Thomas M. Siebel
Thomas M. Siebel: CEO and Chairman of the Board · Director · 10% owner at C3.ai. What Thomas M. Siebel holds in an AI or semiconductor company tracked on Silicon Floor, from their SEC filings, broken down: the shares held and how, then any restricted shares, options or other rights declared.
C3.ai (AI)
Thomas M. Siebel holds 12.3M C3.ai shares (7.7% of the company), worth about $138.3M at the last price, according to the Form 4 of Sep 30, 2026.
- Shares held: 11.6M (7.2%), $130.2M — Held through companies or funds (See Footnote): 8.6M Class A, 3.0M Class B.
- Shares held: 722,362 (0.45%), $8.1M — Held in their own name: 722,362 Class A.
- Options: 2.0M (1.2%), $22.1M — The right to buy 2.0M shares at $3.90 each, until 2028. Not bought yet.
- Options: 1.1M (0.70%), $12.7M — The right to buy 1.1M shares at $17.51 each, until 2035. Not bought yet.
- Options: 886,244 (0.55%), $9.9M — The right to buy 886,244 shares at $23.55 each, until 2034. Not bought yet.
- Share units: 179,228 (0.11%), $2.0M — C3.ai promised them as pay: each unit becomes a share when it vests, if its conditions are met. No vote until then.
Declarations
- C3.ai (AI) — Form 4 of Sep 30, 2026 (CEO and Chairman of the Board): gift of 239; gift of 239; 12.3M shares after 0001031530-26-000011
- C3.ai (AI) — Form 4 of Sep 16, 2026 (CEO and Chairman of the Board): option exercise or conversion of 282,001 at $3.90; open-market sale of 282,001 at $10.90; 9.3M shares after 0001577526-26-000130
- C3.ai (AI) — Form 4 of Sep 14, 2026 (CEO and Chairman of the Board): option exercise or conversion of 44,766; open-market sale of 22,780 at $10.56; 9.3M shares after 0001577526-26-000128
- C3.ai (AI) — Form 4 of Sep 3, 2026 (CEO and Chairman of the Board): option exercise or conversion of 32,736; open-market sale of 16,890 at $10.30; 9.3M shares after 0001577526-26-000121
- C3.ai (AI) — Form 4 of Aug 11, 2026 (CEO and Chairman of the Board): option exercise or conversion of 453,314 at $3.90; open-market sale of 453,314 at $10.51; 9.3M shares after 0001577526-26-000098
- C3.ai (AI) — Form 4 of Aug 4, 2026 (CEO and Chairman of the Board): option exercise or conversion of 283,334; open-market sale of 139,500 at $9.61; 9.3M shares after 0001577526-26-000094
- C3.ai (AI) — Form 4 of Jul 15, 2026 (CEO and Chairman of the Board): option exercise or conversion of 264,100 at $2.04; open-market sale of 264,100 at $9.07; 2.2M shares after 0001577526-26-000085
- C3.ai (AI) — Form 4 of Jun 15, 2026 (CEO and Chairman of the Board): option exercise or conversion of 44,767; open-market sale of 23,570 at $10.92; 9.1M shares after 0001577526-26-000060
- C3.ai (AI) — Form 4 of Jun 3, 2026 (CEO and Chairman of the Board): option exercise or conversion of 32,736; option exercise or conversion of 6.2M at $11.16; 9.1M shares after 0001577526-26-000058
- C3.ai (AI) — Form 4 of May 18, 2026 (CEO and Chairman of the Board): option exercise or conversion of 369,624 at $2.04; open-market sale of 369,624 at $8.72; 2.9M shares after 0001577526-26-000049
- C3.ai (AI) — Form 4 of May 5, 2026 (Executive Chairman): option exercise or conversion of 53,125; open-market sale of 27,210 at $9.27; 2.9M shares after 0001577526-26-000046
- C3.ai (AI) — Form 4 of Apr 14, 2026 (Executive Chairman): option exercise or conversion of 326,189 at $2.04; open-market sale of 326,189 at $8.31; 2.9M shares after 0001577526-26-000042
- C3.ai (AI) — 13G filed May 15, 2026: 25.6M shares counted as of Mar 31, 2026, 15.3% as declared
- C3.ai (AI) — Form 4 of Mar 18, 2026 (Executive Chairman): option exercise or conversion of 282,203 at $2.04; open-market sale of 282,203 at $8.86; 2.9M shares after 0001577526-26-000032
- C3.ai (AI) — Form 4 of Mar 13, 2026 (Executive Chairman): option exercise or conversion of 44,766; open-market sale of 23,435 at $9.11; 2.9M shares after 0001577526-26-000026
Sources: SEC Schedules 13D and 13G (stakes above 5%, which count everything a person votes or can acquire within 60 days) and Forms 3, 4 and 5 (the shares a director, officer or 10% owner holds, filed within two business days of each trade). Values at the last price.