Just caught something interesting in the latest 13F filings. Billionaire Bill Ackman's been making some seriously concentrated bets on artificial intelligence, and it's worth paying attention to what he's doing.

So here's the thing - about 48% of his entire Pershing Square portfolio is tied to just three AI stocks. That's a pretty bold move, and it tells you something about where he thinks the real opportunities are right now. His fund was sitting on roughly $14.6 billion in assets by the end of Q3, and nearly half of that is concentrated in these three plays.

Let's break it down. First up is Alphabet, which makes up about 19% of his invested capital. This one's straightforward - Google Cloud is growing like crazy with generative AI baked into the infrastructure. We're talking 47% year-over-year growth in their cloud segment. But here's what people sometimes miss: Alphabet's got this massive cash generation machine from search and YouTube advertising that's funding all their AI experiments. They ended 2025 with over $126 billion in cash and are pulling in more than $40 billion quarterly from operations. That's the kind of financial flexibility that lets you swing big on emerging trends.

Then there's Amazon at 8.7% of the portfolio. Most people think about Amazon as an e-commerce company, but AWS is where the real money is. It's the number one cloud infrastructure platform globally, and they've been aggressively integrating AI solutions. AWS hit 24% growth in Q4 with constant-currency adjustments. On top of that, their advertising business and Prime content strategy are printing money. Amazon's also sitting on roughly $123 billion in cash, so they've got room to invest aggressively.

But here's where it gets really interesting - Ackman's biggest bet is actually on Uber Technologies, representing about 20% of his holdings. A lot of people don't realize this, but ride-sharing is an AI-dependent business. Dynamic pricing, route optimization, driver-rider matching - it's all AI. And the addressable market is projected to absolutely explode. We're talking growth from under $88 billion in 2025 to potentially $918 billion by 2033. That's roughly a 10X expansion. Uber's sitting at around 76% of the U.S. market share, so they're positioned right at the center of this growth story. Plus, they've got Uber Eats and their freight logistics business, which are also leveraging AI as a core tool.

What's notable about Ackman's 13F filing is the conviction it shows. This isn't diversified dabbling - it's a clear thesis that AI adoption in cloud infrastructure and mobility services represents genuine, long-term value creation. Whether you agree with his picks or not, the positioning tells you what a sophisticated activist investor sees as the next big wave.

The interesting part is watching how these plays evolve. Cloud infrastructure is becoming mission-critical for enterprises deploying AI at scale, and ride-sharing's AI transformation is just getting started. That's the narrative Ackman seems to be betting on with this portfolio concentration.