Tracking changes in Warren Buffett's portfolio might just be one of the most enjoyable activities in investing. The celebrated investor has made billions by sticking to some pretty straightforward strategies.

One of the industries that Buffett tends to prefer is financial services. Three of his longest-tenured holdings are payment processors American Express, , and Mastercard.

While it's easy to understand why these blue chip brands have earned coveted positions in Buffett's exclusive portfolio, keep in mind that the payments sector has global appeal. For this reason, despite the broad reach of the companies above, there is always a possibility for disruption.

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Source Fool.com