As of November 6, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of C3.ai, Inc. The largest reported stake is Thomas M Siebel's, at 15.3%. 9 filings are on record since August 14, 2025 (Schedule 13G/A, May 15, 2026).
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Key facts
- · Reporting person: Thomas M Siebel · Sole voting: 25,556,651 · Shared voting: 0 · Sole dispositive: 25,556,651 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-05-15
- · Reporting person: Vanguard Portfolio Management · Sole voting: 111,760 · Shared voting: 0 · Sole dispositive: 8,655,944 · Shared dispositive: 0 · SCHEDULE 13G, 2026-04-29
- · Reporting person: BlackRock, Inc. · Sole voting: 9,504,586 · Shared voting: 0 · Sole dispositive: 9,694,153 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-04-24
- · Reporting person: The Vanguard Group · Sole voting: 0 · Shared voting: 0 · Sole dispositive: 0 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-03-26
- · Holder: G1 Execution Services, LLC · Percent: 2.9% · SCHEDULE 13G/A
C3.ai, Inc. has 9 Schedule 13D or 13G filings on record since 2025-08-14. 3 holders' latest filing reports 5% or more of class a common stock, $0.001 par value per share. Each figure below is the holder's own, as filed, with the filing linked.
Layoffs on record: 1 filing or notice, latest 2026-02-25 (layoff filings and notices).
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 15.3% | 25,556,651 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 | |
| BlackRock, Inc. | 6.8% | 9,694,153 | SCHEDULE 13G/A, 2026-04-24 | 2026-03-31 |
| Vanguard Portfolio Management | 6.1% | 8,655,944 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| G1 Execution Services, LLC | 2.9% | 3,982,270 | SCHEDULE 13G/A, 2026-02-13 | 2025-12-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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More on C3.ai, Inc. and the records around it.
C3.ai, Inc. elsewhere on the record
- Leadership changes Aug 2026
- Layoff notices Feb 2026
- Who owns it
Companies that share a holder
- G1 Execution Services, LLC also filed stake reports on 45 other companies: AmpliTech Group, Inc. (Aug 2026), Bitdeer Technologies Group (Aug 2026), Compass Diversified Holdings (Aug 2026)
- Vanguard Portfolio Management also filed stake reports on 941 other companies: Newmark Group Inc (Nov 2026), A10 Networks Inc (Oct 2026), ADT Inc (Oct 2026)
- BlackRock, Inc. also filed stake reports on 1596 other companies: AvePoint, Inc. (Nov 2026), BIOMARIN PHARMACEUTICAL INC (Nov 2026), MSG RANGERS CORP (Nov 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Thomas M Siebel | 25,556,651 | 0 | 25,556,651 | 0 | SCHEDULE 13G/A, 2026-05-15 |
| The Siebel Living Trust u/a/d 7/27/93, as amended | 2,767,008 | 0 | 2,767,008 | 0 | SCHEDULE 13G/A, 2026-05-15 |
| Siebel Asset Management, L.P. | 170,294 | 0 | 170,294 | 0 | SCHEDULE 13G/A, 2026-05-15 |
| Siebel Asset Management III, L.P. | 72,695 | 0 | 72,695 | 0 | SCHEDULE 13G/A, 2026-05-15 |
| First Virtual Holdings, LLC | 509,216 | 0 | 509,216 | 0 | SCHEDULE 13G/A, 2026-05-15 |
| The Siebel 2011 Irrevocable Children's Trust | 1,237,115 | 0 | 1,237,115 | 0 | SCHEDULE 13G/A, 2026-05-15 |
| BlackRock, Inc. | 9,504,586 | 0 | 9,694,153 | 0 | SCHEDULE 13G/A, 2026-04-24 |
| Vanguard Portfolio Management | 111,760 | 0 | 8,655,944 | 0 | SCHEDULE 13G, 2026-04-29 |
| The Vanguard Group | 0 | 0 | 0 | 0 | SCHEDULE 13G/A, 2026-03-26 |
The latest filing identifies C3.ai, Inc. by CUSIP 12468P104 and gives its principal executive office as 1400 Seaport Blvd., Redwood City, CA 94063 (SCHEDULE 13G/A, 2026-05-15).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-14 | Thomas M Siebel | 18.6% | SCHEDULE 13G/A |
| 2025-08-14 | G1 Execution Services, LLC | 4.3% | SCHEDULE 13G/A |
| 2025-11-13 | G1 Execution Services, LLC | 5.3% | SCHEDULE 13G |
| 2025-11-14 | Thomas M Siebel | 17.2% | SCHEDULE 13G/A |
| 2026-02-13 | G1 Execution Services, LLC | 2.9% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-24 | BlackRock, Inc. | 6.8% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 6.1% | SCHEDULE 13G |
| 2026-05-15 | Thomas M Siebel | 15.3% | SCHEDULE 13G/A |
Questions about who owns C3.ai, Inc.
Who owns C3.ai, Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of C3.ai, Inc.: Thomas M Siebel (15.3%, Schedule 13G/A, filed 2026-05-15), BlackRock, Inc. (6.8%, Schedule 13G/A, filed 2026-04-24) and Vanguard Portfolio Management (6.1%, Schedule 13G, filed 2026-04-29).
Who are the largest shareholders of C3.ai, Inc.?
By the share each holder's latest filing reports, the largest holders of C3.ai, Inc. on this page are Thomas M Siebel (15.3%), BlackRock, Inc. (6.8%) and Vanguard Portfolio Management (6.1%).
When did Thomas M Siebel buy into C3.ai, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Thomas M Siebel on this page is the Schedule 13G/A, filed 2025-08-14, reporting 18.6%; its latest, Schedule 13G/A filed 2026-05-15, reports 15.3%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 9 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for C3.ai, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| August 27, 2026 | Leadership change: John C. Dwyer appointed, Director | — | Leadership changes | Source |
| June 16, 2026 | Leadership change: Jim H. Snabe departs, Chief Executive Officer | — | Leadership changes | Source |
| May 12, 2026 | Leadership change: Thomas M. Siebel appointed, Chief Executive Officer, and 2 more | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.