AppLovin, Robinhood, and Emcor to Join S&P 500. The Stocks Are Rallying.
1. AppLovin will join the S&P 500 in September. 2. The announcement spurred a 7.7% increase in after-hours trading. 3. APP replaces MarketAxess, Caesars, and Enphase in the index. 4. APP was previously a top candidate for S&P 500 inclusion. 5. S&P 500 rebalancing process impacts APP's market visibility.