Why is Moderna stock plunging today?

Merck and Moderna are both experiencing significant stock price declines today. Investors are reacting to specific market pressures affecting these pharmaceutical giants, leading to a downward trend in their share values. While Merck faces its own set of challenges causing the slide, Moderna is seeing its stock plunge sharply. Both companies are currently under pressure as market participants evaluate the latest financial data and industry developments impacting their respective valuations in the current trading session.