Billionaires Warren Buffett and David Tepper and "Big Short" Investor Michael Burry Just Bought UnitedHealth Group Stock. Should You? Buffett, Tepper, and Burry bought shares of UnitedHealth Group in Q2. The stock is popular with these wealthy investors because of its attractive valuation.

Berkshire Hathaway's $1.6 billion stake in UnitedHealth Group is helping to lift the Dow Jones Industrial Average to a new record as investors pile into healthcare sector funds.

So while we should always try to assess where a stock or sector is headed, the better way to trade is with a simple framework: Any stock can go up and thus be a source of profits. However, owning each stock comes with different levels of risk,