Cerebras insider plans $3.4M stock sale

Cerebras Systems Inc. (CBRS) insider Sean Lie filed a notice of proposed sale under Rule 144 for up to 16,293 shares of common stock.

Rhea-AI Filing Summary

Cerebras Systems Inc. (CBRS) insider Sean Lie filed a notice of proposed sale under Rule 144 for up to 16,293 shares of common stock. The shares are to be issued upon the exercise of stock options for cash on or after 08/21/2026, with Morgan Stanley Smith Barney LLC listed as broker.

The filing also lists prior sales of Cerebras common stock during the past three months, including 710,247 shares sold for $147,629,203.38 on 08/20/2026 under a 10b5-1 trading plan, and additional sales of 21,257 shares and 10,955 shares for disclosed aggregate amounts.

Key Figures

Shares proposed for sale: 16,293 shares Aggregate market value for proposed sale: $3,419,086.05 Shares sold 08/20/2026: 710,247 shares +5 more

8 metrics

Shares proposed for sale 16,293 shares Common stock under Rule 144, proposed sale date 08/21/2026

Aggregate market value for proposed sale $3,419,086.05 Associated with 16,293 shares of common stock listed in the filing

Shares sold 08/20/2026 710,247 shares Common stock sold under 10b5-1 plan during past 3 months

Aggregate proceeds 08/20/2026 $147,629,203.38 For 710,247 shares of common stock sold

Shares sold 08/18/2026 21,257 shares Common stock sale disclosed in past 3 months section

Aggregate proceeds 08/18/2026 $4,720,625.00 For 21,257 shares of common stock sold

Shares sold 06/25/2026 10,955 shares Common stock sale disclosed in past 3 months section

Aggregate proceeds 06/25/2026 $1,861,944.73 For 10,955 shares of common stock sold

Key Terms

Rule 144, 10b5-1, Exercise of Stock Options, Aggregate market value

4 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.

10b5-1 regulatory

"10b5-1 Sales for SEAN LIE 1237 E. Arques Avenue Sunnyvale CA 94085"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Exercise of Stock Options financial

"Common | 08/21/2026 | Exercise of Stock Options | Issuer"

Aggregate market value financial

"| 16293 | 3419086.05 | 112247109 | 08/21/2026 | NASDAQ"

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 does the Form 144 filing by Sean Lie mean for CBRS stock?

The filing states that Sean Lie may sell up to 16,293 shares of Cerebras Systems Inc. (CBRS) common stock under Rule 144, from options exercised for cash on or after 08/21/2026, through Morgan Stanley Smith Barney LLC.

How many CBRS shares is Sean Lie planning to sell under this Form 144?

The notice covers a proposed sale of up to 16,293 shares of Cerebras Systems Inc. common stock. These shares are tied to the exercise of stock options for cash with a planned date of 08/21/2026.

Which broker is handling the potential CBRS share sale for Sean Lie?

The broker listed is Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, New York. The filing associates this broker with the proposed sale of 16,293 shares of Cerebras common stock on NASDAQ.

What CBRS shares has Sean Lie sold in the past three months?

Disclosed past 3‑month sales include 710,247 shares for $147,629,203.38 on 08/20/2026 under a 10b5-1 plan, 21,257 shares for $4,720,625.00 on 08/18/2026, and 10,955 shares for $1,861,944.73 on 06/25/2026.

What is the nature of the CBRS securities in Sean Lie’s Form 144?

The securities are common stock of Cerebras Systems Inc., identified with CUSIP 112247109, to be issued upon the exercise of stock options for cash, with the proposed sale date of 08/21/2026 on NASDAQ.

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

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Available on EDGAR 08/21/2026 - 05:24 PM EDT Accepted by SEC EDGAR 08/21/2026 - 05:23 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
Relationship to Issuer	10% Stockholder

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
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	16293	3419086.05	112247109	08/21/2026	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 *
Common	08/21/2026	Exercise of Stock Options	Issuer			16293	08/21/2026	Cash

* 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
10b5-1 Sales for SEAN LIE 1237 E. Arques Avenue Sunnyvale CA 94085	Common	08/20/2026	710247	147629203.38
SEAN LIE 1237 E. Arques Avenue Sunnyvale CA 94085	Common	08/18/2026	21257	4720625.00
SEAN LIE 1237 E. Arques Avenue Sunnyvale CA 94085	Common	06/25/2026	10955	1861944.73

144: Remarks and Signature

Remarks
Date of Notice	08/21/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/20/2026
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/ Sean Lie
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)