It's no secret that many investors regard Warren Buffett as one of the greatest investors of his time, and he's rightly earned that title. Buffett and his company, Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B), have consistently been part of the cream of the crop when it comes to returns over the years.

While investors who've mirrored Berkshire's portfolio have fared well, its strategy is one you should be cautious of following -- mainly because of how top-heavy its portfolio is.

In Berkshire's most recent 13F filing, it was revealed that its top five holdings accounted for over three-quarters of its stock portfolio.

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Source Fool.com