Been diving into Q2 2025 portfolio moves from some of the world's wealthiest investors, and there's actually a pretty interesting pattern emerging about what stocks are billionaires buying these days.

First thing that jumped out at me was Amazon. Not just one or two big names either - Chase Coleman added 4.1 million shares through Tiger Global, boosting his stake by 62%. David Tepper moved on it too with his Appaloosa fund. But the real headline was Bill Ackman dropping roughly $1.28 billion into a fresh Amazon position at Pershing Square. The timing tells you everything - Amazon's stock got hammered in early Q2, and these guys basically said 'this is the price we've been waiting for.' Ackman's team confirmed they'd had AWS on their radar for ages, just needed the valuation to make sense. Makes sense when you think about where cloud services and AI are heading.

Alphabet was another one getting serious attention. Ackman loaded up on class A shares, Coleman increased his class A position, and Englander went after the class C shares - up 32% for his Millennium Management fund. Again, the Q2 selloff created the opening. Tepper actually went the opposite direction though, cutting his Google parent stake by 25%. Interesting divergence there, but most of the billionaire money was flowing in during the dip.

Now here's where things got wild - what stocks are billionaires buying in the healthcare space? UnitedHealth Group absolutely exploded on the billionaire buying lists. Tepper cranked up his Appaloosa position by 1,300% and it's now his second-biggest holding. But the real shock was Warren Buffett actually buying - and we're talking about someone who's been a net seller for 11 straight quarters. He grabbed over 5 million UnitedHealth shares for Berkshire Hathaway. Both these guys clearly thought the stock's collapse was overdone, especially with the company facing headwinds from higher Medicare costs and DOJ scrutiny.

So what does this tell us about what stocks are billionaires buying right now? Seems like when mega-wealthy investors see quality companies trading at discounted prices, they move decisively. Amazon's cloud dominance in AI, Alphabet's position in search and cloud infrastructure, UnitedHealth's eventual recovery as premiums kick in - these aren't lottery tickets, they're structural plays. The billionaires weren't following some herd mentality either - different investors took different positions based on their own thesis. That's probably worth paying attention to if you're thinking about your own portfolio moves.