X0609 4 2026-09-15 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 1 Class A Common Stock 2026-09-15 4 M 0 282001 3.90 A 1004363 D Class A Common Stock 2026-09-15 4 S 0 282001 10.90 D 722362 D Class A Common Stock 2026-09-16 4 M 0 162247 3.90 A 884609 D Class A Common Stock 2026-09-16 4 S 0 162247 10.54 D 722362 D Class A Common Stock 7105019 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 Stock Option (Right to Buy) 3.90 2026-09-15 4 M 0 282001 0 D 2028-11-27 Class A Common Stock 282001 2131195 D Stock Option (Right to Buy) 3.90 2026-09-16 4 M 0 162247 0 D 2028-11-27 Class A Common Stock 162247 1968948 D The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024. The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $10.76 to $11.04, 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 price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $10.35 to $10.68, 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. Fully vested. /s/ Tom MacMitchell, Attorney-in-Fact 2026-09-17