According to the Bloomberg Billionaires Index, a daily updated ranking of the 500 richest people in the world compiled by the American financial agency, the combined wealth of the 100 billionaires in the technology sector reached 4,600 billion dollars (4,086 billion euros) as of September 30. This represents an increase of 845 billion dollars (750 billion euros) compared to December 2025. In contrast, billionaires who built their fortunes in other sectors have lost a total of 62 billion dollars (55 billion euros) since January. This surge in wealth is driven by the rise of artificial intelligence (AI) and the strengthening of technology values, particularly in the United States. For the first time since the index was created in 2012, "the ten richest people in the world are all American," notes Bloomberg. At the top of the list, Elon Musk, "the richest person in the world," saw his fortune increase by 310 billion dollars (277 billion euros) since the beginning of the year, approaching 1,000 billion dollars (892 billion euros). Michael Dell, CEO of Dell Technologies, saw his fortune jump by 81 percent, reaching 254 billion dollars (227 billion euros). Mark Zuckerberg's fortune increased by 23 billion dollars (20.5 billion euros) due to a 27 percent rise in the stock price of Meta Platforms since the launch, at the beginning of September, of Muse, his new personal assistant based on AI. As of September 30, it was estimated at just over 249 billion dollars (222 billion euros). The gains are "strongly concentrated at the top of the pyramid," but the rapid growth of AI also benefits the founders of startups. The seven co-founders of Anthropic, the parent company of the chatbot Claude, have all entered the ranking of the world's richest people in June. The AI boom is not only enriching the creators of language models and chip manufacturers but also those who provide "shovels and picks," that is, essential equipment and materials for building infrastructure. Lin Tsung-chi, founder of King Slide, a Taiwanese company specializing in the manufacture of metal rails allowing the support and movement of computer servers, is now at the head of a fortune estimated at 9.5 billion dollars (8.5 billion euros). However, the unprecedented debt of technology companies is raising more and more doubts, notes Bloomberg. Fortunes that owe everything to the AI fever are likely to collapse in an instant. In 2025, Larry Ellison, founder of the cloud giant and supercomputer specialist Oracle, was the richest person in the world for only two months before his fortune plummeted by 196 billion dollars (175 billion euros). The cause: the loss of investor confidence "reluctant to fund the massive loans necessary for the development of his AI infrastructure." Elon Musk justifies Plato's concerns about the infinite greed of the ultra-rich. In the United States, the AI boom is deepening inequalities. In China, the new billionaires have nothing to envy their predecessors. OpenAI postpones its initial public offering, and technology values are falling.