S&P 500 Gains and Losses Today: Meta Stock Drops After Earnings; Moderna Surges

Meta CEO Mark Zuckerberg on stage at the Meta Connect conference in September. David Paul Morris / Bloomberg via Getty Images Close Key Takeaways Shares of a social media juggernaut slumped as investors balked at its rapidly accelerating spending on artificial intelligence, while reports of potential partnership or buyout talks helped a vaccine maker's shares shoot higher. Chipotle Mexican Grill (CMG) stock fell 18.2%, the most of any S&P 500 component, after the fast-casual burrito chain reported lower-tha ...