Celcuity shares fell sharply even as the biotech company reached a major milestone: its first FDA approval. The approval covers a treatment for metastatic breast cancer, marking a significant step for the company as it moves from development into the commercial stage.

A first FDA green light is often seen as a pivotal event for smaller biotech firms, but stock reactions do not always follow the headline news. In Celcuity’s case, investors sent the shares down by double digits despite the regulatory win, underscoring how biotech stocks can be highly volatile around major announcements.

Market moves like this can reflect a gap between expectations and the final outcome, even when the underlying news is positive. Traders may also focus on what comes next, including the challenges of launching a newly approved drug and proving its commercial potential in a competitive market.

The sharp decline shows that FDA approval alone does not always guarantee an immediate rally in biotech shares. For Celcuity, the approval is still a landmark achievement, but the market response suggests investors are weighing the broader business picture alongside the company’s first approved cancer treatment.