Warren Buffett is one of the most successful investors of all time. Therefore, when his holding company Berkshire Hathaway adds to a stock holding, it's often because of sound reasoning.

In the second quarter, the company upped its position in the pharmaceutical and medical-supplies distributor McKesson (NYSE: MCK). Berkshire Hathaway added 276,369 shares to its position in the company, to bring its total position to nearly 3.2 million shares.

Should you add McKesson to your portfolio? Let's dig into the company's fundamentals and valuation to answer that question.

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Source Fool.com