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person · Reporting owner

SIEBEL THOMAS M

Disclosed activity across 1 company

Tapewire entity
2414
SEC CIK
0001031530

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
C3.ai, Inc.AI · Entity 2413Director · CEO and Chairman of the Board · 10% ownerOctober 13, 2026October 14, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

C3.ai, Inc.

Report date October 13, 2026 · Filed October 14, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Class A Common StockSEC Table I · non-derivativeDirect722,362 Ending reported balance After 2026-10-13 transaction · row 2
2 source rows · reconciled sequence

Row 1 · 2026-10-13 · Exercise / conversion · Acquired 435,363 · Balance 1,157,725

F1: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

Row 2 · 2026-10-13 · Sale · Disposed 435,363 · Balance 722,362

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 $11.565 to $12.0123, 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.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $3.90 · Expires 2028-11-27Direct1,533,585 Reported balance After 2026-10-13 transaction · row 8 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 8 · 2026-10-13 · Exercise / conversion · Disposed 435,363 · Balance 1,533,585

F1: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F8: Fully vested.

Class A Common StockSEC Table I · non-derivativeIndirectSee Footnote7,105,832 Reported balance Holding disclosure · report date 2026-10-13 · row 3 Holding and transaction disclosures are not merged.
1 source row

Row 3 · Balance 7,105,832

F3: The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee.

Class A Common StockSEC Table I · non-derivativeIndirectSee Footnote13,066 Reported balance Holding disclosure · report date 2026-10-13 · row 4 Holding and transaction disclosures are not merged.
1 source row

Row 4 · Balance 13,066

F4: The shares are held by First Virtual Holdings, LLC, of which the Reporting Person is trustee.

Class A Common StockSEC Table I · non-derivativeIndirectSee Footnote37,327 Reported balance Holding disclosure · report date 2026-10-13 · row 5 Holding and transaction disclosures are not merged.
1 source row

Row 5 · Balance 37,327

F5: The shares are held by HS ET DE Investments LLC, of which the Reporting Person is the manager.

Class A Common StockSEC Table I · non-derivativeIndirectSee Footnote54,616 Reported balance Holding disclosure · report date 2026-10-13 · row 6 Holding and transaction disclosures are not merged.
1 source row

Row 6 · Balance 54,616

F6: The shares are held by Siebel Legacy Investments I LLC, of which the Reporting Person is the manager.

Class A Common StockSEC Table I · non-derivativeIndirectSee Footnote1,237,115 Reported balance Holding disclosure · report date 2026-10-13 · row 7 Holding and transaction disclosures are not merged.
1 source row

Row 7 · Balance 1,237,115

F7: The shares are held by Siebel Legacy Investments II LLC, of which the Reporting Person is the manager.

Filing footnotes · ownership attribution and instrument terms

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 $11.565 to $12.0123, 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 shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee.

F4: The shares are held by First Virtual Holdings, LLC, of which the Reporting Person is trustee.

F5: The shares are held by HS ET DE Investments LLC, of which the Reporting Person is the manager.

F6: The shares are held by Siebel Legacy Investments I LLC, of which the Reporting Person is the manager.

F7: The shares are held by Siebel Legacy Investments II LLC, of which the Reporting Person is the manager.

F8: Fully vested.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
June 11, 2026 Filed Jun 16, 2026 00:04 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionRestricted Stock Units · Derivative 44,767 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000060 · wk-form4_1781568269.xml · derivative · entry 11

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 223,994

Underlying: Class A Common Stock · 44,767 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

F11 · derivative.exercise_date: 1/3rd of the RSUs vested on September 11, 2025 and 1/12th of the RSUs shall vest quarterly thereafter, so long as the Reporting Person continues to provide services through such vesting dates.

F11 · derivative.expiration_date: 1/3rd of the RSUs vested on September 11, 2025 and 1/12th of the RSUs shall vest quarterly thereafter, so long as the Reporting Person continues to provide services through such vesting dates.

Read SEC document
June 11, 2026 Filed Jun 16, 2026 00:04 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 44,767 Not disclosed Not disclosed
Disclosure

SEC source: 0001577526-26-000060 · wk-form4_1781568269.xml · nonDerivative · entry 1

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 767,129

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

Read SEC document
June 03, 2026 Filed Jun 3, 2026 21:43 UTC C3.ai, Inc. AI · Entity 2413 GiftClass A Common Stock 6,182,053 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000058 · wk-form4_1780522981.xml · nonDerivative · entry 5

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 6,902,156

F4 · ownership.nature: The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee.

Read SEC document
June 03, 2026 Filed Jun 3, 2026 21:43 UTC C3.ai, Inc. AI · Entity 2413 GiftClass A Common Stock 6,182,053 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000058 · wk-form4_1780522981.xml · nonDerivative · entry 4

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 722,362

Read SEC document
June 02, 2026 Filed Jun 3, 2026 21:43 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 17,350 $11.32 $196,402.00
Disclosure

SEC source: 0001577526-26-000058 · wk-form4_1780522981.xml · nonDerivative · entry 3

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,904,415

F2 · kind: Pursuant to the Issuer's policies and practice, these shares of Class A Common Stock were automatically withheld and sold by the Issuer to satisfy the Reporting Person's tax withholding obligations related to the vesting of RSUs reported herein.

F3 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $11.22 to $11.435, 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.

Read SEC document
June 01, 2026 Filed Jun 3, 2026 21:43 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionStock Option (Right to Buy) · Derivative 6,166,667 $0.00 Strike: $11.16 $0.00
Disclosure

SEC source: 0001577526-26-000058 · wk-form4_1780522981.xml · derivative · entry 11

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 6,166,667 shares

Expires 2030-08-26

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F10 · shares: Due to rounding in connection with the reverse stock split, the total shares include 1 additional share that was not originally reported on the Reporting Person's Form 3.

F11 · derivative.exercise_date: Fully vested.

Read SEC document
June 01, 2026 Filed Jun 3, 2026 21:43 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionRestricted Stock Units · Derivative 32,736 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000058 · wk-form4_1780522981.xml · derivative · entry 10

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,474

Underlying: Class A Common Stock · 32,736 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

F9 · derivative.exercise_date: 1/12th of the RSUs vest on each quarterly anniversary from December 1, 2023, so long as the Reporting Person continues to provide services through such vesting date.

F9 · derivative.expiration_date: 1/12th of the RSUs vest on each quarterly anniversary from December 1, 2023, so long as the Reporting Person continues to provide services through such vesting date.

Read SEC document
June 01, 2026 Filed Jun 3, 2026 21:43 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 6,166,667 $11.16 $68,820,003.72
Disclosure

SEC source: 0001577526-26-000058 · wk-form4_1780522981.xml · nonDerivative · entry 2

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,921,765

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
June 01, 2026 Filed Jun 3, 2026 21:43 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 32,736 Not disclosed Not disclosed
Disclosure

SEC source: 0001577526-26-000058 · wk-form4_1780522981.xml · nonDerivative · entry 1

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 755,098

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

Read SEC document
May 18, 2026 Filed May 19, 2026 22:49 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionStock Option (Right to Buy) · Derivative 112,014 $0.00 Strike: $2.04 $0.00
Disclosure

SEC source: 0001577526-26-000049 · wk-form4_1779230971.xml · derivative · entry 11

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 801,080

Underlying: Class A Common Stock · 112,014 shares

Expires 2027-11-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F9 · derivative.exercise_date: Fully vested.

Read SEC document
May 18, 2026 Filed May 19, 2026 22:49 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 112,014 $8.65 $968,921.10
Disclosure

SEC source: 0001577526-26-000049 · wk-form4_1779230971.xml · nonDerivative · entry 4

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 722,362

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F3 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.34 to $8.81, 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.

Read SEC document
May 18, 2026 Filed May 19, 2026 22:49 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 112,014 $2.04 $228,508.56
Disclosure

SEC source: 0001577526-26-000049 · wk-form4_1779230971.xml · nonDerivative · entry 3

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 834,376

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

Read SEC document
May 15, 2026 Filed May 19, 2026 22:49 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionStock Option (Right to Buy) · Derivative 369,624 $0.00 Strike: $2.04 $0.00
Disclosure

SEC source: 0001577526-26-000049 · wk-form4_1779230971.xml · derivative · entry 10

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 913,094

Underlying: Class A Common Stock · 369,624 shares

Expires 2027-11-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F9 · derivative.exercise_date: Fully vested.

Read SEC document
May 15, 2026 Filed May 19, 2026 22:49 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 369,624 $8.72 $3,223,121.28
Disclosure

SEC source: 0001577526-26-000049 · wk-form4_1779230971.xml · nonDerivative · entry 2

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 722,362

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F2 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.62 to $8.93, 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.

Read SEC document
May 15, 2026 Filed May 19, 2026 22:49 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 369,624 $2.04 $754,032.96
Disclosure

SEC source: 0001577526-26-000049 · wk-form4_1779230971.xml · nonDerivative · entry 1

SIEBEL THOMAS M · CIK 0001031530 · Director · CEO and Chairman of the Board · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,091,986

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

Read SEC document
May 05, 2026 Filed May 5, 2026 22:09 UTC C3.ai, Inc. AI · Entity 2413 GiftClass A Common Stock 25,915 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000046 · wk-form4_1778018954.xml · nonDerivative · entry 4

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 720,103

F4 · ownership.nature: The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee.

Read SEC document
May 05, 2026 Filed May 5, 2026 22:09 UTC C3.ai, Inc. AI · Entity 2413 GiftClass A Common Stock 25,915 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000046 · wk-form4_1778018954.xml · nonDerivative · entry 3

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 722,362

Read SEC document
May 04, 2026 Filed May 5, 2026 22:09 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 27,210 $9.27 $252,236.70
Disclosure

SEC source: 0001577526-26-000046 · wk-form4_1778018954.xml · nonDerivative · entry 2

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 748,277

F2 · kind: Pursuant to the Issuer's policies and practice, these shares of Class A Common Stock were automatically withheld and sold by the Issuer to satisfy the Reporting Person's tax withholding obligations related to the vesting of RSUs reported herein.

F3 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $9.23 to $9.305, 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.

Read SEC document
May 01, 2026 Filed May 5, 2026 22:09 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionRestricted Stock Units · Derivative 53,125 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000046 · wk-form4_1778018954.xml · derivative · entry 9

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 53,125 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

F9 · derivative.exercise_date: 6.25% of the RSU award vested on August 1, 2022 and 6.25% of the RSU award shall vest on a quarterly basis thereafter, so long as the Reporting Person continues to provide services through such vesting date.

F9 · derivative.expiration_date: 6.25% of the RSU award vested on August 1, 2022 and 6.25% of the RSU award shall vest on a quarterly basis thereafter, so long as the Reporting Person continues to provide services through such vesting date.

Read SEC document
May 01, 2026 Filed May 5, 2026 22:09 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 53,125 Not disclosed Not disclosed
Disclosure

SEC source: 0001577526-26-000046 · wk-form4_1778018954.xml · nonDerivative · entry 1

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 775,487

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

Read SEC document
April 14, 2026 Filed Apr 15, 2026 22:00 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionStock Option (Right to Buy) · Derivative 165,278 $0.00 Strike: $2.04 $0.00
Disclosure

SEC source: 0001577526-26-000042 · wk-form4_1776290430.xml · derivative · entry 11

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,282,718

Underlying: Class A Common Stock · 165,278 shares

Expires 2027-11-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F9 · derivative.exercise_date: Fully vested.

Read SEC document
April 14, 2026 Filed Apr 15, 2026 22:00 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 165,278 $8.49 $1,403,210.22
Disclosure

SEC source: 0001577526-26-000042 · wk-form4_1776290430.xml · nonDerivative · entry 4

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 722,362

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F3 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.37 to $8.74, 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.

Read SEC document
April 14, 2026 Filed Apr 15, 2026 22:00 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 165,278 $2.04 $337,167.12
Disclosure

SEC source: 0001577526-26-000042 · wk-form4_1776290430.xml · nonDerivative · entry 3

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 887,640

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

Read SEC document
April 13, 2026 Filed Apr 15, 2026 22:00 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionStock Option (Right to Buy) · Derivative 326,189 $0.00 Strike: $2.04 $0.00
Disclosure

SEC source: 0001577526-26-000042 · wk-form4_1776290430.xml · derivative · entry 10

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,447,996

Underlying: Class A Common Stock · 326,189 shares

Expires 2027-11-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F9 · derivative.exercise_date: Fully vested.

Read SEC document
April 13, 2026 Filed Apr 15, 2026 22:00 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 326,189 $8.31 $2,710,630.59
Disclosure

SEC source: 0001577526-26-000042 · wk-form4_1776290430.xml · nonDerivative · entry 2

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 722,362

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F2 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $7.92 to $8.52, 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.

Read SEC document
April 13, 2026 Filed Apr 15, 2026 22:00 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 326,189 $2.04 $665,425.56
Disclosure

SEC source: 0001577526-26-000042 · wk-form4_1776290430.xml · nonDerivative · entry 1

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,048,551

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

Read SEC document
March 18, 2026 Filed Mar 19, 2026 20:05 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionStock Option (Right to Buy) · Derivative 219,294 $0.00 Strike: $2.04 $0.00
Disclosure

SEC source: 0001577526-26-000032 · wk-form4_1773950721.xml · derivative · entry 11

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,774,185

Underlying: Class A Common Stock · 219,294 shares

Expires 2027-11-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F9 · derivative.exercise_date: Fully vested.

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March 18, 2026 Filed Mar 19, 2026 20:05 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 219,294 $8.67 $1,901,278.98
Disclosure

SEC source: 0001577526-26-000032 · wk-form4_1773950721.xml · nonDerivative · entry 4

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 722,362

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F3 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.56 to $8.83, 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.

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March 18, 2026 Filed Mar 19, 2026 20:05 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 219,294 $2.04 $447,359.76
Disclosure

SEC source: 0001577526-26-000032 · wk-form4_1773950721.xml · nonDerivative · entry 3

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 941,656

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

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March 17, 2026 Filed Mar 19, 2026 20:05 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionStock Option (Right to Buy) · Derivative 282,203 $0.00 Strike: $2.04 $0.00
Disclosure

SEC source: 0001577526-26-000032 · wk-form4_1773950721.xml · derivative · entry 10

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,993,479

Underlying: Class A Common Stock · 282,203 shares

Expires 2027-11-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F9 · derivative.exercise_date: Fully vested.

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March 17, 2026 Filed Mar 19, 2026 20:05 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 282,203 $8.86 $2,500,318.58
Disclosure

SEC source: 0001577526-26-000032 · wk-form4_1773950721.xml · nonDerivative · entry 2

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 722,362

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F2 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.66 to $8.975, 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.

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March 17, 2026 Filed Mar 19, 2026 20:05 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 282,203 $2.04 $575,694.12
Disclosure

SEC source: 0001577526-26-000032 · wk-form4_1773950721.xml · nonDerivative · entry 1

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,004,565

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

Read SEC document
March 13, 2026 Filed Mar 13, 2026 22:32 UTC C3.ai, Inc. AI · Entity 2413 GiftClass A Common Stock 21,331 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000026 · wk-form4_1773441169.xml · nonDerivative · entry 4

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 694,188

F4 · ownership.nature: The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee.

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March 13, 2026 Filed Mar 13, 2026 22:32 UTC C3.ai, Inc. AI · Entity 2413 GiftClass A Common Stock 21,331 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000026 · wk-form4_1773441169.xml · nonDerivative · entry 3

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 722,362

Read SEC document
March 12, 2026 Filed Mar 13, 2026 22:32 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 23,435 $9.11 $213,492.85
Disclosure

SEC source: 0001577526-26-000026 · wk-form4_1773441169.xml · nonDerivative · entry 2

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 743,693

F2 · kind: Pursuant to the Issuer's policies and practice, these shares of Class A Common Stock were automatically withheld and sold by the Issuer to satisfy the Reporting Person's tax withholding obligations related to the vesting of RSUs reported herein.

F3 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $9.055 to $9.16, 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.

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March 11, 2026 Filed Mar 13, 2026 22:32 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionRestricted Stock Units · Derivative 44,766 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000026 · wk-form4_1773441169.xml · derivative · entry 9

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 268,761

Underlying: Class A Common Stock · 44,766 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

F9 · derivative.exercise_date: 1/3rd of the RSUs vested on September 11, 2025 and 1/12th of the RSUs shall vest quarterly thereafter, so long as the Reporting Person continues to provide services through such vesting dates.

F9 · derivative.expiration_date: 1/3rd of the RSUs vested on September 11, 2025 and 1/12th of the RSUs shall vest quarterly thereafter, so long as the Reporting Person continues to provide services through such vesting dates.

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March 11, 2026 Filed Mar 13, 2026 22:32 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 44,766 Not disclosed Not disclosed
Disclosure

SEC source: 0001577526-26-000026 · wk-form4_1773441169.xml · nonDerivative · entry 1

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 767,128

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

Read SEC document
March 03, 2026 Filed Mar 3, 2026 21:20 UTC C3.ai, Inc. AI · Entity 2413 GiftClass A Common Stock 15,081 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000015 · wk-form4_1772572843.xml · nonDerivative · entry 4

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 672,857

F4 · ownership.nature: The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee.

Read SEC document
March 03, 2026 Filed Mar 3, 2026 21:20 UTC C3.ai, Inc. AI · Entity 2413 GiftClass A Common Stock 15,081 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000015 · wk-form4_1772572843.xml · nonDerivative · entry 3

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 722,362

Read SEC document
March 02, 2026 Filed Mar 3, 2026 21:20 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 17,655 $7.79 $137,532.45
Disclosure

SEC source: 0001577526-26-000015 · wk-form4_1772572843.xml · nonDerivative · entry 2

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 737,443

F2 · kind: Pursuant to the Issuer's policies and practice, these shares of Class A Common Stock were automatically withheld and sold by the Issuer to satisfy the Reporting Person's tax withholding obligations related to the vesting of RSUs reported herein.

F3 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $7.75 to $7.82, 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.

Read SEC document
March 01, 2026 Filed Mar 3, 2026 21:20 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionRestricted Stock Units · Derivative 32,736 $0.00 $0.00
Disclosure

SEC source: 0001577526-26-000015 · wk-form4_1772572843.xml · derivative · entry 9

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 98,210

Underlying: Class A Common Stock · 32,736 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

F9 · derivative.exercise_date: 1/12th of the RSUs vest on each quarterly anniversary from December 1, 2023, so long as the Reporting Person continues to provide services through such vesting date.

F9 · derivative.expiration_date: 1/12th of the RSUs vest on each quarterly anniversary from December 1, 2023, so long as the Reporting Person continues to provide services through such vesting date.

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March 01, 2026 Filed Mar 3, 2026 21:20 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 32,736 Not disclosed Not disclosed
Disclosure

SEC source: 0001577526-26-000015 · wk-form4_1772572843.xml · nonDerivative · entry 1

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 755,098

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

Read SEC document
February 10, 2026 Filed Feb 12, 2026 22:00 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionStock Option (Right to Buy) · Derivative 511,732 $0.00 Strike: $2.04 $0.00
Disclosure

SEC source: 0001577526-26-000005 · wk-form4_1770933618.xml · derivative · entry 8

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,275,682

Underlying: Class A Common Stock · 511,732 shares

Expires 2027-11-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F8 · derivative.exercise_date: Fully vested.

Read SEC document
February 10, 2026 Filed Feb 12, 2026 22:00 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 511,732 $11.66 $5,966,795.12
Disclosure

SEC source: 0001577526-26-000005 · wk-form4_1770933618.xml · nonDerivative · entry 2

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 722,362

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

F2 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $11.46 to $12.05, 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.

Read SEC document
February 10, 2026 Filed Feb 12, 2026 22:00 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 511,732 $2.04 $1,043,933.28
Disclosure

SEC source: 0001577526-26-000005 · wk-form4_1770933618.xml · nonDerivative · entry 1

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 1,234,094

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.

Read SEC document
February 03, 2026 Filed Feb 4, 2026 02:26 UTC C3.ai, Inc. AI · Entity 2413 GiftClass A Common Stock 25,520 $0.00 $0.00
Disclosure

SEC source: 0001031530-26-000003 · form4-02042026_020225.xml · nonDerivative · entry 4

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 657,776

F4 · ownership.nature: The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee.

Read SEC document
February 03, 2026 Filed Feb 4, 2026 02:26 UTC C3.ai, Inc. AI · Entity 2413 GiftClass A Common Stock 25,520 $0.00 $0.00
Disclosure

SEC source: 0001031530-26-000003 · form4-02042026_020225.xml · nonDerivative · entry 3

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 722,362

Read SEC document
February 02, 2026 Filed Feb 4, 2026 02:26 UTC C3.ai, Inc. AI · Entity 2413 SaleClass A Common Stock 27,605 $10.81 $298,410.05
Disclosure

SEC source: 0001031530-26-000003 · form4-02042026_020225.xml · nonDerivative · entry 2

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 747,882

F2 · kind: Pursuant to the Issuer's policies and practice, these shares of Class A Common Stock were automatically withheld and sold by the Issuer to satisfy the Reporting Person's tax withholding obligations related to the vesting of RSUs reported herein.

F3 · price: The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $10.64 to $11.02, 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.

Read SEC document
February 01, 2026 Filed Feb 4, 2026 02:26 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionRestricted Stock Units · Derivative 53,125 $0.00 $0.00
Disclosure

SEC source: 0001031530-26-000003 · form4-02042026_020225.xml · derivative · entry 9

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,125

Underlying: Class A Common Stock · 53,125 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

F9 · derivative.exercise_date: 6.25% of the RSU award vested on August 1, 2022 and 6.25% of the RSU award shall vest on a quarterly basis thereafter, so long as the Reporting Person continues to provide services through such vesting date.

F9 · derivative.expiration_date: 6.25% of the RSU award vested on August 1, 2022 and 6.25% of the RSU award shall vest on a quarterly basis thereafter, so long as the Reporting Person continues to provide services through such vesting date.

Read SEC document
February 01, 2026 Filed Feb 4, 2026 02:26 UTC C3.ai, Inc. AI · Entity 2413 Exercise / conversionClass A Common Stock 53,125 Not disclosed Not disclosed
Disclosure

SEC source: 0001031530-26-000003 · form4-02042026_020225.xml · nonDerivative · entry 1

SIEBEL THOMAS M · CIK 0001031530 · Director · Executive Chairman · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 775,487

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Class A Common Stock upon settlement.

Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.