Key facts
- This page summarizes Thomas M. Siebel's Form 4 filing for C3.ai, Inc. (AI).
- 8 reported transactions and 6 derivative rows are listed below.
- Accepted by SEC: 02 Oct 2026, 18:27.
Thomas M. Siebel - 30 Sep 2026 Form 4 Insider Report for C3.ai, Inc. (AI)
- Reporting relationship
- CEO and Chairman of the Board, Director, 10%+ Owner
- Issuer ticker
- AI
- Reported as of
- 30 Sep 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 02 Oct 2026, 18:27:04 UTC
- Prior SEC filing
- 17 Sep 2026
- Next SEC filing
- 14 Oct 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Tom MacMitchell, Attorney-in-Fact
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Thomas M. Siebel filed Form 4 for C3.ai, Inc. (AI) on 02 Oct 2026.
Change
- Previous filing in this sequence was filed on 17 Sep 2026.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001031530
Primary reporting owner
SIEBEL THOMAS M
- Relationship
- CEO and Chairman of the Board, Director, 10%+ Owner
- Address
- C/O C3.AI, INC., 1400 SEAPORT BLVD, REDWOOD CITY
- Signature
- /s/ Tom MacMitchell, Attorney-in-Fact
- Signature date
- 02 Oct 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
AI
transaction
Class A Common Stock
Gift
- Transaction value
- Shares
- +239
- Change %
- +0.52%
- Price
- $0.000000*
- Shares after
- 45,822
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Footnotes
- F1, F2
AI
transaction
Class A Common Stock
Gift
- Transaction value
- Shares
- +239
- Change %
- +0.4%
- Price
- $0.000000*
- Shares after
- 59,326
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Footnotes
- F1, F3
AI
transaction
Class A Common Stock
Gift
- Transaction value
- Shares
- +239
- Change %
- +0.61%
- Price
- $0.000000*
- Shares after
- 39,639
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Footnotes
- F1, F4
AI
transaction
Class A Common Stock
Gift
- Transaction value
- Shares
- +239
- Change %
- +10%
- Price
- $0.000000*
- Shares after
- 2,552
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Footnotes
- F1, F5
AI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 722,362
- Date
- 30 Sep 2026
- Ownership
- Direct
AI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 7,105,832
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Footnotes
- F1, F6
AI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 13,066
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Footnotes
- F1, F7
AI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 37,327
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Footnotes
- F1, F8
AI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 54,616
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Footnotes
- F1, F9
AI
holding
Class A Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 1,237,115
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Footnotes
- F10, F11
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
AI
transaction
Derivative
Class B Common Stock
Gift
- Transaction value
- Shares
- +106,793
- Change %
- Price
- $0.000000*
- Shares after
- 106,793
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Underlying class
- Class A Common Stock
- Underlying amount
- 106,793
- Exercise price
- Footnotes
- F2, F12
AI
transaction
Derivative
Class B Common Stock
Gift
- Transaction value
- Shares
- +106,793
- Change %
- Price
- $0.000000*
- Shares after
- 106,793
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Underlying class
- Class A Common Stock
- Underlying amount
- 106,793
- Exercise price
- Footnotes
- F3, F12
AI
transaction
Derivative
Class B Common Stock
Gift
- Transaction value
- Shares
- +106,793
- Change %
- Price
- $0.000000*
- Shares after
- 106,793
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Underlying class
- Class A Common Stock
- Underlying amount
- 106,793
- Exercise price
- Footnotes
- F4, F12
AI
transaction
Derivative
Class B Common Stock
Gift
- Transaction value
- Shares
- +106,793
- Change %
- Price
- $0.000000*
- Shares after
- 106,793
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Underlying class
- Class A Common Stock
- Underlying amount
- 106,793
- Exercise price
- Footnotes
- F5, F12
AI
holding
Derivative
Class B Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 2,072,820
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Underlying class
- Class A Common Stock
- Underlying amount
- 2,072,820
- Exercise price
- Footnotes
- F6, F12
AI
holding
Derivative
Class B Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 500,000
- Date
- 30 Sep 2026
- Ownership
- See Footnote
- Underlying class
- Class A Common Stock
- Underlying amount
- 500,000
- Exercise price
- Footnotes
- F7, F12
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 12 footnotes
Footnote F1
Includes shares of Class A Common Stock received in pro-rata distributions of all 170,294 and 72,695 shares of Class A Common Stock held by Siebel Asset Management L.P. and Siebel Asset Management III, L.P., respectively, to their partners in transactions that constituted a change in beneficial ownership exempt under Rule 16a-13.
Footnote F2
The shares are held by RS DE Investments LLC, of which the Reporting Person is the manager.
Footnote F3
The shares are held by CS DE Investments LLC, of which the Reporting Person is the manager.
Footnote F4
The shares are held by TS DE Investments LLC, of which the Reporting Person is the manager.
Footnote F5
The shares are held by HS DE Investments LLC, of which the Reporting Person is the manager.
Footnote F6
The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee.
Footnote F7
The shares are held by First Virtual Holdings, LLC, of which the Reporting Person is trustee.
Footnote F8
The shares are held by HS ET DE Investments LLC, of which the Reporting Person is the manager.
Footnote F9
The shares are held by Siebel Legacy Investments I LLC, of which the Reporting Person is the manager.
Footnote F10
Represents shares of Class A Common Stock transferred from The Siebel 2011 Irrevocable Children's Trust in a transaction that constituted a change in beneficial ownership exempt under Rule 16a-13.
Footnote F11
The shares are held by Siebel Legacy Investments II LLC, of which the Reporting Person is the manager.
Footnote F12
Each share of Class B Common Stock is convertible at any time at the option of the holder into one share of Class A Common Stock.