Thomas Siebel

Thomas Siebel (#1093)

Information technology is not going to be about computers. It's more fundamental than that. It's going to be about food, it's going to be about water, it's going to be about healthcare and it's going to be about energy.

$ 4 B
Business software
United States
M
73 Years

About Me

Tom Siebel built software firm Siebel Systems and sold it to Oracle in 2006 for $5.8 billion in cash and stock. A former salesman at Oracle, he left in 1990 to launch Siebel Systems. In 2009, he created C3.ai, an enterprise AI firm he took public in 2020 at a near $10 billion valuation. C3.ai started as a clean energy firm. It was briefly named C3IoT in 2016 to chase the internet of things market. He has given more than $150 million to his alma mater, U. of Illinois Urbana-Champaign, including a 2024 gift to build the Siebel School of Computing and Data Science.

Achievements

Career Highlights

A snapshot of the defining milestones, leadership decisions, and breakthroughs that shaped Thomas Siebel’s rise and global influence.

#1108 Billionaires (2026)
#362 Forbes 400 (2025)
#85 Richest In Tech (2017)

Wealth Growth

Net Worth Growth Over Time

Tracking Thomas Siebel’s net worth journey over the years, highlighting key growth phases and financial milestones.

Current Net Worth: $4.0B (May 4, 2026)