Bill Gates’ Hidden AI Bet Isn’t Microsoft — It’s a 183% Surge in Caterpillar
Everyone knows Bill Gates made his fortune on Microsoft. But a closer look at the Gates Foundation Trust’s latest 13F filing reveals a surprising heavyweight: Caterpillar Inc. (NYSE: CAT), the yellow-iron giant that most investors still lump into the “old economy” bucket.
According to the filing, the Bill & Melinda Gates Foundation Trust holds 6,353,614 shares of Caterpillar, valued at approximately $3.64 billion, with sole voting authority and no derivatives. That makes CAT one of the foundation’s largest non-Microsoft, non-Berkshire equity bets. And the returns have been staggering: shares are up 183% over the past year and 59% year-to-date, closing at $904.59 on May 5.
So what’s driving the surge? It’s not bulldozers — it’s data centers. In Q1 2026, Caterpillar’s Power Generation segment posted a 41% revenue jump to $2.82 billion, with retail sales up 48%, fueled by large reciprocating engines and turbines sold to hyperscale data center operators. That follows Q4 2025 sales of $3.24 billion, up 44%. As one energy analyst put it: “Hyperscalers can’t pull megawatts out of thin air. Someone has to sell them the generators. That someone is increasingly Cat.”
But there’s more beneath the hood. Caterpillar’s software suite — including Cat MineStar, Cat Command, and Cat Connect — uses AI and computer vision to run autonomous mining trucks, remotely operated heavy equipment, and predictive maintenance across millions of connected machines. In other words, Caterpillar both uses AI and builds the physical infrastructure that powers everyone else’s models. It’s the industrial-AI building block hiding in plain sight on Gates’s portfolio.
Q1 2026 revenue hit $17.42 billion, up 22% year-over-year, with EPS of $5.54. Construction Industries surged 38% to $7.16 billion. Management returned $5.7 billion to shareholders in the quarter alone. “Solid sales and revenue growth, combined with robust order activity, demonstrate the strength of our business,” said CEO Joe Creed. “A record backlog provides a strong foundation for continued positive momentum.”
But it’s not all smooth asphalt. Tariff-related manufacturing costs hit $710 million, and Resource Industries margins compressed 7 percentage points to 10%. Dealer inventory builds raise concerns about pull-forward demand. Shares trade at a forward P/E of 37, slightly above the analyst target of $882.94. Composite sentiment sits neutral at 45.12, down 19 points over 30 days, while r/stockmarket sentiment is “very bearish” at 18–19.
“This is classic Gates — patient, contrarian, and infrastructure-focused,” said Mark Delaney, a portfolio manager at a Boston-based wealth firm. “He’s betting that the AI build-out isn’t just about chips and code. It’s about concrete, copper, and kilowatts.”
Not everyone is convinced. “Caterpillar at 37 times forward earnings for a cyclical industrial?” scoffed Linda Tran, a retail trader and frequent Reddit commentator. “That’s not investing, that’s a cult. Gates can afford to wait 10 years. The rest of us can’t.”
“I think people are overcomplicating this,” added James Okonkwo, a supply chain analyst in Chicago. “The data center build-out is real, and Cat is the only company that can scale both the generators and the software. It’s not sexy, but it works.”
Holding billions in CAT alongside Microsoft tells you how patient capital views the AI era: own the model layer and own the diesel generator humming behind the rack. If you believe the data center capex cycle has years left, Caterpillar may be the most overlooked AI stock in Gates’s portfolio.