Cerebras officer plans $5.4M stock sale in 2026

Cerebras Systems Inc. (CBRS) reported a planned Rule 144 sale by officer Sean Lie of Class A common stock.

Rhea-AI Filing Summary

Cerebras Systems Inc. (CBRS) reported a planned Rule 144 sale by officer Sean Lie of Class A common stock. The planned sale covers 34,706 shares arising from vesting of restricted stock units on 08/18/2026, with an indicated aggregate market value of about $5,356,338.86, to be handled through Morgan Stanley Smith Barney LLC on NASDAQ. In the prior three months, Lie reported selling 10,033 shares of Class A common stock on 06/25/2026 for an aggregate market value of $1,706,311.13.

Key Figures

Planned shares to be sold: 34,706 shares Planned aggregate market value: $5,356,338.86 Shares sold in prior 3 months: 10,033 shares +2 more

5 metrics

Planned shares to be sold 34,706 shares Class A Common Stock to be sold on 08/18/2026 from vesting of restricted stock units

Planned aggregate market value $5,356,338.86 Aggregate market value for the proposed Rule 144 sale of Class A Common Stock

Shares sold in prior 3 months 10,033 shares Class A Common Stock sold by Sean Lie on 06/25/2026

Aggregate market value of prior sale $1,706,311.13 Aggregate market value of 10,033 shares sold on 06/25/2026

Issuer phone number 650-933-4980 Contact phone for Cerebras Systems Inc.

Key Terms

Rule 144, restricted stock units, aggregate market value

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

restricted stock units financial

"Vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

aggregate market value financial

"5356338.86"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider stock sale is disclosed for CBRS in this Form 144?

Officer Sean Lie plans to sell 34,706 shares of Cerebras Systems Inc. Class A common stock. These shares come from vesting of restricted stock units scheduled for 08/18/2026, with an indicated aggregate market value of about $5.36 million.

When will the planned CBRS share sale by Sean Lie take place?

The planned Rule 144 sale is tied to 08/18/2026. On that date, 34,706 Class A common shares from vested restricted stock units are eligible to be sold, as disclosed in the notice filed for Cerebras Systems Inc. (CBRS).

How many CBRS shares has Sean Lie sold recently before this notice?

In the prior three months, Sean Lie reported selling 10,033 shares of CBRS Class A common stock. That transaction occurred on 06/25/2026 and had an aggregate market value of $1,706,311.13, according to the disclosure.

What is the approximate value of Sean Lie’s planned CBRS share sale?

The planned sale of 34,706 shares of Cerebras Systems Inc. Class A common stock has an indicated aggregate market value of about $5,356,338.86. This value is listed alongside the Rule 144 sale details and NASDAQ trading reference.

Which broker is handling the planned CBRS Rule 144 sale for Sean Lie?

The planned Rule 144 sale for Sean Lie’s CBRS Class A common stock is associated with Morgan Stanley Smith Barney LLC Executive Financial Services. The broker’s office is identified at 1 New York Plaza, with the shares to be sold on NASDAQ.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 08/18/2026 - 08:17 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002132472
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Cerebras Systems Inc.
SEC File Number	001-43284
Address of Issuer	1237 E. Arques Avenue Sunnyvale, CALIFORNIA 94085
Phone	650-933-4980
Name of Person for Whose Account the Securities are To Be Sold	Sean Lie
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Class A Common Stock	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	21257	5356338.86	112247109	08/18/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Class A Common Stock	08/18/2026	Vesting of restricted stock units	Issuer			34706	08/18/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Sean Lie 1237 E. Arques Avenue Sunnyvale, CA 94085	Class A Common Stock	06/25/2026	10033	1706311.13

144: Remarks and Signature

Remarks
Date of Notice	08/18/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Robert Mills, Attorney-in-fact for Sean Lie
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)