Occidental Petroleum (NYSE: OXY) is a $53.3 billion exploration and production company headquartered in Houston, Texas. It isn't the size of Apple, Bank of America, American Express, Coca-Cola, or Chevron (NYSE: CVX) -- Berkshire Hathaway's (NYSE: BRK.A) (NYSE: BRK.B) top five holdings (all have a market cap over $150 billion).

Yet, Berkshire has invested over $15 billion in Oxy, owning a staggering 28.2% of the entire company. Five years ago, Berkshire owned no Oxy stock.

At this rate, it would be easy to assume that Buffett and his team would buy out the whole company. But Buffett sent a clear message that this wouldn't be the case. Here's why.

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Source Fool.com