In 2023, John was ranked 345th on the Forbes 400. John previously worked at Enron, earning $750 million for the company in 2001, the year it went bankrupt, according to Forbes. Philanthropists Laura and John Arnold, who fell off the Forbes' 400 list in 2025. In 2008, John and Laura launched the Laura and John Arnold Foundation, which has since evolved into Arnold Ventures. John Arnold, Co-Founder and Co-Chair, Arnold Ventures, speaks on stage during The Texas Tribune Festival at Omni Hotel on September 06, 2024 in Austin, Texas.

Source: Forbes December 27, 2025 03:23 UTC