Cerebras CTO Sean Lie sells 120,000 shares
The chief technology officer also reported 180,600 Class B shares held by his spouse, convertible into an equal number of Class A shares at his election.
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Form Type
4
Rhea-AI Filing Summary
Cerebras Systems Inc. (CBRS) Chief Technology Officer Sean Lie reported exercising stock options on September 25, 2026, covering 116,875 Class B shares at $5.48 per share and 3,125 at $5.02. He converted 120,000 Class B shares into 120,000 Class A shares, transferred 36,000 Class A shares to a charitable organization's donor-advised fund, and sold 120,000 Class A shares in nine transactions. Reported sale prices are weighted averages for each transaction, including $212.14 for 500 shares and $204.50 for 2,200 shares. The sales were made under a Rule 10b5-1 trading plan adopted May 20, 2026.
Insider Trade Summary 10b5-1
Exercise and sale activity reported; no spread calculated
Exercise and Sale
16 txns
Insider
Lie Sean
Role
Chief Technology Officer
Sold
120,000 shs ($25.08M)
Approx. gross sale proceeds
$25.08M
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Stock Option F13 | 116,875 | $0.00 | $0.00 |
| Exercise | Stock Option F14 | 3,125 | $0.00 | $0.00 |
| Exercise | Class B Common Stock F1 | 120,000 | $0.00 | $0.00 |
| Conversion | Class B Common Stock F1 | 120,000 | $0.00 | $0.00 |
| Conversion | Class A Common Stock F1 | 120,000 | -- | -- |
| Gift | Class A Common Stock F2 | 36,000 | $0.00 | $0.00 |
| Sale | Class A Common Stock F3, F4 | 500 | $212.14 | $106K |
| Sale | Class A Common Stock F3, F5 | 9,177 | $211.32 | $1.94M |
| Sale | Class A Common Stock F3, F6 | 30,565 | $210.45 | $6.43M |
| Sale | Class A Common Stock F3, F7 | 29,991 | $209.53 | $6.28M |
| Sale | Class A Common Stock F3, F8 | 21,022 | $208.41 | $4.38M |
| Sale | Class A Common Stock F3, F9 | 6,869 | $207.54 | $1.43M |
| Sale | Class A Common Stock F3, F10 | 13,776 | $206.63 | $2.85M |
| Sale | Class A Common Stock F3, F11 | 5,900 | $205.30 | $1.21M |
| Sale | Class A Common Stock F3, F12 | 2,200 | $204.50 | $450K |
| holding | Class B Common Stock F1 | -- | -- | -- |
Holdings After Transaction:
Stock Option — 204,566 contracts (Direct);
Class B Common Stock — 7,582,992 contracts (Direct);
Class A Common Stock — 309,569 shares (Direct);
Class B Common Stock — 180,600 contracts (Indirect, By Spouse)
Footnotes (14)
- 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 36,000 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 $211.97 to $212.31, 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 $210.97 to $211.95, 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 sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $209.97 to $210.96, 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.
- F7. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $208.97 to $209.96, 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.
- F8. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $207.97 to $208.95, 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.
- F9. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $206.96 to $207.95, 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.
- F10. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $205.96 to $206.95, 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.
- F11. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $204.86 to $205.83, 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.
- F12. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $203.86 to $204.83, 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.
- F13. The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024.
- F14. The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2023.
Key Figures
Stock option exercise: 116,875 options; $5.48 per share
Stock option exercise: 3,125 options; $5.02 per share
Class B shares converted: 120,000 shares
+5 more
8 metrics
Stock option exercise
116,875 options; $5.48 per share
Reported for September 25, 2026
Stock option exercise
3,125 options; $5.02 per share
Reported for September 25, 2026
Class B shares converted
120,000 shares
Converted into 120,000 Class A shares on September 25, 2026
Class A shares sold
120,000 shares
Nine transactions reported for September 25, 2026
Class A shares transferred to donor-advised fund
36,000 shares
Reported for September 25, 2026
Weighted-average sale price
$212.14 per share
500-share sale reported for September 25, 2026
Weighted-average sale price
$204.50 per share
2,200-share sale reported for September 25, 2026
Class B shares held by spouse
180,600 shares
Convertible into an equal number of Class A shares
Key Terms
Rule 10b5-1 trading plan, weighted average sale price, donor-advised fund
3 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.
weighted average sale price financial
"represents the weighted average sale price"
donor-advised fund financial
"to a donor-advised fund sponsored by a charitable organization"
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.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How many CBRS stock options did Sean Lie exercise?
On September 25, 2026, he exercised options covering 116,875 Class B shares at $5.48 per share and 3,125 Class B shares at $5.02 per share. He converted 120,000 Class B shares into 120,000 Class A shares that day.
When did the CBRS options Sean Lie exercised begin vesting?
The option covering 116,875 shares vests in 48 substantially equal monthly installments beginning February 1, 2024. The option covering 3,125 shares vests in 48 substantially equal monthly installments beginning February 1, 2023.
AI-generated analysis. How Rhea-AI works. Not financial advice.
