These disruptive companies could deliver monster gains for long-term investors.

If you're looking for high- growth stocks to fuel your portfolio, you've come to the right place. Even as the major market indices race to new highs this year, there continue to be great opportunities to find long-term winners among relatively small companies that are disrupting or supercharging the growth of a new industry.

Let's look at two innovative companies that could deliver explosive gains for investors.

1. SoundHound AI

As the adoption of artificial intelligence (AI) grows, one market expected to see explosive demand in the coming years is voice AI solutions. SoundHound AI ( SOUN -0.37% ) is a small company with a market cap of $5 billion, but it has been investing in speech recogniti

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