C3.ai

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-15 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: C3.ai, Inc. (AI) CIK: 0001577526 --- Reporting Owner --- Name: SIEBEL THOMAS M CIK: 0001031530 Role: Director, Officer (CEO and Chairman of the Board), 10%+ Owner --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-09-15 | Code: M (Exercise of derivative) Shares: +282,001 | Price: $3.90 Total Value: $1,099,803.90 Shares Owned After: 1,004,363 | Ownership: D (Direct) Footnotes: [F1] The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024. [Transaction #2] Security: Class A Common Stock Date: 2026-09-15 | Code: S (Open market sale) Shares: -282,001 | Price: $10.90 Total Value: $3,073,810.90 Shares Owned After: 722,362 | Ownership: D (Direct) Footnotes: [F1] The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024. [F2] 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. [Transaction #3] Security: Class A Common Stock Date: 2026-09-16 | Code: M (Exercise of derivative) Shares: +162,247 | Price: $3.90 Total Value: $632,763.30 Shares Owned After: 884,609 | Ownership: D (Direct) Footnotes: [F1] The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024. [Transaction #4] Security: Class A Common Stock Date: 2026-09-16 | Code: S (Open market sale) Shares: -162,247 | Price: $10.54 Total Value: $1,710,083.38 Shares Owned After: 722,362 | Ownership: D (Direct) Footnotes: [F1] The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024. [F3] 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. --- Derivative Transactions --- [Transaction #1] Security: Stock Option (Right to Buy) Date: 2026-09-15 | Code: M (Exercise of derivative) Shares: -282,001 | Price: $0.00 Exercise Price: $3.90 Exercisable: N/A | Expires: 2028-11-27 Shares Owned After: 2,131,195 | Ownership: D (Direct) Footnotes: [F1] The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024. [F9] Fully vested. [Transaction #2] Security: Stock Option (Right to Buy) Date: 2026-09-16 | Code: M (Exercise of derivative) Shares: -162,247 | Price: $0.00 Exercise Price: $3.90 Exercisable: N/A | Expires: 2028-11-27 Shares Owned After: 1,968,948 | Ownership: D (Direct) Footnotes: [F1] The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024. [F9] Fully vested. --- Holdings --- [Holding #1] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F4] The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee. [Holding #2] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F5] The shares are held by First Virtual Holdings, LLC, of which the Reporting Person is Chairman. [Holding #3] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F6] The shares are held by Siebel Asset Management, L.P., of which the Reporting Person is the general partner. [Holding #4] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F7] The shares are held by Siebel Asset Management III, L.P., of which the Reporting Person is the general partner. [Holding #5] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F8] The shares are held by The Siebel 2011 Irrevocable Children's Trust, of which the Reporting Person is co-trustee. --- Footnotes (Complete Index) --- F1: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024. F2: 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. F3: 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. F4: The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee. F5: The shares are held by First Virtual Holdings, LLC, of which the Reporting Person is Chairman. F6: The shares are held by Siebel Asset Management, L.P., of which the Reporting Person is the general partner. F7: The shares are held by Siebel Asset Management III, L.P., of which the Reporting Person is the general partner. F8: The shares are held by The Siebel 2011 Irrevocable Children's Trust, of which the Reporting Person is co-trustee. F9: Fully vested. --- Signature --- /s/ /s/ Tom MacMitchell, Attorney-in-Fact (2026-09-17)