X0306 4 2021-09-13 0 0001577526 C3.ai, Inc. AI 0001031530 SIEBEL THOMAS M C/O C3.AI, INC. 1300 SEAPORT BLVD, SUITE 500 REDWOOD CITY CA 94603 1 1 1 0 Chief Executive Officer Class A Common Stock 2021-09-13 4 S 0 98698 48.71 D 5138629 I See Footnote Class A Common Stock 2021-09-13 4 S 0 197253 49.52 D 4941376 I See Footnote Class A Common Stock 2021-09-13 4 S 0 41415 50.30 D 4899961 I See Footnote Class A Common Stock 2021-09-14 4 S 0 205650 48.62 D 4694311 I See Footnote Class A Common Stock 2021-09-14 4 S 0 22450 49.42 D 4671861 I See Footnote Class A Common Stock 2021-09-15 4 S 0 29466 48.57 D 4642395 I See Footnote Class A Common Stock 2021-09-15 4 S 0 23334 49.19 D 4619061 I See Footnote Class A Common Stock 2021-09-15 4 S 0 17300 50.27 D 4061761 I See Footnote Class A Common Stock 2021-09-15 4 S 0 5300 50.95 D 4596461 I See Footnote Class A Common Stock 1756390 D 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 Transaction pursuant to a previously established Rule 10b5-1 Plan. Represents weighted average sales price. The shares were sold at prices ranging from $48.04 to $49.0375. The Reporting Person will provide upon request, to the SEC, the Issuer or 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. Represents weighted average sales price. The shares were sold at prices ranging from $49.04 to $50.035. The Reporting Person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Represents weighted average sales price. The shares were sold at prices ranging from $50.04 to $50.55. The Reporting Person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Represents weighted average sales price. The shares were sold at prices ranging from $48.185 to $49.18. The Reporting Person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Represents weighted average sales price. The shares were sold at prices ranging from $49.1875 to $49.805. The Reporting Person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Represents weighted average sales price. The shares were sold at prices ranging from $47.85 to $48.835. The Reporting Person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Represents weighted average sales price. The shares were sold at prices ranging from $48.84 to $49.82. The Reporting Person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Represents weighted average sales price. The shares were sold at prices ranging from $49.84 to $50.8375. The Reporting Person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. Represents weighted average sales price. The shares were sold at prices ranging from $50.84 to $51.15. The Reporting Person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. 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. /s/ Brady Mickelsen, Attorney-in-Fact 2021-09-15