Warren Buffett isn't as diversified as you might think. Sure, his Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) portfolio includes over 50 stocks. However, one of those stocks (which happens to be named after a certain red fruit) comprises nearly 48% of Berkshire's total holdings.

But that's not the only example of the legendary investor's lower level of diversification. There are seven stocks in Buffett's portfolio that have close ties to each other via another stock that he doesn't own. 

Berkshire owns three sets of "twins." First, there's Liberty Latin America Series A (NASDAQ: LILA) and Liberty Latin America Series C (NASDAQ: LILA.K). The two stocks represent different share classes of the same underlying business -- Liberty Latin America.

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Source Fool.com