The Warren Buffett-led Berkshire Hathaway owns numerous stocks, but American Express (NYSE: AXP) is the one that has caught my attention recently. The credit card giant pleased investors with its latest financial results, helping drive shares 24% higher this year (as of April 22).

I don't doubt that this top financial stock's bullish supporters, including Buffett, would be happy if the business saw its market cap reach $1 trillion one day. This exclusive club only has seven members today, a group that's mostly dominated by tech firms.

Can American Express hit the 13-figure valuation by 2050?

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Source Fool.com