AI boom adds $500 billion to wealth of US tech barons in 2025

A stock market boom in AI companies added over $500 billion to the wealth of America's tech barons in 2025, Bloomberg reported. The combined net worth of the top 10 US tech founders and executives rose to nearly $2.5 trillion by Christmas Eve, from $1.9 trillion at 2025's start. Elon Musk's net worth jumped nearly 50% year-on-year to $645 billion.