If you've ever wondered why investors pay so much attention to what Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) CEO Warren Buffett is buying and selling, I can offer nearly 3.8 million reasons.

Since the Oracle of Omaha took over the role of CEO in 1965, he's created more than $680 billion in value for his company's shareholders (himself included) and delivered an aggregate return on Berkshire's Class A shares (BRK.A) of 3,787,464%. That's 153 times better than the 24,708% total return, including dividends paid, for the widely followed S&P 500 over the same stretch.

Investors are constantly dissecting Buffett's strategy with the hope of replicating even a fraction of his outperformance. While many of Buffett's investing traits are well known and credited for his success, such as buying for the long haul and gravitating to dividend stocks, it's his penchant for portfolio concentration that's really paid off.

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Source Fool.com