AppLovin (APP -1.10%) has been a lightning rod for controversy recently, with three separate short sellers issuing bearish reports on the company this year. However, one billionaire investor was clearly unconvinced by the reports, making AppLovin stock the largest new position in his portfolio during the first quarter.Billionaire Chase Coleman of Tiger Global Management bought nearly $575 million worth of AppLovin stock last quarter, the most he bought of any stock in the period. The stock now represents a ...