Cerebras director sells 50,000 shares via trust

Cerebras Systems Inc. (CBRS) director Steven Vassallo reported indirect sales of a total of 50,000 shares of Class A Common Stock on September 4, 2026, through a revocable family trust.

Rhea-AI Filing Summary

Cerebras Systems Inc. (CBRS) director Steven Vassallo reported indirect sales of a total of 50,000 shares of Class A Common Stock on September 4, 2026, through a revocable family trust. The reported prices are weighted average sale prices across ranges from $209.00–$211.99 per share. Vassallo disclaims beneficial ownership of the trust-held shares except for his proportionate pecuniary interest. A separate irrevocable GST trust associated with him holds 139,618 shares after the reported transactions.

Insider Trade Summary

Net Seller: 50,000 shares

Net Sell 4 txns

Insider Vassallo Steven

Role Director

Sold 50,000 shs ($10.52M)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F1, F2	21,117	$209.81	$4.43M
Sale	Class A Common Stock F3, F2	21,773	$210.37	$4.58M
Sale	Class A Common Stock F4, F2	7,110	$211.56	$1.50M
holding	Class A Common Stock F5	--	--	--

Holdings After Transaction: Class A Common Stock — 171,977 shares (Indirect, By Revocable Trust); Class A Common Stock — 139,618 shares (Indirect, By Irrevocable Trust)

Footnotes (5)

1. F1. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $209.00 to $209.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
2. F2. The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein.
3. F3. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $210.00 to $210.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
4. F4. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.00 to $211.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.
5. F5. The securities are held by an irrevocable GST trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

Key Figures

Shares sold: 50,000 shares Weighted average price range block 1: $209.00–$209.99 per share Weighted average price range block 2: $210.00–$210.99 per share +2 more

5 metrics

Shares sold 50,000 shares Total Class A Common Stock sold indirectly via revocable trust on September 4, 2026

Weighted average price range block 1 $209.00–$209.99 per share Price range for one block of sales reported in a weighted average

Weighted average price range block 2 $210.00–$210.99 per share Price range for second block of sales reported in a weighted average

Weighted average price range block 3 $211.00–$211.99 per share Price range for third block of sales reported in a weighted average

Irrevocable trust holdings 139,618 shares Shares of Class A Common Stock held by an irrevocable GST trust associated with the reporting person

Key Terms

weighted average sale price, revocable family trust, irrevocable GST trust, pecuniary interest

4 terms

weighted average sale price financial

"The sale price reported ... represents the weighted average sale price of the shares sold"

revocable family trust financial

"The securities are held by a revocable family trust, of which the Reporting Person"

irrevocable GST trust financial

"The securities are held by an irrevocable GST trust, of which the Reporting Person"

pecuniary interest financial

"The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest"

FAQ

What insider transaction did CBRS director Steven Vassallo report?

He reported sales of 50,000 shares of Cerebras Systems Inc. Class A Common Stock on September 4, 2026, executed indirectly through a revocable family trust at weighted average prices of about $209–$212 per share.

At what prices were the CBRS shares sold in Steven Vassallo’s Form 4?

The reported prices are weighted average sale prices: one block ranged from $209.00–$209.99, another from $210.00–$210.99, and a third from $211.00–$211.99 per share.

Were Steven Vassallo’s CBRS sales made directly or through an entity?

The 50,000-share sale was reported as indirect ownership “By Revocable Trust”. The securities are held by a revocable family trust where he is a co‑trustee, and he disclaims beneficial ownership except for his proportionate pecuniary interest.

How many CBRS shares does the irrevocable trust associated with Steven Vassallo hold?

An irrevocable GST trust associated with Steven Vassallo is reported as holding 139,618 shares of Cerebras Systems Inc. Class A Common Stock, with beneficial ownership disclaimed except to the extent of his pecuniary interest.

Does the Form 4 indicate a Rule 10b5-1 trading plan for the CBRS sales?

No. The filing’s Rule 10b5‑1 checkbox is not marked as affirming that the reported transactions were made under a Rule 10b5‑1 trading plan.

What role does Steven Vassallo have at Cerebras Systems Inc. (CBRS)?

Steven Vassallo is reported as a director of Cerebras Systems Inc. on this Form 4.

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Available on EDGAR 09/08/2026 - 08:21 PM Accepted by SEC EDGAR 09/08/2026 - 08:20 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Vassallo Steven

(Last) (First) (Middle)

C/O CEREBRAS SYSTEMS INC.

1237 E. ARQUES AVENUE

(Street)

SUNNYVALE CALIFORNIA 94085

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Cerebras Systems Inc. [ CBRS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/04/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	09/04/2026		S		21,117	D	$209.81(1)	200,860	I	By Revocable Trust(2)
Class A Common Stock	09/04/2026		S		21,773	D	$210.37(3)	179,087	I	By Revocable Trust(2)
Class A Common Stock	09/04/2026		S		7,110	D	$211.56(4)	171,977	I	By Revocable Trust(2)
Class A Common Stock								139,618	I	By Irrevocable Trust(5)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $209.00 to $209.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.

2. The securities are held by a revocable family trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his proportionate pecuniary interest therein.

3. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $210.00 to $210.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.

4. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.00 to $211.99, inclusive. Upon request by the staff of the Securities and Exchange commission, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price.

5. The securities are held by an irrevocable GST trust, of which the Reporting Person is a co-trustee. The Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

Remarks:

	/s/ Robert Mills, Attorney-in-fact	09/08/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)