Warren Buffett’s Berkshire Hathaway just bought one of my favorite stocks. Is it time to pile in?

This article was originally published on Fool.com. All figures quoted in US dollars unless otherwise stated. Any time Warren Buffett’s Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) adds a new investment to its stock portfolio, it tends to grab attention. And because Berkshire has been much more of a seller of stocks than a buyer of them over the past two years, the company’s portfolio additions are likely to draw even more interest. Berkshire’s latest Form 13F filing revealed that in the third quarter, the conglomerate opened an approximately $5 billion position in Alphabet (NASDAQ: GOOGL) (NASDAQ: GOOG), which also happens…