FilingsForm 4

C3.ai · Form 4 · Chief executive officer · Sale

From the public record

Filed May 19, 2026

Value$4.19 million

Shares481,638

Average price$8.70

FiledMay 19

The record

Issuer: C3.ai (CIK 1577526, filed as C3.ai, Inc.)
Form: 4
Accession: 0001577526-26-000049
Filed: May 19, 2026
Period of report: May 15, 2026
Reporting owner: Thomas Siebel (CIK 1031530, filed as SIEBEL THOMAS M)
Relationship: director, officer (CEO and Chairman of the Board) and owner of more than 10% of the shares
Rule 10b5-1 checkbox: Ticked
Line 1: M (exercise of a derivative security) · 369,624 Class A Common Stock at $2.04 · May 15, 2026 · acquired, directly · 1,091,986 held after · footnote F1
Line 2: S (sale) · 369,624 Class A Common Stock at $8.72 · May 15, 2026 · disposed, directly · 722,362 held after · footnotes F1 and F2
Line 3: M (exercise of a derivative security) · 112,014 Class A Common Stock at $2.04 · May 18, 2026 · acquired, directly · 834,376 held after · footnote F1
Line 4: S (sale) · 112,014 Class A Common Stock at $8.65 · May 18, 2026 · disposed, directly · 722,362 held after · footnotes F1 and F3
Derivative line 1: M (exercise of a derivative security) · 369,624 Stock Option (Right to Buy) at $0.00 · May 15, 2026 · disposed, directly · 913,094 held after · footnotes F1 and F9
Derivative line 2: M (exercise of a derivative security) · 112,014 Stock Option (Right to Buy) at $0.00 · May 18, 2026 · disposed, directly · 801,080 held after · footnotes F1 and F9
Footnote F1: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.
Footnote F2: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.62 to $8.93, inclusive. The Reporting Person will provide upon request to the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer, full information regarding the number of shares sold at each separate price.
Footnote F3: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.34 to $8.81, inclusive. The Reporting Person will provide upon request to the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer, full information regarding the number of shares sold at each separate price.
Footnote F4: The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee.
Footnote F5: The shares are held by First Virtual Holdings, LLC, of which the Reporting Person is Chairman.
Footnote F6: The shares are held by Siebel Asset Management, L.P., of which the Reporting Person is the general partner.
Footnote F7: The shares are held by Siebel Asset Management III, L.P., of which the Reporting Person is the general partner.
Footnote F8: The shares are held by The Siebel 2011 Irrevocable Children's Trust, of which the Reporting Person is co-trustee.
Footnote F9: Fully vested.