Investors are flocking to the artificial intelligence (AI) space to find stocks capable of producing huge gains for their portfolio. Already, many companies have seen their valuations soar. But the biggest days of growth are still ahead.

Nvidia stock was rising Friday following earnings from customer Amazon.com, which said it would continue to spend heavily on artificial-intelligence infrastructure,Nvidia shares were up 2.7% at $114.57 in early trading.

Nvidia shares are surging in premarket trading Thursday as two of its key customers—Microsoft and Meta Platforms—posted strong results and committed to continuing their heavy AI spending.