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Photo: C3 Energy / Wikimedia Commons (CC BY-SA 1.0) (CC BY-SA 1.0 — verified at https://commons.wikimedia.org/wiki/File:Tom_Siebel_2013.png on 2026-10-14) · via The Daily Letter

Thomas Siebel

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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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