S&P 500 Gains and Losses Today: Moderna Stock Pops as Execs Buy Shares, Express Cancer Vaccine Optimism
1. Moderna shares surged 15.9%, leading S&P 500 gains on March 5. 2. A top official announced a potential cancer vaccine release in 2027. 3. CEO's $5 million stock purchase signals strong internal confidence. 4. U.S. stock markets rebounded after easing tariff concerns. 5. S&P 500 overall rose 1.1% in midweek trading session.