Shares of SoundHound AI (NASDAQ: SOUN) rose 347% in February, according to data from S&P Global Market Intelligence. You didn't misread that -- the voice-control and audio analytics expert more than quadrupled its stock price last month.

The massive gain was based on an unexpected investment. Artificial intelligence (AI) hardware giant Nvidia (NASDAQ: NVDA) disclosed a modest stake in SoundHound AI, lighting a red-hot fire under the stock.

Let's start with Nvidia's investment.

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Source Fool.com