There are a few stocks in my portfolio that I have in the "never sell" category. Now, "never" doesn't necessarily mean "never," as directional shakeups or other unforeseen events could cause me to change my stance on a business. But, as of right now, there's no way I'm selling Mastercard (NYSE: MA), Visa (NYSE: V), Costco Wholesale (NASDAQ: COST), or Adobe (NASDAQ: ADBE).

These four companies form the bedrock of my portfolio, and I'm excited to own them well into the future. In fact, a couple of them look like fantastic buys right now.

It's hard to talk about one of these companies without the other. Both operate in payment processing and have extremely similar business models. However, they differ when it comes to the geographic balance of their revenue streams. Mastercard is much more of a global company: 69% of its gross dollar volume came from outside of the U.S. By contrast,Visa is more balanced, with the U.S. accounting for just under 50% of its payment volumes.

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Source Fool.com