LIE SEAN (Chief Technology Officer) sold 66.3% of their position (726.54K shares) of CEREBRAS SYSTEMS INC. on the open market

Open‑market sale worth $151.05M — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 11 sales

LIE SEAN

Filed: 8/22/2026ACC: 0001628280-26-058506

InsiderLIE SEANCIK 2132472

→

IssuerCEREBRAS SYSTEMS INC.CIK 2021728

Officer10% Owner· Chief Technology Officer

Since May 2026

-939.61K

Net shares

Net seller

$151.05M

Total sold

Open market trades

0B · 11S

Total transactions

1.43M acquired · 2.37M disposed

Non-Derivative Transactions14

Class A Common Stock

Direct

C · Conversion

+696.80K

Price / share

—

Trade value

—

% of position

117.0%

8/20/2026

595.45K→1.29M

Class A Common Stock

Direct

G · Gift

−213.07K

Price / share

—

Trade value

—

% of position

16.5%

8/20/2026

1.29M→1.08M

Class A Common Stock

Direct

S · Sale

−11.71K

Price / share

$203.78

Trade value

$2.39M

% of position

1.1%

8/20/2026

1.08M→1.07M

Class A Common Stock

Direct

S · Sale

−47.77K

Price / share

$204.87

Trade value

$9.79M

% of position

4.5%

8/20/2026

1.07M→1.02M

Class A Common Stock

Direct

S · Sale

−133.38K

Price / share

$205.67

Trade value

$27.43M

% of position

13.1%

8/20/2026

1.02M→886.32K

Class A Common Stock

Direct

S · Sale

−93.02K

Price / share

$206.67

Trade value

$19.22M

% of position

10.5%

8/20/2026

886.32K→793.30K

Class A Common Stock

Direct

S · Sale

−108.51K

Price / share

$207.68

Trade value

$22.53M

% of position

13.7%

8/20/2026

793.30K→684.79K

Class A Common Stock

Direct

S · Sale

−119.31K

Price / share

$208.69

Trade value

$24.90M

% of position

17.4%

8/20/2026

684.79K→565.48K

Class A Common Stock

Direct

S · Sale

−114.98K

Price / share

$209.86

Trade value

$24.13M

% of position

20.3%

8/20/2026

565.48K→450.51K

Class A Common Stock

Direct

S · Sale

−46.21K

Price / share

$210.56

Trade value

$9.73M

% of position

10.3%

8/20/2026

450.51K→404.29K

Class A Common Stock

Direct

S · Sale

−10.71K

Price / share

$211.42

Trade value

$2.27M

% of position

2.7%

8/20/2026

404.29K→393.58K

Class A Common Stock

Direct

S · Sale

−24.65K

Price / share

$212.64

Trade value

$5.24M

% of position

6.3%

8/20/2026

393.58K→368.93K

Class A Common Stock

Direct

C · Conversion

+16.29K

Price / share

—

Trade value

—

% of position

4.4%

8/21/2026

368.93K→385.22K

Class A Common Stock

Direct

S · Sale

−16.29K

Price / share

$210.01

Trade value

$3.42M

% of position

4.2%

8/21/2026

385.22K→368.93K

Total

Net shares

−226.52K

Net value

-$151.05M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Direct	8/20/2026	C · Conversion	+696.80K	—	—	117.0%	595.45K	1.29M
Class A Common Stock Direct	8/20/2026	G · Gift	−213.07K	—	—	16.5%	1.29M	1.08M
Class A Common Stock Direct	8/20/2026	S · Sale	−11.71K	$203.78	$2.39M	1.1%	1.08M	1.07M
Class A Common Stock Direct	8/20/2026	S · Sale	−47.77K	$204.87	$9.79M	4.5%	1.07M	1.02M
Class A Common Stock Direct	8/20/2026	S · Sale	−133.38K	$205.67	$27.43M	13.1%	1.02M	886.32K
Class A Common Stock Direct	8/20/2026	S · Sale	−93.02K	$206.67	$19.22M	10.5%	886.32K	793.30K
Class A Common Stock Direct	8/20/2026	S · Sale	−108.51K	$207.68	$22.53M	13.7%	793.30K	684.79K
Class A Common Stock Direct	8/20/2026	S · Sale	−119.31K	$208.69	$24.90M	17.4%	684.79K	565.48K
Class A Common Stock Direct	8/20/2026	S · Sale	−114.98K	$209.86	$24.13M	20.3%	565.48K	450.51K
Class A Common Stock Direct	8/20/2026	S · Sale	−46.21K	$210.56	$9.73M	10.3%	450.51K	404.29K
Class A Common Stock Direct	8/20/2026	S · Sale	−10.71K	$211.42	$2.27M	2.7%	404.29K	393.58K
Class A Common Stock Direct	8/20/2026	S · Sale	−24.65K	$212.64	$5.24M	6.3%	393.58K	368.93K
Class A Common Stock Direct	8/21/2026	C · Conversion	+16.29K	—	—	4.4%	368.93K	385.22K
Class A Common Stock Direct	8/21/2026	S · Sale	−16.29K	$210.01	$3.42M	4.2%	385.22K	368.93K
Total			−226.52K		-$151.05M

Derivative Transactions10

Stock Option

Direct

M · Option Exercise

Converts to

Class B Common Stock

308.24K shares

−308.24K

Strike price

2.40

Held after

41.76K

Exercisable

—

8/20/2026

Stock Option

Direct

M · Option Exercise

Converts to

Class B Common Stock

138.24K shares

−138.24K

Strike price

2.72

Held after

36.76K

Exercisable

—

8/20/2026

Stock Option

Direct

M · Option Exercise

Converts to

Class B Common Stock

87.33K shares

−87.33K

Strike price

7.89

Held after

12.67K

Exercisable

—

8/20/2026

Stock Option

Direct

M · Option Exercise

Converts to

Class B Common Stock

114.45K shares

−114.45K

Strike price

5.02

Held after

35.55K

Exercisable

—

8/20/2026

Stock Option

Direct

M · Option Exercise

Converts to

Class B Common Stock

48.55K shares

−48.55K

Strike price

5.48

Held after

351.45K

Exercisable

—

8/20/2026

Class B Common Stock

Direct

M · Option Exercise

Converts to

Class A Common Stock

696.80K shares

+696.80K

Strike price

Held after

8.28M

Exercisable

—

8/20/2026

Class B Common Stock

Direct

C · Conversion

Converts to

Class A Common Stock

696.80K shares

−696.80K

Strike price

Held after

7.58M

Exercisable

—

8/20/2026

Stock Option

Direct

M · Option Exercise

Converts to

Class B Common Stock

16.29K shares

−16.29K

Strike price

5.48

Held after

335.16K

Exercisable

—

8/21/2026

Class B Common Stock

Direct

M · Option Exercise

Converts to

Class A Common Stock

16.29K shares

+16.29K

Strike price

Held after

7.60M

Exercisable

—

8/21/2026

Class B Common Stock

Direct

C · Conversion

Converts to

Class A Common Stock

16.29K shares

−16.29K

Strike price

Held after

7.58M

Exercisable

—

8/21/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option Direct	Class B Common Stock308.24K shares	8/20/2026	M · Option Exercise	−308.24K	2.40	—	41.76K
Stock Option Direct	Class B Common Stock138.24K shares	8/20/2026	M · Option Exercise	−138.24K	2.72	—	36.76K
Stock Option Direct	Class B Common Stock87.33K shares	8/20/2026	M · Option Exercise	−87.33K	7.89	—	12.67K
Stock Option Direct	Class B Common Stock114.45K shares	8/20/2026	M · Option Exercise	−114.45K	5.02	—	35.55K
Stock Option Direct	Class B Common Stock48.55K shares	8/20/2026	M · Option Exercise	−48.55K	5.48	—	351.45K
Class B Common Stock Direct	Class A Common Stock696.80K shares	8/20/2026	M · Option Exercise	+696.80K		—	8.28M
Class B Common Stock Direct	Class A Common Stock696.80K shares	8/20/2026	C · Conversion	−696.80K		—	7.58M
Stock Option Direct	Class B Common Stock16.29K shares	8/21/2026	M · Option Exercise	−16.29K	5.48	—	335.16K
Class B Common Stock Direct	Class A Common Stock16.29K shares	8/21/2026	M · Option Exercise	+16.29K		—	7.60M
Class B Common Stock Direct	Class A Common Stock16.29K shares	8/21/2026	C · Conversion	−16.29K		—	7.58M

Non-Derivative Holdings (Post-Transaction)0

No non-derivative holdings reported

Derivative Holdings (Post-Transaction)1

Class B Common Stock

Indirect

Underlying security

Class A Common Stock

Underlying shares

180.60K

Shares owned

180.60K

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

180.60K

Owned

180.60K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Class B Common Stock Indirect	Class A Common Stock		—	—	180.60K	180.60K
Total					180.60K	180.60K