Cerebras Systems CTO sells 45,400 shares in one lot
Lie's sales were made under a Rule 10b5-1 plan adopted May 20, 2026, and he also transferred shares to a donor-advised fund.
Sentiment and the balance of points
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Form Type
4
Rhea-AI Filing Summary
Cerebras Systems Inc. (CBRS) Chief Technology Officer Sean Lie exercised stock options covering 28,898 and 3,125 Class B shares at exercise prices of $5.48 and $5.02, respectively, then converted 32,023 Class B shares into Class A shares on October 27, 2026.
Lie sold 14,500 shares at a weighted average price of $116.82, 45,400 at $115.46, and 100 at $113.92. The sales were made under a Rule 10b5-1 trading plan adopted May 20, 2026. He also transferred 18,000 shares to a donor-advised fund. A separate indirect holding through his spouse was 180,600 Class B shares, convertible one-for-one into Class A shares.
Insider Trade Summary 10b5-1
Exercise and sale activity reported; no spread calculated
Exercise and Sale
10 txns
Insider
Lie Sean
Role
Chief Technology Officer
Sold
60,000 shs ($6.95M)
Approx. gross sale proceeds
$6.95M
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Stock Option F6 | 28,898 | $0.00 | $0.00 |
| Exercise | Stock Option F7 | 3,125 | $0.00 | $0.00 |
| Exercise | Class B Common Stock F1 | 32,023 | $0.00 | $0.00 |
| Conversion | Class B Common Stock F1 | 32,023 | $0.00 | $0.00 |
| Conversion | Class A Common Stock F1 | 32,023 | -- | -- |
| Gift | Class A Common Stock F2 | 18,000 | $0.00 | $0.00 |
| Sale | Class A Common Stock F3, F4 | 14,500 | $116.82 | $1.69M |
| Sale | Class A Common Stock F3, F5 | 45,400 | $115.46 | $5.24M |
| Sale | Class A Common Stock F3 | 100 | $113.92 | $11K |
| holding | Class B Common Stock F1 | -- | -- | -- |
Holdings After Transaction:
Stock Option — 172,543 contracts (Direct);
Class B Common Stock — 7,582,992 contracts (Direct);
Class A Common Stock — 263,592 shares (Direct);
Class B Common Stock — 180,600 contracts (Indirect, By Spouse)
Footnotes (7)
- F1. The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date.
- F2. The reporting person transferred 18,000 shares of the Issuer's common stock to a donor-advised fund sponsored by a charitable organization under Section 501(c)(3) of the Internal Revenue Code.
- F3. The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026.
- F4. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $116.58 to $116.88, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
- F5. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $115.46 to $116.19, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
- F6. The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024.
- F7. The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2023.
Key Figures
Options exercised: 28,898 shares
Options exercised: 3,125 shares
Class B shares converted: 32,023 shares
+5 more
8 metrics
Options exercised
28,898 shares
Class B shares; exercise price $5.48 per share on October 27, 2026
Options exercised
3,125 shares
Class B shares; exercise price $5.02 per share on October 27, 2026
Class B shares converted
32,023 shares
Converted into Class A shares on October 27, 2026
Shares sold
14,500 shares
Weighted average price $116.82 per share; prices ranged from $116.58 to $116.88 on October 27, 2026
Shares sold
45,400 shares
Weighted average price $115.46 per share; prices ranged from $115.46 to $116.19 on October 27, 2026
Shares sold
100 shares
Price $113.92 per share on October 27, 2026
Shares transferred
18,000 shares
Transferred to a donor-advised fund on October 27, 2026
Indirect Class B shares held through spouse
180,600 shares
Convertible one-for-one into Class A shares
Key Terms
Rule 10b5-1 trading plan, donor-advised fund, weighted average sale price, Class B Common Stock
4 terms
Rule 10b5-1 trading plan regulatory
"pursuant to a Rule 10b5-1 trading plan"
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.
donor-advised fund financial
"transferred 18,000 shares ... to a donor-advised fund"
A donor-advised fund is a charitable giving account that lets an individual or family deposit cash, stock, or other assets now, get an immediate tax benefit, and then recommend grants to charities over time. Think of it like a private charitable bucket you control without running a charity yourself; investors care because it’s a tax-efficient way to give appreciated securities, can change when and how donated shares enter the market, and affects personal and corporate tax planning.
weighted average sale price financial
"represents the weighted average sale price"
Class B Common Stock technical
"The Class B Common Stock is convertible into an equal number"
A class B common stock is one of multiple types of a company’s ordinary shares that carries specific rights—often different voting power or dividend priority—compared with other classes. For investors it matters because those differences affect how much influence you have over company decisions, the income you might receive, and how freely the shares trade; think of it like owning a car with different keys: some keys let you start the engine and open the trunk, others only unlock the door.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How many stock options did Sean Lie exercise on October 27, 2026?
Lie exercised options covering 28,898 Class B shares at $5.48 per share and 3,125 Class B shares at $5.02 per share. He then converted 32,023 Class B shares into Class A shares.
AI-generated analysis. How Rhea-AI works. Not financial advice.
