Sell4

Cerebras Systems Inc.

CBRS

Total Value

$153.8M

Net $151.1M sold

Filing Date

Aug 21, 2026

12 transactions

Sales

$151.1M

11 transactions

Trade Summary

On Aug 20, 2026 through Aug 21, 2026, Lie Sean, Chief Technology Officer, sold $153.8M of Cerebras Systems Inc. (CBRS) across 12 transactions. The filing covers Class A Common Stock and reflects net selling of $151.1M. Reported prices ranged from $2.40 to $212.64. Insider transactions are sourced from SEC Form 4 disclosures and should be reviewed alongside company fundamentals and the insider's broader trading history.

Price at the Time of the Trade

CBRS daily price with the insider's sale marked at $207.90.

Sold in the lower half of the 3-month range · the stock trades 6% lower today.

Price data is delayed and provided for context only — not investment advice.

Insider Information

Name: Lie Sean
Role: Chief Technology Officer
Location: SUNNYVALE, CA

Filing Details

Filing Date: Aug 21, 2026
Transaction Date: Aug 20, 2026
Accession Number: 0001628280-26-058506
Form Type: 4
Net Trading Amount: -$151.1M

Non-Derivative Transactions

Date	Security	Shares	Price	Type	Value
Aug 20, 2026	Class A Common Stock	696,798	—	C	—
Aug 20, 2026	Class A Common Stock	213,074	—	Bona Fide Gift	—
Aug 20, 2026	Class A Common Stock	11,706	$203.78	Sale	$2.4M
Aug 20, 2026	Class A Common Stock	47,766	$204.87	Sale	$9.8M
Aug 20, 2026	Class A Common Stock	133,383	$205.67	Sale	$27.4M
Aug 20, 2026	Class A Common Stock	93,017	$206.67	Sale	$19.2M
Aug 20, 2026	Class A Common Stock	108,507	$207.68	Sale	$22.5M
Aug 20, 2026	Class A Common Stock	119,311	$208.69	Sale	$24.9M
Aug 20, 2026	Class A Common Stock	114,976	$209.86	Sale	$24.1M
Aug 20, 2026	Class A Common Stock	46,214	$210.56	Sale	$9.7M
Aug 20, 2026	Class A Common Stock	10,715	$211.42	Sale	$2.3M
Aug 20, 2026	Class A Common Stock	24,652	$212.64	Sale	$5.2M
Aug 21, 2026	Class A Common Stock	16,293	—	C	—
Aug 21, 2026	Class A Common Stock	16,293	$210.01	Sale	$3.4M

Derivative Transactions

Date	Security	Shares	Exercise Price	Type	Value
Aug 20, 2026	CBRS derivative	308,236	$2.40	Exercise	$739.8K
Aug 20, 2026	CBRS derivative	138,236	$2.72	Exercise	$376.0K
Aug 20, 2026	CBRS derivative	87,326	$7.89	Exercise	$689.0K
Aug 20, 2026	CBRS derivative	114,455	$5.02	Exercise	$574.6K
Aug 20, 2026	CBRS derivative	48,545	$5.48	Exercise	$266.0K
Aug 20, 2026	CBRS derivative	696,798	—	Exercise	—
Aug 20, 2026	CBRS derivative	696,798	—	C	—
Aug 21, 2026	CBRS derivative	16,293	$5.48	Exercise	$89.3K
Aug 21, 2026	CBRS derivative	16,293	—	Exercise	—
Aug 21, 2026	CBRS derivative	16,293	—	C	—

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Footnotes

(F1)The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date.
(F2)The reporting person transferred 213,074 shares of the Issuer's common stock to a donor-advised fund sponsored by a charitable organization under Section 501(c)(3) of the Internal Revenue Code.
(F3)The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026.
(F4)The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $203.18 to $204.17, 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.
(F5)The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $204.18 to $205.17, 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.
(F6)The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $205.18 to $206.17, 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.
(F7)The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $206.18 to $207.17, 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.
(F8)The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $207.18 to $208.17, 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.
(F9)The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $208.18 to $209.17, 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.
(F10)The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $209.18 to $210.17, 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.
(F11)The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $210.18 to $211.17, 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.
(F12)The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.21 to $212.12, 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.
(F13)The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $212.22 to $213.16, 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.
(F14)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 $210.16, 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.
(F15)The stock option is fully vested and exercisable.
(F16)The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2023.
(F17)The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024.

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^*

Lie Sean

(Last)

(First)

(Middle)

C/O CEREBRAS SYSTEMS INC.

1237 E. ARQUES AVEUNE

(Street)

SUNNYVALE

94085

(City)

(State)

(Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
08/20/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class A Common Stock	08/20/2026		C		696,798⁽¹⁾	A	⁽¹⁾	1,292,247	D
Class A Common Stock	08/20/2026		G⁽²⁾		213,074	D	$0	1,079,173	D
Class A Common Stock	08/20/2026		S⁽³⁾		11,706	D	$203.78⁽⁴⁾	1,067,467	D
Class A Common Stock	08/20/2026		S⁽³⁾		47,766	D	$204.87⁽⁵⁾	1,019,701	D
Class A Common Stock	08/20/2026		S⁽³⁾		133,383	D	$205.67⁽⁶⁾	886,318	D
Class A Common Stock	08/20/2026		S⁽³⁾		93,017	D	$206.67⁽⁷⁾	793,301	D
Class A Common Stock	08/20/2026		S⁽³⁾		108,507	D	$207.68⁽⁸⁾	684,794	D
Class A Common Stock	08/20/2026		S⁽³⁾		119,311	D	$208.69⁽⁹⁾	565,483	D
Class A Common Stock	08/20/2026		S⁽³⁾		114,976	D	$209.86⁽¹⁰⁾	450,507	D
Class A Common Stock	08/20/2026		S⁽³⁾		46,214	D	$210.56⁽¹¹⁾	404,293	D
Class A Common Stock	08/20/2026		S⁽³⁾		10,715	D	$211.42⁽¹²⁾	393,578	D
Class A Common Stock	08/20/2026		S⁽³⁾		24,652	D	$212.64⁽¹³⁾	368,926	D
Class A Common Stock	08/21/2026		C		16,293	A	$0	385,219	D
Class A Common Stock	08/21/2026		S⁽³⁾		16,293	D	$210.01⁽¹⁴⁾	368,926	D

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Class B Common Stock	⁽¹⁾							⁽¹⁾	⁽¹⁾	Class A Common Stock	180,600		180,600	I	By Spouse
Stock Option	$2.4	08/20/2026		M			308,236	⁽¹⁵⁾	05/13/2029	Class B Common Stock	308,236	$0	41,764	D
Stock Option	$2.72	08/20/2026		M			138,236	⁽¹⁵⁾	12/07/2030	Class B Common Stock	138,236	$0	36,764	D
Stock Option	$7.89	08/20/2026		M			87,326	⁽¹⁵⁾	01/11/2032	Class B Common Stock	87,326	$0	12,674	D
Stock Option	$5.02	08/20/2026		M			114,455	⁽¹⁶⁾	02/13/2033	Class B Common Stock	114,455	$0	35,545	D
Stock Option	$5.48	08/20/2026		M			48,545	⁽¹⁷⁾	02/06/2034	Class B Common Stock	48,545	$0	351,455	D
Class B Common Stock	⁽¹⁾	08/20/2026		M		696,798		⁽¹⁾	⁽¹⁾	Class A Common Stock	696,798	$0⁽¹⁾	8,279,790	D
Class B Common Stock	⁽¹⁾	08/20/2026		C			696,798	⁽¹⁾	⁽¹⁾	Class A Common Stock	696,798	$0	7,582,992	D
Stock Option	$5.48	08/21/2026		M			16,293	⁽¹⁷⁾	02/06/2034	Class B Common Stock	16,293	$0	335,162	D
Class B Common Stock	⁽¹⁾	08/21/2026		M		16,293		⁽¹⁾	⁽¹⁾	Class A Common Stock	16,293	$0	7,599,285	D
Class B Common Stock	⁽¹⁾	08/21/2026		C			16,293	⁽¹⁾	⁽¹⁾	Class A Common Stock	16,293	$0	7,582,992	D

Explanation of Responses:

1. The Class B Common Stock is convertible into an equal number of Class A Common Stock at any time, at the Reporting Person's election, and has no expiration date.

2. The reporting person transferred 213,074 shares of the Issuer's common stock to a donor-advised fund sponsored by a charitable organization under Section 501(c)(3) of the Internal Revenue Code.

3. The sale reported on this Form 4 represents shares sold by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2026.

4. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $203.18 to $204.17, 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 sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $204.18 to $205.17, 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.

6. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $205.18 to $206.17, 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.

7. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $206.18 to $207.17, 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.

8. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $207.18 to $208.17, 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.

9. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $208.18 to $209.17, 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.

10. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $209.18 to $210.17, 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.

11. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $210.18 to $211.17, 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.

12. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $211.21 to $212.12, 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.

13. The sale price reported in Column 4 of Table 1 represents the weighted average sale price of the shares sold ranging from $212.22 to $213.16, 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.

14. 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 $210.16, 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.

15. The stock option is fully vested and exercisable.

16. The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2023.

17. The stock option vests in 48 substantially equal monthly installments beginning on February 1, 2024.

Remarks:

	/s/ Robert Mills, Attorney-in-Fact	08/21/2026
	** 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 as rendered by the SEC from accession 0001628280-26-058506.

Cerebras Systems Inc.

Trade Summary

Price at the Time of the Trade

Company Information

Insider Information

Filing Details

Non-Derivative Transactions

Derivative Transactions

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Footnotes

SEC Form 4

SEC Filing

Price at the Time of the Trade

SEC Form 4