SIEBEL THOMAS M (Chief Executive Officer) sold 3.0% of their position (22.78K shares) of C3.AI, INC. on the open market

Open‑market sale worth $240.6K — a minor trim. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

SIEBEL THOMAS M

Filed: 9/16/2026ACC: 0001577526-26-000128

InsiderSIEBEL THOMAS MCIK 1031530

→

IssuerC3.AI, INC.CIK 1577526

DirectorOfficer10% Owner· Chief Executive Officer

Since Dec 2020

-22.78K

Net shares

Net seller

$240.6K

Total sold

Open market trades

0B · 1S

Total transactions

66.75K acquired · 89.53K disposed

Non-Derivative Transactions4

Class A Common Stock

Direct

M · Option Exercise

+44.77K

Price / share

—

Trade value

—

% of position

6.2%

9/11/2026

722.36K→767.13K

Class A Common Stock

Direct

S · Sale

−22.78K

Price / share

$10.56

Trade value

$240.56K

% of position

3.0%

9/14/2026

767.13K→744.35K

Class A Common Stock

Direct

G · Gift

−21.99K

Price / share

—

Trade value

—

% of position

3.0%

9/14/2026

744.35K→722.36K

Class A Common Stock

Indirect

G · Gift

+21.99K

Price / share

—

Trade value

—

% of position

0.3%

9/14/2026

7.08M→7.11M

Total

Net shares

+21.99K

Net value

-$240.56K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	9/11/2026	M · Option Exercise	+44.77K	—	—	6.2%	722.36K	767.13K
Class A Common Stock Direct	9/14/2026	S · Sale	−22.78K	$10.56	$240.56K	3.0%	767.13K	744.35K
Class A Common Stock Direct	9/14/2026	G · Gift	−21.99K	—	—	3.0%	744.35K	722.36K
Class A Common Stock Indirect	9/14/2026	G · Gift	+21.99K	—	—	0.3%	7.08M	7.11M
Total			+21.99K		-$240.56K

Derivative Transactions1

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Class A Common Stock

44.77K shares

−44.77K

Strike price

Held after

179.23K

Exercisable

—

9/11/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units Direct	Class A Common Stock44.77K shares	9/11/2026	M · Option Exercise	−44.77K		—	179.23K

Non-Derivative Holdings (Post-Transaction)4

Class A Common Stock

Indirect

Shares owned170.29K

Class A Common Stock

Indirect

Shares owned9.22K

Class A Common Stock

Indirect

Shares owned1.24M

Class A Common Stock

Indirect

Shares owned72.69K

Total

1.49M indirect1.49M

Security Title	Shares Owned	Ownership Type
Class A Common Stock	170.29K	Indirect
Class A Common Stock	9.22K	Indirect
Class A Common Stock	1.24M	Indirect
Class A Common Stock	72.69K	Indirect
Total	1.49M	1.49M indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported