Thomas M. Siebel
Chief Executive Officer at C3.ai Inc. · b. 1952
Sits on 1 board. Last updated September 28, 2026
Time on boards
- Boards served
- 1
- Current seats
- 1
- Board service
- 4 years
- Director since
- 2023
4 years of board service in total across 1 board, counting each seat separately. Longest: C3.ai Inc., 3 years.
Chief executive roles
Shareholder support
Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
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C3.ai Inc. October 2, 202494.8%
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
| Date | Company | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Sep 30, 2026 | C3.ai Inc. | Gift | +239 | — | — |
| Sep 30, 2026 | C3.ai Inc. | Gift | +239 | — | — |
| Sep 30, 2026 | C3.ai Inc. | Gift | +239 | — | — |
| Sep 30, 2026 | C3.ai Inc. | Gift | +239 | — | — |
| Sep 16, 2026 | C3.ai Inc. | Option exercise | +162,247 | $3.90 | $632,763 |
| Sep 16, 2026 | C3.ai Inc. | Open-market sale | −162,247 | $10.54 | $1,710,083 |
| Sep 15, 2026 | C3.ai Inc. | Option exercise | +282,001 | $3.90 | $1,099,804 |
| Sep 15, 2026 | C3.ai Inc. | Open-market sale | −282,001 | $10.90 | $3,073,811 |
| Sep 14, 2026 | C3.ai Inc. | Open-market sale | −22,780 | $10.56 | $240,557 |
| Sep 14, 2026 | C3.ai Inc. | Gift | −21,986 | — | — |
| Sep 14, 2026 | C3.ai Inc. | Gift | +21,986 | — | — |
| Sep 11, 2026 | C3.ai Inc. | Option exercise | +44,766 | — | — |
| Sep 3, 2026 | C3.ai Inc. | Gift | −15,846 | — | — |
| Sep 3, 2026 | C3.ai Inc. | Gift | +15,846 | — | — |
| Sep 2, 2026 | C3.ai Inc. | Open-market sale | −16,890 | $10.30 | $173,967 |
Questions about Thomas M. Siebel
What boards is Thomas M. Siebel on?
Thomas M. Siebel sits on the board of C3.ai Inc.
What company is Thomas M. Siebel the CEO of?
Thomas M. Siebel is Chief Executive Officer of C3.ai Inc.
How long has Thomas M. Siebel served on boards?
Our records show at least 4 years of board service across 1 board, the earliest from 2023.
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