Citigroup upgraded AppLovin (NASDAQ:APP) to a "Buy" rating, with the stock reaching new highs and being added to the S&P 500 index.AppLovin reported a 77% year-over-year increase in revenue and an 81% margin in adjusted EBITDA, showcasing strong financial growth.The company's stock price has seen significant gains in 2025, driven by innovative ad-technology solutions and anticipation of new products.On October 1, 2025, Citigroup upgraded AppLovin (NASDAQ:APP) to a "Buy" rating, with the stock priced at $718 ...