SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 6)

C3.ai, Inc.

(Name of Issuer)

Class A Common Stock, $0.001 par value per share

(Title of Class of Securities)

12468P104

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP Number(s):

12468P104

Names of Reporting Persons

Thomas M Siebel

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 25,556,651.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 25,556,651.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

25,556,651.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

15.3 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP Number(s):

12468P104

Names of Reporting Persons

The Siebel Living Trust u/a/d 7/27/93, as amended

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

CALIFORNIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,767,008.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,767,008.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

2,767,008.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

1.9 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP Number(s):

12468P104

Names of Reporting Persons

Siebel Asset Management, L.P.

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

CALIFORNIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 170,294.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 170,294.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

170,294.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0.1 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP Number(s):

12468P104

Names of Reporting Persons

Siebel Asset Management III, L.P.

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

CALIFORNIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 72,695.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 72,695.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

72,695.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0.1 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP Number(s):

12468P104

Names of Reporting Persons

First Virtual Holdings, LLC

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

CALIFORNIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 509,216.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 509,216.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

509,216.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0.4 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP Number(s):

12468P104

Names of Reporting Persons

The Siebel 2011 Irrevocable Children's Trust

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

CALIFORNIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,237,115.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,237,115.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

1,237,115.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0.9 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

Item 1.

(a)

Name of issuer:

C3.ai, Inc.

(b)

Address of issuer's principal executive offices:

1400 Seaport Blvd., Redwood City, CA, 94063.

Item 2.

(a)

Name of person filing:

Thomas M. Siebel ("Thomas M. Siebel") Siebel Living Trust 1993 Revocable Trust ("Living Trust") Siebel Asset Management, L.P. ("SAM") Siebel Asset Management III, L.P. ("SAM III") First Virtual Holdings, LLC ("First Virtual") The Siebel 2011 Irrevocable Children's Trust ("Children's Trust")

(b)

Address or principal business office or, if none, residence:

c/o C3.ai, Inc. 1400 Seaport Blvd Redwood City, CA 94063

(c)

Citizenship:

Thomas M. Siebel is a citizen of the United States. The other filers are each organized under the laws of the State of California.

(d)

Title of class of securities:

Class A Common Stock, $0.001 par value per share

(e)

CUSIP No.:

12468P104

Item 3.

If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

(a)

Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);

(b)

Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);

(c)

Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);

(d)

Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);

(e)

An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

(f)

An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

(g)

A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h)

A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j)

A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:

(k)

Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).

Item 4.

Ownership

(a)

Amount beneficially owned:

As of March 31, 2026: 3,072,820 shares of the Issuer's Class B Common Stock and 22,483,831 shares of the Issuer's Class A Common Stock, of which (a) 2,072,820 shares of Class B Common Stock and 694,188 shares of Class A Common Stock were held by Living Trust, for which Mr. Siebel serves as trustee, (b) 170,294 shares of Class A Common Stock were held by SAM, for which Mr. Siebel serves as the general partner, (c) 72,695 shares of Class A Common Stock were held by SAM III, for which Mr. Siebel serves as the general partner, (d) 500,000 shares of Class B Common Stock and 9,216 shares of Class A Common Stock were held by First Virtual, for which Mr. Siebel serves as Chairman, (e) 1,237,115 shares of Class A Common Stock were held by Children's Trust, of which Mr. Siebel is trustee, (f) 500,000 shares of Class B Common Stock and 9,216 shares of Class A Common Stock over which Mr. Siebel holds an irrevocable proxy pursuant to a voting agreement between Mr. Siebel and Patricia A. House, (g) 20,237,982 shares of Class A Common Stock that could be issued to Mr. Siebel in connection with the exercise of stock options within 60 days of March 31, 2026 and (h) 53,125 shares of Class A Common Stock that could be issued to Mr. Siebel in connection with the vesting of restricted stock units within 60 days of March 31, 2026. The Class B Common Stock is convertible at the holder's option into the Issuer's Class A Common Stock on a 1-for-1 basis. The holders of Class B Common Stock are entitled to 50 votes per share and the holders of Class A Common Stock are entitled to one vote per share.

(b)

Percent of class:

As of March 31, 2026: (A) Thomas M. Siebel beneficially owned 15.3% of the Issuer's outstanding Class A Common Stock; (B) Living Trust beneficially owned 1.9% of the Issuer's outstanding Class A Common Stock; (C) SAM beneficially owned 0.1% of the Issuer's outstanding Class A Common Stock; (D) SAM III beneficially owned 0.1% of the Issuer's outstanding Class A Common Stock; (E) First Virtual beneficially owned 0.4% of the Issuer's outstanding Class A Common Stock; and (F) Children's Trust beneficially owned 0.9% of the Issuer's outstanding Class A Common Stock. This Amendment No. 6 to Schedule 13G is being filed to report a decrease in Thomas M. Siebel's beneficial ownership of the Issuer's Class A Common Stock (compared to the ownership information last reported on that certain Amendment No. 5 to Schedule 13G filed November 14, 2025) of approximately 1.3%.

(c)

Number of shares as to which the person has:

(i) Sole power to vote or to direct the vote:

Thomas M. Siebel: 25,556,651 Living Trust: 2,767,008 SAM: 170,294 SAM III: 72,695 First Virtual: 509,216 Children's Trust: 1,237,115

(ii) Shared power to vote or to direct the vote:

Thomas M. Siebel: 0 Living Trust: 0 SAM: 0 SAM III: 0 First Virtual: 0 Children's Trust: 0

(iii) Sole power to dispose or to direct the disposition of:

Thomas M. Siebel: 25,556,651 Living Trust: 2,767,008 SAM: 170,294 SAM III: 72,695 First Virtual: 509,216 Children's Trust: 1,237,115

(iv) Shared power to dispose or to direct the disposition of:

Thomas M. Siebel: 0 Living Trust: 0 SAM: 0 SAM III: 0 First Virtual: 0 Children's Trust: 0

Item 5.

Ownership of 5 Percent or Less of a Class.

Not Applicable

Item 6.

Ownership of more than 5 Percent on Behalf of Another Person.

Not Applicable

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not Applicable

Item 8.

Identification and Classification of Members of the Group.

Not Applicable

Item 9.

Notice of Dissolution of Group.

Not Applicable

Item 10.

Certifications:

Not Applicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Thomas M Siebel

Signature:	/s/ Thomas M. Siebel
Name/Title:	Thomas M. Siebel
Date:	05/15/2026

The Siebel Living Trust u/a/d 7/27/93, as amended

Signature:	/s/ Thomas M. Siebel
Name/Title:	Thomas M. Siebel, Trustee of The Siebel Living Trust u/a/d 7/27/93, as amended
Date:	05/15/2026

Siebel Asset Management, L.P.

Signature:	/s/ Thomas M. Siebel
Name/Title:	Thomas M. Siebel, General Partner
Date:	05/15/2026

Siebel Asset Management III, L.P.

Signature:	/s/ Thomas M. Siebel
Name/Title:	Thomas M. Siebel, General Partner
Date:	05/15/2026

First Virtual Holdings, LLC

Signature:	/s/ Thomas M. Siebel
Name/Title:	Thomas M. Siebel, Chairman
Date:	05/15/2026

The Siebel 2011 Irrevocable Children's Trust

Signature:	/s/ Thomas M. Siebel
Name/Title:	Thomas M. Siebel, Trustee of The Siebel 2011 Irrevocable Children's Trust
Date:	05/15/2026

Amendment: SEC Form SCHEDULE 13G/A filed by C3.ai Inc.