Many consider Warren Buffett to be the greatest investor ever. His track record leading Berkshire Hathaway certainly makes a strong case. Today, there are dozens of stocks among the company's public equities holdings. 

Among the top five positions that the Oracle of Omaha owns through his conglomerate, investors will see American Express (NYSE: AXP). This leading card issuer and payments network represents 6.4% of Berkshire's portfolio, worth a value of $21.5 billion as of this writing. In fact, Berkshire owns more than 20% of AmEx's outstanding shares. 

This top financial stock just reported strong results for its latest quarter. Let's dive deeper into AmEx's latest numbers, as well as why investors should consider adding the stock to their portfolios today. 

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Source Fool.com