These innovative businesses could deliver explosive returns.

Spending on artificial intelligence (AI) is expected to reach as much as $4 trillion by 2030. This forecast has put a lot of attention on big tech giants that are spending big on data center infrastructure. But if you dig deeper, you can find small- to mid-cap stocks that could also benefit and deliver explosive returns. Here are two smaller AI stocks that are flying under Wall Street's radar.

1. SoundHound AI

SoundHound AI ( SOUN 6.46% ) emerged as a leader in conversational AI, allowing people to interact with devices as easily as talking to another person. The stock soared 400% over the last three years, yet this company is only followed by five Wall Street analysts.

Low coverage on Wall Street is typical of small-

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