If you've ever wondered why professional and everyday investors pay so much attention to Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) CEO Warren Buffett, look no further than his investing track record since becoming CEO in the mid-1960s. Over this nearly six-decade stretch, he's overseen an aggregate return in his company's Class A shares (BRK.A) of better than 4,480,000%, as of the closing bell on Jan. 5. That type of return will get a money manager noticed on Wall Street.

The Oracle of Omaha's not-so-subtle secrets to success have been well documented and include a penchant for buying brand-name, profitable businesses with strong moats that have trusted management teams. But the one factor above all others that's done most of the heavy lifting for Berkshire Hathaway over time is its highly concentrated investment portfolio.

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

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Source Fool.com