If you've ever wondering why more than 40,000 people flock to Berkshire Hathaway's (NYSE: BRK.A)(NYSE: BRK.B) annual shareholder meeting each year, look no further than the track record of longtime CEO Warren Buffett.

Since the affably named "Oracle of Omaha" became CEO in the mid-1960s, he's overseen a greater-than 4,900,000% aggregate return in his company's Class A shares (BRK.A). Returns like these are bound to get money managers noticed on Wall Street.

Although extensive books have been written discussing the "recipe" Buffett has used to grow his wealth and that of Berkshire's long-term shareholders, the one factor that's arguably played the biggest role in his investment success is portfolio concentration.

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Source Fool.com