C3.ai CEO Siebel sells 481,638 shares after option exercise
Rhea-AI Filing Summary
C3.ai, Inc. CEO and Chairman Thomas M. Siebel reported paired option exercises and share sales in Class A Common Stock. On May 15 and May 18, 2026, he exercised options to acquire a total of 481,638 shares at $2.04 per share and sold the same number of shares in open-market transactions at weighted-average prices around $8.65–$8.72.
The filing shows he continues to hold 722,362 shares directly after these transactions, as well as additional indirect holdings through several trusts and investment entities referenced in the footnotes. The sales were executed under a previously established Rule 10b5-1 trading plan dated September 20, 2024, indicating they were pre-scheduled rather than discretionary market-timed trades.
Positive
- None.
Negative
- None.
Insider Trade Summary 10b5-1
Exercise and Sale: 481,638 shares ($3.21M approx. pre-tax spread)
Exercise and Sale
11 txns
Insider
SIEBEL THOMAS M
Role
CEO and Chairman of the Board
Sold
481,638 shs ($4.19M)
Approx. gross sale proceeds
$4.19M
Approx. exercise cost
$983K
Approx. pre-tax spread
$3.21M
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Stock Option (Right to Buy) | 112,014 | $0.00 | $0.00 |
| Exercise | Class A Common Stock | 112,014 | $2.04 | $229K |
| Sale | Class A Common Stock | 112,014 | $8.65 | $969K |
| Exercise | Stock Option (Right to Buy) | 369,624 | $0.00 | $0.00 |
| Exercise | Class A Common Stock | 369,624 | $2.04 | $754K |
| Sale | Class A Common Stock | 369,624 | $8.72 | $3.22M |
| holding | Class A Common Stock | -- | -- | -- |
| holding | Class A Common Stock | -- | -- | -- |
| holding | Class A Common Stock | -- | -- | -- |
| holding | Class A Common Stock | -- | -- | -- |
| holding | Class A Common Stock | -- | -- | -- |
Holdings After Transaction:
Stock Option (Right to Buy) — 801,080 shares (Direct);
Class A Common Stock — 722,362 shares (Direct);
Class A Common Stock — 2,209,423 shares (Indirect, See Footnote)
Footnotes (9)
- F1. The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024.
- F2. The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.62 to $8.93, 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.
- F3. The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.34 to $8.81, 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.
- F4. The shares are held by The Siebel Living Trust u/a/d 7/27/93, as amended, of which the Reporting Person is trustee.
- F5. The shares are held by First Virtual Holdings, LLC, of which the Reporting Person is Chairman.
- F6. The shares are held by Siebel Asset Management, L.P., of which the Reporting Person is the general partner.
- F7. The shares are held by Siebel Asset Management III, L.P., of which the Reporting Person is the general partner.
- F8. The shares are held by The Siebel 2011 Irrevocable Children's Trust, of which the Reporting Person is co-trustee.
- F9. Fully vested.
Key Figures
Shares sold: 481,638 shares
Sale price May 15: $8.72 per share
Sale price May 18: $8.65 per share
+5 more
8 metrics
Shares sold
481,638 shares
Open-market sales of Class A Common Stock in May 2026
Sale price May 15
$8.72 per share
Weighted-average price for May 15, 2026 sale
Sale price May 18
$8.65 per share
Weighted-average price for May 18, 2026 sale
Options exercise price
$2.04 per share
Exercise price for stock options converted into common shares
Direct holdings after transactions
722,362 shares
Class A Common Stock held directly by Thomas Siebel after May 2026 trades
Rule 10b5-1 plan date
September 20, 2024
Date of pre-established trading plan governing reported sales
Options exercised
481,638 shares
Total shares underlying stock options exercised in May 2026
Net buy/sell direction
Net-sell of 481,638 shares
Aggregate effect of reported buy/sell activity in this Form 4
Key Terms
Rule 10b5-1 trading plan, weighted-average price, Stock Option (Right to Buy), Class A Common Stock, +2 more
6 terms
Rule 10b5-1 trading plan regulatory
"The transaction being reported was effected pursuant to a previously established Rule 10b5-1 trading plan dated September 20, 2024."
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
weighted-average price financial
"The price reported is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $8.62 to $8.93, inclusive."
Weighted-average price is the average of multiple prices where each price is counted according to its size or importance—larger trades carry more weight than smaller ones, like averaging course grades by credit hours. It matters to investors because it gives a more realistic picture of the true price paid or received, helping assess trade execution, compare performance, calculate cost basis, and value positions more accurately than a simple average.
Stock Option (Right to Buy) financial
"Stock Option (Right to Buy) ... conversion or exercise price: 2.0400 ... underlying security title: Class A Common Stock."
Class A Common Stock financial
"Class A Common Stock transactions on May 15 and May 18, 2026, including option exercises and open-market sales."
Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.
fully vested financial
"Fully vested."
open-market sale financial
"transaction_action: open-market sale ... transaction_code_description: Sale in open market or private transaction."
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
FAQ
What insider transactions did C3.ai (AI) CEO Thomas Siebel report?
Thomas M. Siebel reported exercising stock options and selling shares of C3.ai Class A Common Stock. He exercised 481,638 options at $2.04 per share and sold the same number of shares in open-market transactions, according to the Form 4 filing details.
What stock options did Thomas Siebel exercise in this C3.ai (AI) Form 4?
Siebel exercised stock options covering 481,638 shares of C3.ai Class A Common Stock. The options carried a conversion or exercise price of $2.04 per share and were described as fully vested, with an expiration date of November 7, 2027, in the derivative transactions table.
What indirect C3.ai (AI) holdings are associated with Thomas Siebel?
The Form 4 lists indirect Class A share holdings in entities such as The Siebel Living Trust, First Virtual Holdings, LLC, Siebel Asset Management L.P., Siebel Asset Management III L.P., and The Siebel 2011 Irrevocable Children’s Trust, where Siebel serves as trustee, chairman, general partner or co-trustee.
AI-generated analysis. How Rhea-AI works. Not financial advice.
