Many consider Warren Buffett one of the most successful investors of all time. His holding company, Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B), has grown to become one of the world's largest corporations. Berkshire is famous for its tremendous diversification across different businesses, industries, and stocks while having a massive balance sheet flush with cash at nearly all times.

The stock has outperformed the S 500 on average throughout its lifetime, so investors who have bought and held have done well.

But it might not be that simple now. Berkshire recently announced its second-quarter earnings, which included some potential warning signs telling investors to stay away, at least for now.

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Source Fool.com