So here's something I found pretty interesting about Warren Buffett's latest moves. Everyone knows he's not the type to chase trends, right? The guy built Berkshire Hathaway into a trillion-dollar machine by sticking to fundamentals over 60 years. But when you dig into his $317 billion stock portfolio, you find out that roughly 23% is actually tied up in AI-adjacent plays. That's not accidental.

Let me break down three holdings that caught my attention. First, Amazon at 0.7% of the portfolio. Most people think of Amazon as just e-commerce, but AWS is where the real AI infrastructure game is happening. They've got a $200 billion order backlog and they're spending $125 billion this year alone building out data centers. What's wild is they're not just buying Nvidia chips anymore — they designed their own called Trainium2, which cuts costs by 40% for AI model training. Anthropic is already running 500,000 of these chips. The stock's doubled since Berkshire bought in 2019, and there's probably more runway here.

Then there's Alphabet. Google Search looked vulnerable when ChatGPT started gaining traction, but they pivoted fast with AI Overviews and integrated AI features. Search revenue actually accelerated for two quarters straight. Google Cloud is also building serious AI infrastructure with a $155 billion backlog. Their custom TPU chips are becoming legit competition to Nvidia. Alphabet stock is up 62% this year, and Berkshire just loaded up in Q3 2025. That timing looks smart.

Now, Apple is the heavyweight here at 20.6% of Berkshire's portfolio. With 2.35 billion active devices worldwide, Apple Intelligence is a massive opportunity. Every iPhone, iPad, and Mac runs Apple-designed chips optimized for AI. The latest iPhone 17 lineup is apparently driving a stronger upgrade cycle than expected. Even after Berkshire trimmed 70% of its Apple stake to lock in gains, the remaining position is still generating serious returns.

What strikes me is that these aren't flashy AI plays — they're legacy businesses using AI to unlock new value. If you're looking at best AI shares to buy, maybe the lesson here is to look for companies that already have massive user bases and distribution networks. That's where the real AI advantage compounds over time. Buffett's playbook hasn't changed, but the opportunity set definitely has.