Under the leadership of CEO Warren Buffett, Berkshire Hathaway has delivered market-crushing returns for decades. So investors take notice when Berkshire takes a stake in a company. And the same applies when it eliminates a stock from its portfolio.One stock it recently eliminated in the fourth quarter was the Brazilian fintech StoneCo (STNE 2.00%). The company has gone through some growing pains in recent years, and Berkshire patiently held its stake until the fourth quarter, when it dropped it.Investors m ...