Billionaire investor Bill Ackman has placed a massive wager on artificial intelligence, with 48% of Pershing Square Capital Management's $14.6 billion portfolio concentrated in just three AI stocks. Ackman's largest positions include Alphabet at 19%, Amazon at 8.7%, and Uber Technologies at 20%, reflecting his belief in AI's transformative potential across multiple sectors.

Alphabet's AI strategy centers on integrating generative AI and large language models into Google Cloud, which delivered 47% year-over-year sales growth in the December quarter. The company's dominant advertising business, powered by Google and YouTube, provides the cash flow to fund aggressive AI investments. Alphabet ended 2025 with $126.8 billion in cash and cash equivalents, giving it substantial firepower for continued AI development.

Amazon's AI focus is primarily through AWS, the world's leading cloud infrastructure platform with nearly a third of global market share. AWS's AI capabilities have helped reaccelerate growth to 24% constant-currency sales growth in Q4. Meanwhile, Uber's AI integration powers its ride-sharing platform's route optimization and dynamic pricing, positioning it at the forefront of a market expected to grow from $88 billion to $918 billion by 2033.