For nearly six decades, Berkshire Hathaway CEO Warren Buffett has been dazzling Wall Street with his investing prowess. Through the closing bell on Nov. 17, the Oracle of Omaha has overseen a nearly 4,400,000% aggregate return in his company's Class A shares (BRK.A).

Buffett's success is often attributed to his long-term ethos and love of time-tested, brand-name businesses. But not nearly enough credit is given to his penchant for portfolio concentration. Though Berkshire Hathaway holds stakes in more than four dozen securities, Buffett strongly believes that his and his investment teams' best ideas should receive added weighting.

Let's make one thing very clear: I'm no Warren Buffett. I don't have his bankroll or roughly eight decades of experience as an investor.

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Source Fool.com