Tech billionaires added a record $845 billion to their combined fortunes through September 2025, according to the Bloomberg Billionaires Index. Over the same stretch, billionaires outside the technology sector lost $62 billion in aggregate. The split shows how completely the AI-driven stock rally has reshaped the top of the wealth rankings — and how little the rest of the ultra-rich have to show for it.
Technology now supplies a fifth of the world's richest
About 100 of the world's 500 richest people trace their fortunes to technology, Bloomberg News wealth reporter Dylan Sloan wrote. That's roughly one in five. The concentration wasn't always this lopsided; the recent surge in AI infrastructure spending, chip demand and private funding rounds has pushed founders and early employees of AI companies into the index at a pace that's hard to ignore.
The newest entrants aren't all from Silicon Valley. More new billionaires now come from China, including founders of AI labs such as DeepSeek and MiniMax, according to Sloan. Their arrival signals that the AI wealth boom has spread well beyond the U.S. venture ecosystem.
From drawer slides to server racks
One of the more unusual additions is Taiwan's King Slide. The company started out making drawer slides — the metal rails inside cabinets and furniture — and now supplies slides for data center server racks. Its founder entered the Bloomberg Billionaires Index with a net worth of $9.5 billion. It's a reminder that the AI buildout pays not just software developers but hardware suppliers that most people have never heard of.
Private AI labs have minted billionaires too. Bloomberg added all seven Anthropic co-founders to its billionaire index in June 2025 after a funding round valued the company at $965 billion. That valuation, if it holds, would put Anthropic among the most valuable private companies in history.
An all-American top ten, for the first time since 2012
Americans have held all 10 top spots on the Bloomberg Billionaires Index since September 10, 2025 — a first since Bloomberg began tracking the ranking in 2012. The U.S. dominance at the very top reflects both the scale of American tech fortunes and the relative weakness of wealthy heirs and industrialists elsewhere.
That geographic concentration mirrors what's happening inside equity markets. S&P Global research found that the 10 largest S&P 500 companies held almost 40% of the index by mid-2025, a concentration level last seen in the mid-1960s. The same report noted that the top 10 companies in 1965, which then made up almost half the index, fared poorly over the next 60 years — even as the S&P 500 gained about 7.4% annually excluding dividends. The parallel isn't a prediction, but it's the kind of comparison that makes allocators nervous.
Cracks in the AI trade
Not everyone riding the AI wave has stayed on it. Lone Pine Capital's flagship hedge fund erased almost all of a 44% gain through June 2025 after AI-related bets reversed. The fund's stumble shows how quickly momentum can turn when a single theme drives returns.
Bridgewater Associates founder Ray Dalio issued an AI bubble warning in the week before the Bloomberg article, tying the risk to AI debt and rising interest rates. Dalio's warning adds to a growing list of cautionary notes from prominent investors, though the billionaire index itself shows no sign of a broad retreat yet.
What to watch next
The next Bloomberg Billionaires Index update will show whether the tech gains through September hold or whether the AI trade's recent wobbles start showing up in private fortunes. The concentration question — both in the index and in the S&P 500 — won't resolve itself either. For now, the wealth gap between tech and everything else is the widest it's been in more than a decade.
