S&P 500 Gains and Losses Today: Moderna Stock Plunges After Resignation of FDA Vaccine Official
1. Moderna shares fell 8.9% amid FDA vaccine chief's resignation announcement. 2. Peter Marks' departure may affect ongoing COVID-19 vaccine developments. 3. Other vaccine manufacturers also reported losses following the news. 4. Market indices were mixed with a general focus on U.S. trade policies. 5. Investors are cautious ahead of potential reciprocal tariffs.