X0306 4 2021-06-14 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 0001834425 Siebel Living Trust u/a/d 7/27/93, as amended C/O C3.AI, INC. 1300 SEAPORT BLVD, SUITE 500 REDWOOD CITY CA 94063 0 0 1 0 Class A Common Stock 2021-06-14 4 S 0 156920 59.92 D 7082552 I See Footnote Class A Common Stock 2021-06-14 4 S 0 80394 60.99 D 7002158 I See Footnote Class A Common Stock 2021-06-14 4 S 0 114095 61.91 D 6888063 I See Footnote Class A Common Stock 2021-06-15 4 S 0 193136 57.28 D 6694927 I See Footnote Class A Common Stock 2021-06-15 4 S 0 87739 58.29 D 6607188 I See Footnote Class A Common Stock 2021-06-15 4 S 0 42075 59.43 D 6565113 I See Footnote Class A Common Stock 2021-06-15 4 S 0 6550 60.03 D 6558563 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 $59.49 to $60.45. 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 $60.53 to $61.525. 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 $61.53 to $62.50. 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 $56.92 to $57.91. 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 $57.92 to $58.91. 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 $58.92 to $59.91. 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 $59.92 to $60.20. 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 2021-06-16 /s/ Brady Mickelsen, Attorney-in-Fact 2021-06-16