Cerebras officer plans $10.2M stock sale

Rhea-AI Filing Summary

Cerebras Systems Inc. (CBRS) received a Rule 144 notice from officer Sean Lie covering the proposed sale of 53,460 shares of common stock, consisting of 7,319 shares from Performance Stock Units vesting on June 5, 2026 and 46,141 shares from stock option exercises on September 4, 2026, through Morgan Stanley Smith Barney LLC.

The filing also lists prior sales of Cerebras common stock during the three months before this notice by Sean Lie and related entities, including several large transactions executed under Rule 10b5‑1 trading plans.

Key Figures

Shares proposed to be sold: 53,460 shares Aggregate market value of proposed sale: $10,180,922.40 Performance Stock Units shares: 7,319 shares +5 more

8 metrics

Shares proposed to be sold 53,460 shares Cerebras common stock covered by the Rule 144 notice

Aggregate market value of proposed sale $10,180,922.40 Value associated with 53,460 shares of Cerebras common stock

Performance Stock Units shares 7,319 shares Common stock from Performance Stock Units dated June 5, 2026

Option exercise shares 46,141 shares Common stock from exercise of stock options dated September 4, 2026

Largest recent sale by Sean Lie 710,247 shares for $147,629,203.38 Sale of Cerebras common stock on August 20, 2026

Recent sale on August 21, 2026 (Grounded Love Fund) 213,074 shares for $42,428,338.94 Cerebras common stock sold during prior three months

Recent sale on August 21, 2026 (10b5‑1 for Sean Lie) 16,293 shares for $3,421,670.12 Cerebras common stock sold under a 10b5‑1 designation

Recent sale on August 18, 2026 21,257 shares for $4,720,625.00 Cerebras common stock sale listed in past three months

Key Terms

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

5 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.

Performance Stock Units financial

"Common | 06/05/2026 | Performance Stock Units | Issuer"

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

"Common | 09/04/2026 | Exercise of Stock Options | Issuer"

10b5-1 regulatory

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

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.

Executive Financial Services financial

"Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza"

FAQ

What does the Form 144 filing by Sean Lie mean for Cerebras Systems (CBRS)?

The Form 144 reports that officer Sean Lie plans to resell 53,460 shares of Cerebras Systems common stock under Rule 144. It is a notice of a potential resale of already-issued shares and does not itself involve new share issuance by the company.

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

The notice covers a proposed sale of 53,460 shares of Cerebras Systems common stock, with an aggregate market value of $10,180,922.40 as reported in the filing.

What is the source of the Cerebras (CBRS) shares being sold by Sean Lie?

The filing states that 7,319 shares come from Performance Stock Units dated June 5, 2026, and 46,141 shares come from the exercise of stock options dated September 4, 2026, both issued by Cerebras Systems.

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

The shares are to be sold through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, New York, as identified in the Form 144 filing.

What Cerebras (CBRS) stock sales has Sean Lie reported in the past three months?

The filing lists several sales, including 710,247 shares on August 20, 2026 for $147,629,203.38 and 213,074 shares on August 21, 2026 for $42,428,338.94, among other smaller transactions, some executed under Rule 10b5‑1 plans.

Are the CBRS shares in this Form 144 sale part of a 10b5-1 trading plan?

The Form 144 explicitly notes 10b5‑1 sales for certain past transactions. The proposed 53,460-share sale itself is reported under Rule 144; the filing does not label that specific future sale as a 10b5‑1 trade.

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

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Available on EDGAR 09/04/2026 - 04:27 PM Accepted by SEC EDGAR 09/04/2026 - 04:26 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	53460	10180922.40	112247109	09/04/2026	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	06/05/2026	Performance Stock Units	Issuer			7319	06/05/2026	N/A
Common	09/04/2026	Exercise of Stock Options	Issuer			46141	09/04/2026	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	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
SEAN LIE 1237 E. Arques Avenue Sunnyvale CA 94085	Common	06/25/2026	10955	1861944.73

144: Remarks and Signature

Remarks
Date of Notice	09/04/2026
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)