MoonLake Immunotherapeutics

On October 15, 2025, a lawsuit captioned Bridgewood v. MoonLake Immunotherapeutics, et al., Case No. 1:25-cv-8500 (the “Bridgewood Action”) was filed in the United States District Court for the Southern District of New York, naming the Company, its Chief Executive Officer, and its Chief Financial Officer as defendants. The Bridgewood Action was purportedly brought on behalf of a class of all investors who purchased or otherwise acquired the Company’s common stock between March 10, 2024, through September 29, 2025. The complaint alleged claims under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended (“Exchange Act”), based on allegedly false or misleading statements related to the clinical benefits and prospects of sonelokimab. The lawsuit sought unspecified damages and other relief. On October 22, 2025, the plaintiff voluntarily dismissed without prejudice the Bridgewood Action.

On October 17, 2025, a second putative class action captioned Peters v. MoonLake Immunotherapeutics, et al., Case No. 1:25-cv-8612 (the “Peters Action” and, together with the Bridgewood Action, the “Class Actions”) was filed in the United States District Court for the Southern District of New York. The Peters Action names the same defendants, contains identical allegations of alleged violations of the Exchange Act, and seeks the same relief as the Bridgewood Action.

The defendants deny the allegations of wrongdoing in the Class Actions and intend to vigorously defend against the claims. The Company is unable to predict the ultimate outcome of the Peters Action and therefore cannot estimate the reasonably possible loss or range of loss, if any, that may result from the lawsuit.