust review of certain transactions. The Company and Parent continue to work constructively with the FTC sta