A class action lawsuit has been filed against Moonlake Immunotherapeutics on behalf of investors who suffered losses between March 10, 2024 and September 29, 2025. The complaint alleges that the company made false statements and concealed key information regarding its sole drug candidate, SLK. Specifically, it is claimed that SLK and BIMZELX share the same molecular targets, and that SLK's unique Nanobody structure would not deliver superior clinical benefits or efficacy compared to the traditional monoclonal structure of BIMZELX. The lawsuit contends that Moonlake Immunotherapeutics lacked a reasonable basis for its positive statements about SLK's superiority over monoclonal antibodies. The legal action seeks to recover damages for affected investors.