Only five U.S. companies have market caps over $1 trillion right now -- Apple, Microsoft, Alphabet, Amazon, and Nvidia, in that order. There are others coming up the pipeline, though, as the markets reach or get close to new records.

It would be very hard to knock one of these five mammoth companies off their perches. Still, there are up-and-coming stocks that are growing a lot faster, and they could enter the top five at some point. If you have a long time horizon and a patient approach to investing, there are reasons that (NASDAQ: MELI) could become a trillion-dollar stock. It's also a top growth stock to own regardless of your time horizon.

MercadoLibre is an e-commerce platform in Latin America, but it's a lot more than that. It has built a huge fintech business, which it started by figuring out a way for underbanked customers to be able to shop on its digital platform. That resulted in a digital payment platform that has now expanded into a full financial services app and credit business.

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Source Fool.com