Lantheus (LNTH) Dives 6.78% as Class-Action Lawsuits Emerge, Shares Drop 6.97% in Two Days

Lantheus Holdings Inc. (LNTH) fell to its lowest level so far this month on Nov. 7, with an intraday decline of 6.78%. The stock has dropped 6.97% over two consecutive trading days, extending a downward trend that reflects growing investor concerns over legal and market-related risks.

The company is facing multiple overlapping class action lawsuits alleging securities law violations, with shareholders accusing Lantheus of misrepresenting the market position and financial prospects of its flagship product, Pylarify. The suits, filed between Feb. 26 and Aug. 5, 2025, claim the firm overstated Pylarify’s market leadership while downplaying competitive pressures and declining sales. Plaintiffs argue that internal awareness of weakening dynamics was concealed, creating a “false impression” of growth potential and pricing stability.

Legal risks loom large, with allegations spanning violations of the Securities Exchange Act of 1934 and potential SEC investigations. The lawsuits highlight a sharp decline in Pylarify’s sales throughout 2025, attributed to eroding market share, pricing pressures, and macroeconomic factors. These developments have fueled stock volatility, as investors reassess the company’s valuation amid heightened uncertainty. The litigation, with a lead plaintiff deadline on Nov. 10, underscores prolonged legal exposure that could further pressure sentiment, even as the firm navigates broader governance and competitive challenges.