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 or concealed 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 does not provide a superior clinical benefit or increased tissue penetration compared to traditional monoclonal antibodies. As a result, the lawsuit contends that the company lacked a reasonable basis for its positive statements about SLK's purported advantages over monoclonal antibodies. Investors who believe they were affected by these actions are encouraged to seek legal advice.