These 4 Stocks Make Up Nearly 75% of Warren Buffett's Portfolio

Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) CEO Warren Buffett is one of the world's greatest investors. He's overseen the creation of more than $700 billion in shareholder value since becoming CEO in 1965, and has led Berkshire's Class A shares (BRK.A) to an average annual return of greater than 20%. This works out to an aggregate return of better than 3,800,000% since Dec. 31, 1964.

Yet what might surprise investors is that the Oracle of Omaha, as Buffett has come to be known, isn't a big fan of diversification. Even though Berkshire Hathaway's nearly $349 billion investment portfolio held 45 securities as of Sept. 30, nearly three-quarters of the company's invested assets, as of Feb. 6, were tied up in just four stocks.

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

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Source Fool.com