Thomas Siebel

Thomas Siebel

Thomas Siebel (#1084)

Global Rank #1084
Country Rank #406
Country United States

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

Snapshot

Quick Facts

Global Rank #1,084
Country Rank #406
Net Worth $4.0B
Previous Worth $4.0B
Worth Change +$0.0B
Country United States
Industry Business software
Age 73 Years
Gender M
Worth As Of May 4, 2026
Residence Woodside, California
Citizenship United States
World Billionaires List United States Billionaires Business software

Profile Data

Personal Stats

Age 73
Source Of Wealth Business software, Self Made
Self Made Score 8
Philanthropy Score 4
Residence Woodside, California
Citizenship United States
Marital Status Married
Children 4
Education Bachelor of Arts/Science, University of Illinois, Urbana-Champaign; Master of Science, University of Illinois, Urbana-Champaign; Master of Business Administration, University of Illinois, Urbana-Champaign
Net Worth Change +$0.0B +0.0% from previous worth
Previous Net Worth $4.0B
Current Net Worth $4.0B

Worth as of May 4, 2026

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

Forbes List Highlights

A snapshot of the list placements and rankings connected to Thomas Siebel.

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

Insights

Did You Know?

Siebel was attacked by an elephant on a 2009 safari trip in Serengeti; he barely escaped death and underwent 19 reconstructive surgeries.

Siebel owns a 90,000-acre ranch in Wolf Creek, Montana where he raises over 1,000 cattle and produces 500,000 pounds of beef annually.

Wealth Growth

Net Worth Growth Over Time

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

Worth Trend Net Worth Growth
Period Change Worth Movement
Current Net Worth: $4.0B (May 4, 2026)

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