Tech billionaires saw their combined wealth grow by $845 billion through September, according to the Bloomberg Billionaires Index. In contrast, billionaires outside the technology sector experienced a collective loss of $62 billion during the same timeframe.
The surge in wealth is linked to the rise of artificial intelligence. Notably, the index added seven co-founders of Anthropic in June following a funding round that valued the company at $965 billion. Meanwhile, founders of Chinese AI labs like DeepSeek and MiniMax are increasingly entering the rankings.
Market concentration has reached levels not seen since the mid-1960s, with the 10 largest S&P 500 companies accounting for nearly 40% of the index by mid-2025. Historical data suggests that such high concentration does not guarantee future performance for investors.
Investment risks remain a point of discussion. Lone Pine Capital saw its flagship hedge fund lose nearly all of a 44% gain recorded through June due to reversed AI bets. Additionally, Ray Dalio of Bridgewater Associates recently warned of a potential AI bubble, citing rising interest rates and debt.
