If you look at Berkshire Hathaway's gargantuan public equities portfolio, you'll quickly find that American Express (NYSE: AXP) is a top holding. The Oracle of Omaha's firm owns roughly 21% of the outstanding shares, and first started buying shares in the early '90s.

Clearly, the legendary Warren Buffett believes this top financial stock is worth a closer look. With that said, should you buy American Express for your portfolio? Let's consider some important factors.

The economy continues to be characterized by uncertainty, particularly around the possibility of a recession. Despite this, American Express keeps posting strong results.

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Source Fool.com