VASSALLO STEVEN sold 50.2% of their position (50K shares) of CEREBRAS SYSTEMS INC. on the open market

Open‑market sale worth $10.91M — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 5 sales

VASSALLO STEVEN

Filed: 8/18/2026ACC: 0001567929-26-000003

InsiderVASSALLO STEVENCIK 1567929

→

IssuerCEREBRAS SYSTEMS INC.CIK 2021728

Director

Since May 2026

-1.81M

Net shares

Net seller

$10.91M

Total sold

Open market trades

0B · 5S

Total transactions

2.51M acquired · 4.33M disposed

Non-Derivative Transactions19

Class A Common Stock

Indirect

C · Conversion

+1.39M

Price / share

—

Trade value

—

% of position

New position

6/24/2026

0.00→1.39M

Class A Common Stock

Indirect

C · Conversion

+29.96K

Price / share

—

Trade value

—

% of position

New position

6/24/2026

0.00→29.96K

Class A Common Stock

Indirect

C · Conversion

+109.14K

Price / share

—

Trade value

—

% of position

New position

6/24/2026

0.00→109.14K

Class A Common Stock

Indirect

C · Conversion

+347.78K

Price / share

—

Trade value

—

% of position

25.0%

8/14/2026

1.39M→1.74M

Class A Common Stock

Indirect

C · Conversion

+7.49K

Price / share

—

Trade value

—

% of position

25.0%

8/14/2026

29.96K→37.45K

Class A Common Stock

Indirect

C · Conversion

+27.29K

Price / share

—

Trade value

—

% of position

25.0%

8/14/2026

109.14K→136.43K

Class A Common Stock

Indirect

J · J

−1.74M

Price / share

—

Trade value

—

% of position

New position

8/14/2026

1.74M→0.00

Class A Common Stock

Indirect

J · J

−37.45K

Price / share

—

Trade value

—

% of position

New position

8/14/2026

37.45K→0.00

Class A Common Stock

Indirect

J · J

−136.43K

Price / share

—

Trade value

—

% of position

New position

8/14/2026

136.43K→0.00

Class A Common Stock

Indirect

J · J

+449.88K

Price / share

—

Trade value

—

% of position

New position

8/14/2026

0.00→449.88K

Class A Common Stock

Indirect

J · J

−449.88K

Price / share

—

Trade value

—

% of position

New position

8/14/2026

449.88K→0.00

Class A Common Stock

Indirect

J · J

+1.37K

Price / share

—

Trade value

—

% of position

New position

8/14/2026

0.00→1.37K

Class A Common Stock

Indirect

J · J

+99.60K

Price / share

—

Trade value

—

% of position

New position

8/14/2026

0.00→99.60K

Class A Common Stock

Indirect

J · J

+50.94K

Price / share

—

Trade value

—

% of position

New position

8/14/2026

0.00→50.94K

Class A Common Stock

Indirect

S · Sale

−6.08K

Price / share

$216.38

Trade value

$1.32M

% of position

6.1%

8/14/2026

99.60K→93.52K

Class A Common Stock

Indirect

S · Sale

−16.67K

Price / share

$217.47

Trade value

$3.63M

% of position

17.8%

8/14/2026

93.52K→76.85K

Class A Common Stock

Indirect

S · Sale

−11.83K

Price / share

$218.46

Trade value

$2.59M

% of position

15.4%

8/14/2026

76.85K→65.01K

Class A Common Stock

Indirect

S · Sale

−14.32K

Price / share

$219.41

Trade value

$3.14M

% of position

22.0%

8/14/2026

65.01K→50.69K

Class A Common Stock

Indirect

S · Sale

−1.09K

Price / share

$219.97

Trade value

$239.99K

% of position

2.2%

8/14/2026

50.69K→49.60K

Total

Net shares

+101.91K

Net value

-$10.91M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Indirect	6/24/2026	C · Conversion	+1.39M	—	—	New position	0.00	1.39M
Class A Common Stock Indirect	6/24/2026	C · Conversion	+29.96K	—	—	New position	0.00	29.96K
Class A Common Stock Indirect	6/24/2026	C · Conversion	+109.14K	—	—	New position	0.00	109.14K
Class A Common Stock Indirect	8/14/2026	C · Conversion	+347.78K	—	—	25.0%	1.39M	1.74M
Class A Common Stock Indirect	8/14/2026	C · Conversion	+7.49K	—	—	25.0%	29.96K	37.45K
Class A Common Stock Indirect	8/14/2026	C · Conversion	+27.29K	—	—	25.0%	109.14K	136.43K
Class A Common Stock Indirect	8/14/2026	J · J	−1.74M	—	—	New position	1.74M	0.00
Class A Common Stock Indirect	8/14/2026	J · J	−37.45K	—	—	New position	37.45K	0.00
Class A Common Stock Indirect	8/14/2026	J · J	−136.43K	—	—	New position	136.43K	0.00
Class A Common Stock Indirect	8/14/2026	J · J	+449.88K	—	—	New position	0.00	449.88K
Class A Common Stock Indirect	8/14/2026	J · J	−449.88K	—	—	New position	449.88K	0.00
Class A Common Stock Indirect	8/14/2026	J · J	+1.37K	—	—	New position	0.00	1.37K
Class A Common Stock Indirect	8/14/2026	J · J	+99.60K	—	—	New position	0.00	99.60K
Class A Common Stock Indirect	8/14/2026	J · J	+50.94K	—	—	New position	0.00	50.94K
Class A Common Stock Indirect	8/14/2026	S · Sale	−6.08K	$216.38	$1.32M	6.1%	99.60K	93.52K
Class A Common Stock Indirect	8/14/2026	S · Sale	−16.67K	$217.47	$3.63M	17.8%	93.52K	76.85K
Class A Common Stock Indirect	8/14/2026	S · Sale	−11.83K	$218.46	$2.59M	15.4%	76.85K	65.01K
Class A Common Stock Indirect	8/14/2026	S · Sale	−14.32K	$219.41	$3.14M	22.0%	65.01K	50.69K
Class A Common Stock Indirect	8/14/2026	S · Sale	−1.09K	$219.97	$239.99K	2.2%	50.69K	49.60K
Total			+101.91K		-$10.91M

Derivative Transactions6

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

1.39M shares

−1.39M

Strike price

Held after

12.52M

Exercisable

—

6/24/2026

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

29.96K shares

−29.96K

Strike price

Held after

269.66K

Exercisable

—

6/24/2026

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

109.14K shares

−109.14K

Strike price

Held after

982.27K

Exercisable

—

6/24/2026

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

347.78K shares

−347.78K

Strike price

Held after

12.17M

Exercisable

—

8/14/2026

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

7.49K shares

−7.49K

Strike price

Held after

262.17K

Exercisable

—

8/14/2026

Class B Common Stock

Indirect

C · Conversion

Converts to

Class A Common Stock

27.29K shares

−27.29K

Strike price

Held after

954.99K

Exercisable

—

8/14/2026

Security	Converts To	Date	Type	Shares	Exercisable	Held After
Class B Common Stock Indirect	Class A Common Stock1.39M shares	6/24/2026	C · Conversion	−1.39M	—	12.52M
Class B Common Stock Indirect	Class A Common Stock29.96K shares	6/24/2026	C · Conversion	−29.96K	—	269.66K
Class B Common Stock Indirect	Class A Common Stock109.14K shares	6/24/2026	C · Conversion	−109.14K	—	982.27K
Class B Common Stock Indirect	Class A Common Stock347.78K shares	8/14/2026	C · Conversion	−347.78K	—	12.17M
Class B Common Stock Indirect	Class A Common Stock7.49K shares	8/14/2026	C · Conversion	−7.49K	—	262.17K
Class B Common Stock Indirect	Class A Common Stock27.29K shares	8/14/2026	C · Conversion	−27.29K	—	954.99K