X0306 4 2021-09-23 0 0001577526 C3.ai, Inc. AI 0001241633 HOUSE PATRICIA A C/O C3.AI, INC. 1300 SEAPORT BLVD, SUITE 500 REDWOOD CITY CA 94063 1 0 0 0 Class A Common Stock 2021-09-23 4 S 0 46000 49.50 D 43730 D Class A Common Stock 217755 I See Footnote Represents weighted average sales price. The shares were sold at prices ranging from $49.50 to $49.54. 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. Due to a clerical error, the Reporting Person reported a gift of 79,438 shares on March 5, 2021, to the Patricia A. House 2020 2 Year GRAT created UTA dated September 22, 2020 (indirect ownership). Such gift did not occur. The shares owned following the reported transaction reflects the correction to shares held directly and indirectly. The shares are held by the Patricia A. House 2020 2 Year GRAT created UTA dated September 22, 2020, of which the Reporting Person is trustee. /s/ Brady Mickelsen, Attorney-in-Fact 2021-09-27