The Oracle of Omaha's "hidden" $602 million portfolio has been a decisive seller of three brand-name companies on the cutting edge of the artificial intelligence (AI) revolution.

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These three small-cap AI stocks have a shot at generating millionaire-making gains over the next decade: SoundHound AI (NASDAQ: SOUN), Serve Robotics (NASDAQ: SERV), and Evolv Technologies (NASDAQ: EVLV). Image source: Getty Images.

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As a result, Broadcom and Nvidia are positioned to benefit for years as the AI industry expands from 2023's global market size of $136 billion to an estimated $827 billion by 2030. This is one reason owning shares in both is a great way to invest in the secular trend of AI.