X0609 4 2026-06-01 0 0001577526 C3.ai, Inc. AI 0001031530 SIEBEL THOMAS M false C/O C3.AI, INC. 1400 SEAPORT BLVD, SUITE 500 REDWOOD CITY CA 94603 1 1 1 0 CEO and Chairman of the Board 0 Class A Common Stock 2026-06-01 4 M 0 32736 A 755098 D Class A Common Stock 2026-06-01 4 M 0 6166667 11.16 A 6921765 D Class A Common Stock 2026-06-02 4 S 0 17350 11.32 D 6904415 D Class A Common Stock 2026-06-03 4 G 0 6182053 0 D 722362 D Class A Common Stock 2026-06-03 4 G 0 6182053 0 A 6902156 I See Footnote Class A Common Stock 9216 I See Footnote Class A Common Stock 170294 I See Footnote Class A Common Stock 72695 I See Footnote Class A Common Stock 1237115 I See Footnote Restricted Stock Units 2026-06-01 4 M 0 32736 0 D Class A Common Stock 32736 65474 D Stock Option (Right to Buy) 11.16 2026-06-01 4 M 0 6166667 0 D 2030-08-26 Class A Common Stock 6166667 0 D Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement. Pursuant to the Issuer's policies and practice, these shares of Class A Common Stock were automatically withheld and sold by the Issuer to satisfy the Reporting Person's tax withholding obligations related to the vesting of RSUs reported herein. The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $11.22 to $11.435, 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. The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee. The shares are held by First Virtual Holdings, LLC, of which the Reporting Person is Chairman. The shares are held by Siebel Asset Management, L.P., of which the Reporting Person is the general partner. The shares are held by Siebel Asset Management III, L.P., of which the Reporting Person is the general partner. The shares are held by The Siebel 2011 Irrevocable Children's Trust, of which the Reporting Person is co-trustee. 1/12th of the RSUs vest on each quarterly anniversary from December 1, 2023, so long as the Reporting Person continues to provide services through such vesting date. Due to rounding in connection with the reverse stock split, the total shares include 1 additional share that was not originally reported on the Reporting Person's Form 3. Fully vested. /s/ Sasha Pesic, Attorney-in-Fact 2026-06-03