Siebel sells 501K C3.ai (NYSE: AI) shares in 10b5-1 option exercise

Rhea-AI Filing Summary

C3.ai, Inc. Executive Chairman Thomas M. Siebel reported an exercise-and-sell transaction under a pre-established Rule 10b5-1 trading plan. On March 17–18, 2026, he exercised stock options for a total of 501,497 shares of Class A Common Stock at an exercise price of $2.04 per share, then sold the same number of shares in open-market transactions.

The reported sales were at weighted-average prices around $8.67 and $8.86, across price ranges disclosed in the filing. Following these transactions, he directly held 722,362 shares of Class A Common Stock, in addition to several indirect holdings through trusts and entities where he serves as trustee, general partner or chairman.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

SIEBEL THOMAS M

(Last) (First) (Middle)

C/O C3.AI, INC.

1400 SEAPORT BLVD, SUITE 500

(Street)

REDWOOD CITY CALIFORNIA 94603

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
C3.ai, Inc. [ AI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Chairman

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/17/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	03/17/2026		M(1)		282,203	A	$2.04	1,004,565	D
Class A Common Stock	03/17/2026		S(1)		282,203	D	$8.86(2)	722,362	D
Class A Common Stock	03/18/2026		M(1)		219,294	A	$2.04	941,656	D
Class A Common Stock	03/18/2026		S(1)		219,294	D	$8.67(3)	722,362	D
Class A Common Stock								694,188	I	See Footnote(4)
Class A Common Stock								9,216	I	See Footnote(5)
Class A Common Stock								170,294	I	See Footnote(6)
Class A Common Stock								72,695	I	See Footnote(7)
Class A Common Stock								1,237,115	I	See Footnote(8)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (Right to Buy)	$2.04	03/17/2026		M(1)			282,203	(9)	11/07/2027	Class A Common Stock	282,203	$0	1,993,479	D
Stock Option (Right to Buy)	$2.04	03/18/2026		M(1)			219,294	(9)	11/07/2027	Class A Common Stock	219,294	$0	1,774,185	D

Explanation of Responses:

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

2. 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.

3. 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.

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

5. The shares are held by First Virtual Holdings, LLC, of which the Reporting Person is Chairman.

6. The shares are held by Siebel Asset Management, L.P., of which the Reporting Person is the general partner.

7. The shares are held by Siebel Asset Management III, L.P., of which the Reporting Person is the general partner.

8. The shares are held by The Siebel 2011 Irrevocable Children's Trust, of which the Reporting Person is co-trustee.

9. Fully vested.

Remarks:

	/s/ Sasha Pesic, Attorney-in-Fact	03/19/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did Thomas M. Siebel report in this C3.ai (AI) Form 4 filing?

Thomas M. Siebel reported exercising stock options for 501,497 C3.ai Class A shares and selling the same number. The transactions occurred on March 17–18, 2026 and were executed under a previously established Rule 10b5-1 trading plan dated September 20, 2024.

How many C3.ai (AI) shares did Siebel sell and at what prices?

Siebel sold 501,497 C3.ai Class A shares in open-market transactions. Weighted-average prices were about $8.67 and $8.86 per share, with actual trades occurring within disclosed ranges between $8.56 and $8.975, according to the detailed price footnotes in the filing.

What options did Siebel exercise in C3.ai (AI) stock?

He exercised stock options covering 501,497 C3.ai Class A shares at an exercise price of $2.04 per share. These stock options were fully vested and had an original expiration date in November 2027, as reflected by the derivative transaction entries.

How many C3.ai (AI) shares does Siebel hold directly after these transactions?

After the reported option exercises and sales, Siebel directly holds 722,362 shares of C3.ai Class A Common Stock. The filing also lists additional indirect holdings in various trusts and entities associated with him, which are separate from his reported direct ownership balance.

Were Siebel’s C3.ai (AI) share sales part of a pre-planned program?

Yes. A footnote states the reported transactions were effected under a previously established Rule 10b5-1 trading plan dated September 20, 2024. Such plans allow insiders to pre-schedule trades, providing structure and reducing the importance of day-to-day timing decisions.

Does Siebel report any indirect holdings of C3.ai (AI) stock?

Yes. The filing shows several indirect positions held through entities such as The Siebel Living Trust, First Virtual Holdings, Siebel Asset Management partnerships and The Siebel 2011 Irrevocable Children's Trust. In each case, Siebel is trustee, general partner or chairman tied to those holdings.