Berkshire Hathaway is a turbulent investment.

Denver It’s the most expensive stock in the world, yet analysts currently think it’s undervalued. Berkshire Hathaway’s Class A shares cost $432,000. If you add up the value of all parts of the company, including the stock portfolio worth over $300 billion, then the paper should be worth almost 20 percent more, believes Whitney Tilson, founder of the analysis company Empire Research. He closely monitors the so-called intrinsic value of the stock – and therefore recommends buying it.