Cerebras CTO sells 53,460 shares, donates stock
Cerebras Systems CTO Sean Lie exercised options, gifted shares, and sold 53,460 Class A shares under a pre-arranged Rule 10b5-1 trading plan.
Rhea-AI Filing Summary
Cerebras Systems Inc. (CBRS) Chief Technology Officer Sean Lie reported multiple equity transactions on September 4, 2026. He exercised 46,141 stock options at $5.48 per share into Class B Common Stock and then converted 46,141 Class B into an equal number of Class A shares.
On the same date he made a bona fide gift of 16,038 Class A shares to a donor-advised fund and sold 53,460 Class A shares at a weighted average price of $210.16 per share pursuant to a Rule 10b5-1 trading plan adopted May 20, 2026. After these transactions he held 289,021 stock options directly and an indirect position through his spouse in Class B shares convertible into 180,600 Class A shares.
Positive
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Negative
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Insights
Analyzing...
Insider Trade Summary
Exercise and sale activity reported; no spread calculated
Exercise and Sale
7 txns
Insider
Lie Sean
Role
Chief Technology Officer
Sold
53,460 shs ($11.24M)
Approx. gross sale proceeds
$11.24M
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Exercise | Stock Option F5 | 46,141 | $0.00 | $0.00 |
| Exercise | Class B Common Stock F1 | 46,141 | $0.00 | $0.00 |
| Conversion | Class B Common Stock F1 | 46,141 | $0.00 | $0.00 |
| Conversion | Class A Common Stock F1 | 46,141 | -- | -- |
| Gift | Class A Common Stock F2 | 16,038 | $0.00 | $0.00 |
| Sale | Class A Common Stock F3, F4 | 53,460 | $210.16 | $11.24M |
| holding | Class B Common Stock F1 | -- | -- | -- |
Holdings After Transaction:
Stock Option — 289,021 contracts (Direct);
Class B Common Stock — 7,582,992 contracts (Direct);
Class A Common Stock — 345,569 shares (Direct);
Class B Common Stock — 180,600 contracts (Indirect, By Spouse)
Footnotes (5)
- 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 16,038 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 $210.00 to $210.45, 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 stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024.
Key Figures
Stock options exercised: 46,141 options
Option exercise price: $5.48 per share
Shares converted to Class A: 46,141 shares
+5 more
8 metrics
Stock options exercised
46,141 options
Exercised into Class B Common Stock on September 4, 2026
Option exercise price
$5.48 per share
Exercise price for the 46,141 stock options
Shares converted to Class A
46,141 shares
Class B converted into Class A Common Stock
Class A shares sold
53,460 shares
Sale of Class A Common Stock on September 4, 2026
Weighted average sale price
$210.16 per share
Average price for 53,460 Class A shares sold, range $210.00–$210.45
Gifted Class A shares
16,038 shares
Bona fide gift to a donor-advised charitable fund
Remaining stock options
289,021 options
Stock options held directly after the reported transactions
Indirect Class B holdings
180,600 underlying shares
Class B held indirectly via spouse, convertible into Class A
Key Terms
Rule 10b5-1 trading plan, bona fide gift, donor-advised fund, weighted average sale price, +2 more
6 terms
Rule 10b5-1 trading plan regulatory
"shares sold by the Reporting Person 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.
bona fide gift regulatory
"transaction code description: Bona fide gift"
A bona fide gift is a genuine, voluntary transfer of money, property, or benefits from one party to another made without expectation of repayment, services, or hidden conditions. Investors care because such gifts can affect company disclosures, related‑party transaction rules, tax treatment, and perceived conflicts of interest; think of it like someone giving you a present with no strings attached — but on a corporate scale, auditors and regulators need to verify it really is unconditional.
donor-advised fund financial
"transferred 16,038 shares ... 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.
weighted average sale price financial
"represents the weighted average sale price of the shares sold"
Class B Common Stock financial
"The Class B Common Stock is convertible into an equal number of Class A"
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.
Section 501(c)(3) regulatory
"charitable organization under Section 501(c)(3) of the Internal Revenue Code"
FAQ
What insider transactions did Cerebras Systems (CBRS) CTO Sean Lie report?
Sean Lie reported exercising 46,141 stock options at $5.48, converting those into 46,141 Class A shares, gifting 16,038 Class A shares to a donor-advised fund, and selling 53,460 Class A shares on September 4, 2026.
Did the Cerebras Systems (CBRS) CTO make any charitable gifts of stock?
Yes. Sean Lie transferred 16,038 Class A shares as a bona fide gift to a donor-advised fund sponsored by a charitable organization described in Section 501(c)(3) of the Internal Revenue Code.
What CBRS equity holdings does Sean Lie retain after these transactions?
After the transactions, he held 289,021 stock options directly and an indirect position via his spouse in Class B shares convertible into 180,600 Class A shares, according to the reported post-transaction holdings.
AI-generated analysis. How Rhea-AI works. Not financial advice.
