Artificial intelligence (AI) is hot right now. Some might argue that it's too hot. 

The valuations of many of the biggest AI leaders have skyrocketed so far this year, but there's still a lot of room for them to run over the next few years. My prediction is that six AI stocks will be worth a combined $20 trillion or more by 2030.

It's no coincidence that 6 out of the 7 biggest stocks based on market cap that trade on U.S. exchanges have a major focus on AI. These big six of AI are:

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Source Fool.com