Rank 935 of 3,368
Thomas Siebel net worth
Thomas Siebel's net worth is estimated at $4.6 billion as of 15 Oct 2026, according to Forbes Real-Time Billionaires. The fortune comes mainly from Siebel Systems, C3.ai.
- Country
- 🇺🇸 United States
- Industry
- Technology
- Age
- 73
- Self-made
- Yes
- City
- Woodside
- Source of wealth
- Siebel Systems, C3.ai
+$467M
+11.4%
vs Jan 2025
Thomas's net worth over time
2 dated estimates since 2025
| As of | Net worth | Source |
|---|---|---|
| 15 Oct 2026 | $4.6B | Forbes Real-Time Billionaires |
| 2025 | $4.1B | Forbes |
About Thomas Siebel
Thomas Siebel (United States) has 2 dated net worth estimates in the public record, the latest $4.6 billion as of 15 Oct 2026 from Forbes Real-Time Billionaires. The fortune is tied to Siebel Systems, C3.ai, which we classify under technology. Thomas was born in 1952. The earliest estimate we hold, $4.1 billion, is dated 2025. That places Thomas at number 935 in the current ranking.
Companies linked to Thomas in the public record: Siebel Systems, C3.ai.
Sources
- Forbesforbes.com/forbes-400/
- Forbes Real-Time Billionairesforbes.com/profile/thomas-siebel/
- Identity factsOpen public knowledge base record
The description is written by BillionaireList editors from public facts. How estimates are made: methodology.
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