With Warren Buffett at the helm as chief executive officer and chairman for the last 50-plus years, Berkshire Hathaway has transformed into an investment holding company juggernaut.

With more than 50 positions, there is no shortage of companies with promising growth stories within Berkshire Hathaway's $350 billion investment portfolio. But if I had to pick a stock from the Berkshire portfolio, shares of Visa (NYSE: V) excite me the most. Let's explore the payment processor's fundamentals and valuation to elaborate on why Berkshire Hathaway owns a stake in the company valued at $1.9 billion.

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Source Fool.com