Key Takeaways AppLovin shares jumped more than 20% in pre-market trading Thursday after the app development company topped analysts' quarterly earnings and sales estimates, issued upbeat first-quarter guidance and announced an expansion of its stock buyback program. The company attributed the better-than-expected quarterly results to a strong holiday season, growth in the mobile app advertising market, and bidding enhancements to its platform. Further upside in the AppLovin share price may meet chart resist ...