Thomas Siebel Net Worth 2026

The estimated net worth of Thomas Siebel is $2.2 billion USD.
Real Name Thomas Siebel
Net Worth 2026 $2.2 billion USD
Birthday (Year-Month-Day) 1952-11-20
Nationality United States
Occupation Businessman
Height m or 0 ft 0 inches
Weight kg or 0 pounds
Marital Status Married (Stacey Siebel)
Ethnicity Caucasian
Education University of Illinois at Urbana-Champaign
Kids 4
Kids Names



Thomas Siebel
Thomas M. Siebel
Siebel in 2013
Born
Thomas M. Siebel

(1952-11-20) November 20, 1952 (age 73)
Chicago, Illinois, U.S.
EducationUniversity of Illinois Urbana-Champaign (BA, MBA, MS)
OccupationsSoftware developer and businessman
Known forFounder of Siebel Systems and C3 AI
SpouseStacey Siebel
Children4
RelativesJennifer Siebel Newsom (second cousin once removed)
WebsiteThomas M. Siebel

Thomas M. Siebel (/ˈsiːbəl/; born November 20, 1952) is an American businessman, technologist and author. He founded the enterprise software company Siebel Systems and was the founder, chairman, and former CEO of C3 AI, an artificial intelligence software platform and applications company.[1] He is the chairman of First Virtual Group, a diversified holding company.[2]

Early life

Siebel was born in Chicago, one of seven children of Arthur Francis Siebel and Ruth A. (née Schmid) Siebel.[3][4][5] He graduated from the University of Illinois with a BA in history, an MBA, an MS in computer science,[6] and later received an honorary doctorate in engineering from the university.[7]

Career

Siebel was an executive at Oracle Corporation between 1984 and 1990, holding several management positions.[8][9] He was the CEO of Gain Technology, a multimedia software company that merged with Sybase in December 1992.[9] Siebel later founded Siebel Systems, where he was chairman and CEO before Oracle acquired the company in January 2006.[10][11] He is the chairman of First Virtual Group, a diversified holding company with interests in investment management, commercial real estate, agribusiness, and philanthropy.[2]

Siebel Systems

Siebel Systems was a software company primarily engaged in the design, development, marketing, and support of customer relationship management (CRM) applications.

In 1989, as an executive at Oracle, Siebel proposed turning an internal sales-force automation tool called Oasis (Oracle automated sales information system) into a commercial product, but Larry Ellison declined, claiming to see no commercial potential.[12][13]

In 1993, Siebel left Oracle and founded Siebel Systems.[14] By 1999, Siebel Systems had become one of the fastest-growing technology companies in the United States.[15] In 2000, Siebel reported that Siebel Systems had grown to over 8,000 employees in 32 countries, with more than 4,500 corporate customers and annual revenue exceeding $2 billion.[16] Siebel Systems was acquired by Oracle in 2005.[17][18]

C3 AI

Siebel founded enterprise artificial intelligence company C3 AI in 2009 and has led the company as CEO since 2011. He transitioned to the role of executive chairman in 2025 after being diagnosed with an autoimmune disease that left him visually impaired.[19][20]

Management approach

In 2019, Siebel initiated a program at C3 AI that covers the cost for employees to complete the University of Illinois’s online Master of Computer Science (MCS) degree through Coursera. Employees who complete the MCS receive a 15% salary increase, a $25,000 cash bonus, and additional stock options.[21][22]

Honors and awards

Siebel has held advisory and board positions at institutions including Stanford, the University of Illinois, and the University of California, Berkeley.[23][24] He was a Trustee at Princeton University from 2008 to 2011.[25] He also chairs the American Agora Foundation and is a director at the Hoover Institution at Stanford.[26][27] Siebel is the founder of the Montana Meth Project and the Siebel Scholars Foundation.[28][29] His philanthropic contributions have been recognized by publications such as Barron's, which ranked him among the world's top 25 philanthropists in 2009 and 2010,[30][31] and BusinessWeek, which included him in its list of The 50 Most Generous Philanthropists in 2007 and 2008.[32]

Philanthropy

In 2001, Siebel donated $32 million to the Department of Computer Science at the University of Illinois at Urbana-Champaign, his alma mater, for the construction of the Siebel Center for Computer Science, which opened in the spring 2004.[33] In 2006, he donated $4 million to the university to establish two endowed professorships: the Thomas M. Siebel Chair in the History of Science and the Thomas M. Siebel Chair in Computer Science.[34] In 2007, Siebel pledged an additional $100 million gift to the university.[35]

In 2015, the Siebel Foundation launched the Siebel Energy Institute to support research on the data management of energy infrastructure monitoring.[36] In 2016, Siebel donated $25 million to fund the construction of the Siebel Center for Design at the University of Illinois, a 60,000-square-foot multidisciplinary facility designed by the architectural firm Bohlin Cywinski Jackson, which was completed in 2020.[37]

Political involvement

In February 2022, Siebel donated $90,000 to the Canada convoy protest in Ottawa, which opposed COVID-19 vaccine mandates and restrictions.[38][39][40]

In 2024, Siebel donated $500,000 to Donald Trump’s re-election campaign.[41] Siebel also organized a fundraiser for the politician in September of the same year.[42]

In 2025, Siebel donated $1,000,000 toward funding efforts opposing California's Proposition 50,[43] making him the third largest single donor in opposition to the bill.[44]

Personal life

Siebel lives in Woodside, California and is married to Stacey Siebel,[3] with whom he has four children. Siebel is the second cousin once removed of Jennifer Siebel Newsom, the First Partner of California and wife of Governor Gavin Newsom.[45]

In 2022, Siebel had the highest personal CO2 emissions from private jet use of any American.[46]

Health

Siebel was diagnosed with the autoimmune disease giant cell arteritis in early 2025, which caused significant visual impairment.[19][20]

Elephant incident

In August 2009, while in Tanzania, Siebel and a guide were observing a group of elephants from 200 yards away when an elephant charged the guide and then turned on Siebel, breaking several ribs, goring him in the left leg, and crushing the right.[47][48] After radioing for help, it took three hours for him to receive medical treatment.[47] He was flown to the Aga Khan University Hospital in Nairobi, where his wounds were cleaned and his leg was stabilized. He was then flown back to the United States on a 20-hour flight, during which he received 10 hours of morphine and 15 hours of fluids. Having lost half his fluids, he was admitted to the intensive care unit.[49] He was moved to Stanford Hospital where, over the next six months, doctors performed 11 surgeries, fixed his ribs and shoulder, and saved his left leg.[48]

In September 2010, Siebel underwent 16 surgeries and an Ilizarov apparatus external fixator procedure to mend, lengthen, and reshape the tibia of his right leg.[49] After 19 reconstructive surgeries over two and a half years, Siebel fully recovered.[50] In 2013, National Geographic included Siebel's account in its TV series Dead or Alive: Trampled on Safari.[51]

Books and articles

  • Digital Transformation (2019)[52] ISBN 1948122480
  • "Digital Transformation: The Post-Industrial Utility" (Aspenia Magazine, June 2018)[53]
  • "Why digital transformation is now on the CEO’s shoulders" (McKinsey Quarterly, December 2017)[54]
  • "The Internet of Energy" (Electric Perspectives, March/April 2015)[55]
  • "Big Data and the Smart Grid: Is Hadoop the Answer?" (Stanford Energy Journal, October 21, 2014)[56]
  • Taking Care of eBusiness (2001) ISBN 0-385-50227-3
  • Cyber Rules (with Pat House) (1999)[57] ISBN 0385494122
  • Virtual Selling (with Michael Malone) (1996)[58] ISBN 0684822873

References

  1. ^ Nusca, Andrew (February 25, 2016). "Tom Siebel, Tech Pioneer, Bets Big on the Internet of Things". Fortune. Retrieved May 16, 2016.
  2. ^ a b Develpixel. "First Virtual Group". Retrieved 17 May 2016.
  3. ^ a b Chicago Tribune: "Obituary - Siebel, Ruth A." January 27, 2006
  4. ^ Wilmette Public Library newspapers Wilmette Life (Wilmette, Illinois), 17 Nov 1955, p. 1 retrieved April 2, 2013
  5. ^ "Full text of "Brown alumni monthly"". May 1987. Retrieved 17 May 2016.
  6. ^ Businessweek: "TOM SIEBEL--CEO, Siebel Systems Inc." By Gabrielle Saveri August 14, 1997
  7. ^ University of Illinois News Release: "Four Chosen to Receive Honorary Degrees at U. of I. May Commencement" By Sharita Forrest February 16, 2006
  8. ^ Top Tech Execs: Tom Siebel, Forbes
  9. ^ a b Tom Siebel, Fast Company
  10. ^ Siebel, Tom; Fryer, Bronwyn (1 March 2001). "High-Tech the Old-Fashioned Way: An Interview with Tom Siebel of Siebel Systems". Harvard Business. Harvard Business School. Retrieved February 13, 2011.[permanent dead link]
  11. ^ Wynne, Bob; Bessinger, Krista (January 31, 2006). "Oracle Completes Acquisition Of Siebel" (Press release). Oracle Corporation. Retrieved February 14, 2011.
  12. ^ "Siebel, Thomas (1952–)". Encyclopedia.com. Retrieved 9 August 2025.
  13. ^ Eid, Ashlea (15 June 1999). "A nasty little war unfolds in Silicon Valley". SFGate. Retrieved 9 August 2025.
  14. ^ Hawn, Carleen. "The Man Who Sees Around Corners". Forbes. Retrieved 13 September 2019.
  15. ^ Saracevic, Alan (16 November 1999). "Siebel Systems is nations fastest- growing tech firm". sfgate.com. Hearst. Retrieved 13 September 2019.
  16. ^ "Interview with Thomas M. Siebel". Leaders Online. Leaders Magazine. Retrieved 13 September 2019.
  17. ^ admin-ectnews (2005-09-12). "Oracle Buys Siebel in $5.8 Billion Deal". CRM Buyer. Retrieved 2025-12-01.
  18. ^ Clark, Lindsay (2 January 2025). "20 years since Oracle bought two software rivals in one". The Register. Archived from the original on 2025-09-10. Retrieved 2025-12-01.
  19. ^ a b Ford, Brody (July 24, 2025). "C3.ai CEO Tom Siebel to Seek Successor Due to Health Concerns". Bloomberg News.
  20. ^ a b Brewster, Thomas (September 5, 2025). "Billionaire Tom Siebel's C3 AI Was Supposed To Speed Up Policing. It's Not Going Well". Forbes. Retrieved 2025-09-06.
  21. ^ "Billionaire Tom Siebel Gives $50 M for Data Science at University of Illinois". Observer. May 2024. Retrieved 9 August 2025.
  22. ^ Adams, Susan (June 5, 2019). "Billionaire Tom Siebel Is Offering His Employees The Most Generous Education Benefit Ever". Forbes. Retrieved 9 August 2025.
  23. ^ Stanford University Archived 2010-07-06 at the Wayback Machine
  24. ^ "News Archive » Department of Business Administration". archive.is. 11 September 2011. Archived from the original on 11 September 2011. Retrieved 19 September 2018.
  25. ^ Princeton University, September 23, 2011
  26. ^ Hoover Institution Archived 2009-09-03 at the Wayback Machine
  27. ^ American Agora Foundation Archived 2009-06-07 at the Wayback Machine
  28. ^ "The Meth Project". Archived from the original on 7 November 2011. Retrieved 17 May 2016.
  29. ^ "A Class Apart: About the Siebel Scholars Program". Retrieved 17 May 2016.
  30. ^ The 25 Best Givers 2009, Barron's
  31. ^ The 25 Best Givers 2010 Archived 2011-07-11 at the Wayback Machine, Barron's
  32. ^ The 50 Most Generous Philanthropists Archived 2007-11-18 at archive.today, BusinessWeek
  33. ^ Thomas M. Siebel Center for Computer Science Archived 2005-04-04 at the Wayback Machine
  34. ^ Thomas M. Siebel Chair Archived 2013-02-17 at archive.today
  35. ^ U of I announces record $100 million gift from Alumnus Thomas Siebel Archived 2007-09-23 at the Wayback Machine, University of Illinois
  36. ^ Tilley, Aaron (August 5, 2015). "Tech Billionaire Tom Siebel Launches Institute To Tackle Proliferation Of Power Grid Data". Forbes. Retrieved May 15, 2016.
  37. ^ Kaler, Robin. "Alumnus Siebel Donates $25 Million For Innovative Design Center". cs.illinois.edu. University of Illinois. Retrieved 29 September 2019.
  38. ^ Woodward, Jon (February 11, 2022). "Anonymous donations to convoy as high as $215,000 concern Canadian MPs". CTV News. Retrieved February 16, 2022.
  39. ^ "Hackers Just Leaked the Names of 92,000 'Freedom Convoy' Donors". Vice News. 14 February 2022. Retrieved 14 February 2022.
  40. ^ McIntire, Mike; Keller, Michael H. (February 15, 2022). "Canadians are responsible for roughly half of the money raised online for the trucker convoy, leaked data shows". The New York Times. Retrieved February 16, 2022.
  41. ^ Bender, Michael C. (30 June 2024). "To Woo Trump, VP Contenders Show Off Their Rich Friends". The New York Times. Archived from the original on 2 July 2024. Retrieved 8 July 2024.
  42. ^ DeBenedetti, Katie (2024-09-12). "Trump Is Coming Back to the Bay Area for a Big-Ticket Fundraiser on Friday | KQED". www.kqed.org. Retrieved 2025-09-20.
  43. ^ "Proposition 50". www.voterguide.sos.gov.
  44. ^ "California Proposition 50: Use of Legislative Congressional Redistricting Map Amendment(2025)". www.ballotopedia.org.
  45. ^ Maddan, Heather. "Girlfriend, uninterrupted / Actress Jennifer Siebel is standing by her man, who happens to be Mayor Gavin Newsom, and says there's no trouble in their romance". SFGATE. Retrieved 8 July 2024.
  46. ^ "Billionaire Beware". Mother Jones. February 19, 2023. Retrieved 15 Mar 2023.
  47. ^ a b Tech mogul Tom Siebel injured by elephant, by Julia Prodis Sulek and Brandon Bailey, The Mercury News, 09/03/2009
  48. ^ a b A Golfer Never Forgets, by Jerry Tarde, Golf Digest, July 2010
  49. ^ a b Tom Siebel On Being Gored By An Elephant, as told to Steven Bertoni, Forbes magazine, 10/11/2010
  50. ^ Thomas Siebel, Forbes magazine, 6/26/14
  51. ^ Trampled on Safari, National Geographic, 6/26/14
  52. ^ Siebel, Thomas M. (9 July 2019). Digital Transformation. Rodin Books. ISBN 978-1948122481.
  53. ^ "Charging ahead: the energy transition". aspeninstitute.it. Aspen Institute Italia. Retrieved 29 September 2019.
  54. ^ Siebel, Thomas. "Why digital transformation is now on the CEO's shoulders". mckinsey.com. McKinsey & Co. Retrieved 29 September 2019.
  55. ^ Siebel, Thomas. "The Internet of Energy". libraries.swbts.edu. Electric Perspectives. Retrieved 29 September 2019.
  56. ^ Siebel, Thomas. "Big Data and the Smart Grid: Is Hadoop the Answer? (archive copy)". sej.stanford.edu. Stanford University. Archived from the original on 2019-09-29. Retrieved 29 September 2019.
  57. ^ Siebel, Thomas M.; House, Pat (1999). Cyber Rules. Currency/Doubleday. ISBN 0385494122.
  58. ^ Siebel, Thomas M.; Malone, Michael Shawn; Malone, Michael (1996). Virtual Selling. Free Press. ISBN 0684822873.


Fact Sheet

  • Thomas Siebel's real name is Thomas Siebel
  • Thomas Siebel is United States
  • Thomas Siebel is a(n) Businessman
  • Thomas Siebel celebrates their birthday on 11-20
  • How old is Thomas Siebel? Thomas Siebel is 74 years old
  • Thomas Siebel's relationship status is Married (Stacey Siebel)
  • Where did Thomas Siebel go to school? Thomas Siebel is a graduate of University of Illinois at Urbana-Champaign
  • Thomas Siebel has 4 kids

FAQ

Thomas Siebel 2026 net worth is $2200 million USD
Thomas Siebel has a networth of $2200 million USD
Thomas Siebel has an estimated wealth of $2200 million USD
Thomas Siebel has approximately $2200 million USD



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