Latest Update: Thomas Siebel & Career Highlights Net Worth 2026: How Rich Is the Star Today? Salary & Wealth

Many fans are curious about Thomas Siebel's financial success in April 2026. In this article, we dive deep into the assets and career highlights.

What is Thomas Siebel's Net Worth?

Between 1984 and 1990, Siebel held various management positions at the computer technology company Oracle Corporation. After that, he served as the CEO of the software company Gain Technology, which merged with Sybase in late 1992.

Thomas Siebel worked for Oracle from 1984 to 1990. In 1993 he co-founded Siebel Systems, a software company that designed, developed, marketed, and supported customer relationship management (CRM) applications. Oracle bought Siebel Systems in January 2006 for $5.8 billion. For many years Thomas famously had a bitter rivalry with Oracle founderLarry Ellison.

Thomas' second cousin is an investment banker named Kenneth Siebel. Kenneth's daughter Jennifer Siebel is married toGavin Newsom, the Governor of California.

Thomas Siebel is an American businessman who has a net worth of $4 billion. Thomas Siebel earned his fortune as the founder of the software company Siebel Systems and the artificial intelligence company C3.ai. He is also the chairman of First Virtual Group, a diversified holding company with interests in such areas as agribusiness and commercial real estate. In other endeavors, Siebel founded his own foundation to support philanthropic work.

Thomas Siebel was born on November 20, 1952 in Chicago, Illinois as one of seven children of Ruth and Arthur. For his higher education, he went to the University of Illinois Urbana-Champaign, from which he earned his BA in history, and later his MBA. Siebel also obtained an MS in computer science from U of I.

In 1993, Siebel founded Siebel Systems, a company that originally made sales force automation software. Eventually, it moved into the larger CRM market, and by the late 1990s was the dominant CRM vendor and the fastest-growing technology company in the United States. Siebel Systems grew to encompass over 8,000 employees in 32 countries before merging with Oracle Corporation in early 2006 in a deal that valued Siebel Systems at $5.8 billion.

Ultimately, Thomas Siebel's financial journey is a testament to their success.

Disclaimer: All net worth figures are estimates based on public data.