Billionaire Profile
Thomas Siebel
Global Rank
#1080

Image: C3 Energy | CC BY-SA 1.0 | via Wikimedia Commons

Thomas Siebel

CEO, Business software
UNITED STATES
Real-Time Net Worth
$3.958B
Estimated based on Business software stock value as of March 6, 2026
+0.05% (24h)
Age
73
Source
Business software
Industry
Technology
Citizenship
UNITED STATES

Biography

Thomas Siebel is a prominent American businessman, technologist, and author, best known for founding Siebel Systems, a leading customer relationship management (CRM) software company, which was later acquired by Oracle. Born in Chicago, Illinois, in 1952, Siebel is a graduate of the University of Illinois at Urbana-Champaign, holding degrees in history, computer science, and business administration. His career includes executive positions at Oracle Corporation and Gain Technology, before establishing Siebel Systems in 1993. More recently, he founded C3.ai, an enterprise AI software company. With an estimated net worth of $4.0 billion, Siebel continues to influence the technology landscape, demonstrating a consistent drive for innovation and a commitment to philanthropy through the Siebel Foundation.

Fact Checked
Verified by Editorial Team
Live Data
Updated 3/6/2026

Wealth Over Time

In-Depth Profile

Early Life

Thomas M. Siebel was born on November 20, 1952, in Chicago, Illinois. He was one of seven children. He attended the University of Illinois at Urbana-Champaign, where he earned a Bachelor of Arts in history, a Master of Business Administration, and a Master of Science in computer science.

Rise to Success

Siebel began his career at Oracle Corporation, where he held several management positions from 1984 to 1990. In 1993, he founded Siebel Systems, a software company specializing in customer relationship management (CRM) applications. Under his leadership, Siebel Systems became a dominant force in the CRM market. By 2000, the company had over 8,000 employees and annual revenue exceeding $2 billion. Siebel Systems was acquired by Oracle in January 2006 for $5.8 billion. In 2009, he founded C3.ai, an enterprise AI software company.

Key Business Strategies

Siebel's success can be attributed to his intense focus on sales-based performance and customer service. He applied CRM principles to his own company and emphasized employee education. Siebel is known for his "self-learning corporate culture".

Philanthropy

Siebel is involved in philanthropy through the Thomas and Stacey Siebel Foundation, supporting education, health, drug prevention, and other causes. He has donated heavily to the University of Illinois at Urbana-Champaign, establishing the Siebel Center for Computer Science and other endowments. The Siebel Foundation's flagship program is the Siebel Scholars initiative. In 2023, the foundation distributed $6.2 million across 28 grants.

Career Milestones

1984

Executive at Oracle Corporation

Held various management positions.

1990

CEO of Gain Technology

Served as Chief Executive Officer.

1993

Founder, Chairman, and CEO of Siebel Systems

Founded Siebel Systems, a CRM software company.

2006

Siebel Systems acquired by Oracle

Siebel Systems was sold for $5.8 billion.

2009

Founder, Chairman, and CEO of C3.ai

Founded C3.ai, an enterprise AI software company.

Philanthropy & Social Impact

Education

Siebel Scholars Program

$35K

Awards to outstanding graduate students.

Various

Siebel Foundation Grants

$6.2M

Distributed across 28 grants in 2023.

Education

Siebel Center for Computer Science

$32M

Donation to the University of Illinois at Urbana-Champaign for construction.

Health

Meth Project

N/A

Initiative to prevent methamphetamine abuse.

Business Philosophy & Leadership

Notable Quotes

"History will look back unkindly at social networks, They need to be regulated before they destroy the roots of freedom and democracy."

Controversies & Challenges

2022

Controversial Political Donations

Donated $90,000 to the Canada convoy protest. Donated $500,000 to Donald Trump's re-election campaign.