Cerebras officer Sean Lie proposes $24.8M share sale

The prior-three-month table lists transactions labeled as 10b5-1 sales for Sean Lie and separate sales by Grounded Love Fund.

Rhea-AI Filing Summary

Cerebras Systems Inc. (CBRS) Officer Sean Lie reported a proposed sale of 120,000 common shares with an aggregate market value of $24,769,200.00. The notice lists September 25, 2026, as the sale date and states that the shares were acquired from the issuer through exercise of stock options for cash. Common shares outstanding were 112,247,109 as of September 25, 2026.

Key Figures

Proposed sale: 120,000 common shares Aggregate market value: $24,769,200.00 Shares outstanding: 112,247,109 shares +1 more

4 metrics

Proposed sale 120,000 common shares Sale date listed as September 25, 2026

Aggregate market value $24,769,200.00 Proposed sale

Shares outstanding 112,247,109 shares As of September 25, 2026

Shares acquired through option exercise 120,000 shares From the issuer for cash on September 25, 2026

Key Terms

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

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 Sales financial

"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.

Aggregate market value financial

"aggregate market value"

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.

Exercise of Stock Options financial

"Exercise of Stock Options"

FAQ

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

What is Sean Lie proposing to sell in CBRS?

Sean Lie, an Officer, reported a proposed sale of 120,000 common shares for an aggregate market value of $24,769,200.00, with September 25, 2026, listed as the sale date. The notice states that the shares were acquired from the issuer through exercise of stock options for cash.

What prior sales does Cerebras's notice list?

The prior-three-month table lists three Grounded Love Fund sales: 16,038 shares for $3,278,844.00 on September 8; 4,887 for $913,986.29 on August 24; and 213,074 for $42,428,338.94 on August 21, 2026. It also lists four Sean Lie sales, three labeled 10b5-1: 53,460 shares for $11,235,126.87 on September 4; 16,293 for $3,421,670.12 on August 21; 710,247 for $147,629,203.38 on August 20; and 21,257 for $4,720,625.00 on August 18, 2026.

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

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Available on EDGAR 09/25/2026 - 04:38 PM Accepted by SEC EDGAR 09/25/2026 - 04:35 PM 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
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	120000	24769200.00	112247109	09/25/2026	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	09/25/2026	Exercise of Stock Options	Issuer			120000	09/25/2026	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
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	09/25/2026
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)