INVESTOR ALERT: Berger Montague Advises MoonLake Immunotherapeutics (NASDAQ: MLTX) Investors to Inquire About a Securities Fraud Class Action by December 15, 2025

Core Viewpoint - A class action lawsuit has been filed against MoonLake Immunotherapeutics for allegedly misleading investors regarding the efficacy of its drug candidate, sonelokimab (SLK), which reportedly failed to meet clinical benchmarks [1][3][4]. Company Overview - MoonLake Immunotherapeutics is a clinical-stage biotech firm based in Zug, Switzerland, focusing on next-generation immunotherapies [2]. Legal Proceedings - The lawsuit is on behalf of investors who purchased MoonLake shares between March 10, 2024, and September 29, 2025, with a deadline of December 15, 2025, for investors to seek lead plaintiff status [1][2]. Drug Candidate Details - MoonLake promoted SLK as a breakthrough treatment due to its Nanobody structure but allegedly failed to disclose that it targets the same molecules as BIMZELX, an FDA-approved monoclonal antibody, indicating it was not clinically superior [3]. Trial Results and Market Impact - On September 28, 2025, MoonLake disclosed that SLK did not meet efficacy benchmarks in Phase 3 trials, leading to a significant stock price decline of $55.75 per share, nearly 90%, in one trading session [4].