Public profile. This page is not run by Thomas Siebel and is not verified. It collects public information and reporting from The Daily Letter.
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Thomas Siebel: American businessman. Co-founder of Siebel Systems. Estimated personal net worth: $4.1 billion (Forbes 400, as of September 2025). This is a published estimate of personal wealth, not the value of a company.
Source: The Daily Letter
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