Cerebras Systems officer proposes $6.5M share sale

The notice identifies the proposed sale shares as 32,023 from stock-option exercises and 27,977 performance stock units.

Rhea-AI Filing Summary

Cerebras Systems Inc. (CBRS) officer Sean Lie reported a proposed sale of 60,000 common shares on October 27, 2026, with an aggregate market value of $6,502,200.00. The notice lists 32,023 shares from stock-option exercises and 27,977 performance stock units as the securities to be sold; Morgan Stanley Smith Barney LLC is named in the securities information. For the preceding three months, it also lists Sean Lie sales under a 10b5-1 plan, including 710,247 shares on August 20, 2026, for $147,629,203.38.

Key Figures

Proposed sale: 60,000 common shares Aggregate market value: $6,502,200.00 Shares from stock-option exercise: 32,023 shares +4 more

7 metrics

Proposed sale 60,000 common shares Approximate sale date October 27, 2026

Aggregate market value $6,502,200.00 For the proposed sale of 60,000 common shares

Shares from stock-option exercise 32,023 shares Listed among the securities to be sold

Performance stock units 27,977 shares Listed among the securities to be sold

Issuer shares outstanding 112,247,109 shares Securities information

Prior sale 710,247 shares Sean Lie, August 20, 2026; listed under 10b5-1 sales

Prior sale value $147,629,203.38 Sean Lie, August 20, 2026

Key Terms

Rule 144, 10b5-1 Sales, Performance Stock Units, Exercise of Stock Options

4 terms

Rule 144 regulatory

"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 Sales regulatory

"10b5-1 Sales for SEAN LIE"

10b5-1 sales are pre-arranged stock-trading plans that let company insiders automatically buy or sell shares according to a fixed schedule or formula, even if they later learn confidential information. Think of it as setting up an automatic thermostat for trades: it creates a clear, documented path that can protect insiders from insider-trading accusations and gives investors a signal about predictable insider activity—though it can also simply be a way for insiders to diversify or raise cash.

Performance Stock Units financial

"Performance Stock Units"

Performance stock units are a type of company award that grants employees shares of stock only if certain performance goals are met. They motivate employees to work toward specific company achievements, aligning their interests with those of shareholders. For investors, they can influence a company's future stock supply and reflect management’s confidence in reaching key targets.

Exercise of Stock Options financial

"Exercise of Stock Options"

FAQ

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

How many CBRS shares did Sean Lie report intending to sell?

Sean Lie, identified as an officer, reported a proposed sale of 60,000 Cerebras Systems common shares on October 27, 2026, with an aggregate market value of $6,502,200.00. The notice lists 32,023 shares from stock-option exercises and 27,977 performance stock units.

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

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Available on EDGAR 10/27/2026 - 04:31 PM EDT Accepted by SEC EDGAR 10/27/2026 - 04:30 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	6509334980
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
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	60000	6502200.00	112247109	10/27/2026	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	10/27/2026	Exercise of Stock Options	Issuer			32023	10/27/2026	Cash
Common	04/07/2016	Performance Stock Units	Issuer			27977	04/07/2016	N/A

* 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	09/25/2026	120000	25076334.00
Grounded Love Fund 1237 E. Arques Avenue Sunnyvale CA 94085	Common	09/08/2026	16038	3278844.00
10b5-1 Sales for SEAN LIE 1237 E. Arques Avenue Sunnyvale CA 94085	Common	09/04/2026	53460	11235126.87
Grounded Love Fund 1237 E. Arques Avenue Sunnyvale CA 94085	Common	08/24/2026	4887	913986.29
10b5-1 Sales for SEAN LIE 1237 E. Arques Avenue Sunnyvale CA 94085	Common	08/21/2026	16293	3421670.12
Grounded Love Fund 1237 E. Arques Avenue Sunnyvale CA 94085	Common	08/21/2026	213074	42428338.94
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

144: Remarks and Signature

Remarks
Date of Notice	10/27/2026
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)