91% of Warren Buffett's Portfolio Is in These 4 Sectors

Few investors have a more impressive track record than Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) CEO Warren Buffett. Since taking the reins in 1965, he's created roughly $690 billion in value for his shareholders and delivered an aggregate return for his company's Class A shares (BRK.A) of more than 3,600,000%!

Although there are a number of reasons for the Oracle of Omaha's success over nearly six decades, it's his portfolio concentration that really stands out. Buffett has long believed that diversification is only necessary if you don't know what you're doing.

Berkshire Hathaway CEO Warren Buffett. Image source: The Motley Fool.

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Source Fool.com