Most investors would shy away from a highly-concentrated 20 stock portfolio. Many studies show that when it comes to investing, diversification is the name of the game. One bad pick in a concentrated portfolio can overhang investment performance for years.

But while research shows that the average investor should try to diversify away risk, many professional investors have made a name for themselves running an extremely concentrated portfolio. For example, Warren Buffett, Charlie Munger, Bill Ackman, Michael Larson, Glenn Greenberg and a number of the

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