FELDMAN ANDREW D. (CEO, President) sold 28.5% of their position (26.64K shares) of CEREBRAS SYSTEMS INC. on the open market

Open‑market sale worth $5.92M — a significant reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 26 sales

FELDMAN ANDREW D.

Filed: 8/20/2026ACC: 0001628280-26-058119

InsiderFELDMAN ANDREW D.CIK 2039573

→

IssuerCEREBRAS SYSTEMS INC.CIK 2021728

DirectorOfficer10% Owner· CEO, President

Since May 2026

-26.35K

Net shares

Net seller

$5.92M

Total sold

Open market trades

0B · 26S

Total transactions

93.80K acquired · 120.14K disposed

Non-Derivative Transactions28

Class A Common Stock

Indirect

J · J

+298.00

Price / share

—

Trade value

—

% of position

111.2%

8/17/2026

268.00→566.00

Class A Common Stock

Direct

C · Conversion

+93.50K

Price / share

—

Trade value

—

% of position

New position

8/18/2026

0.00→93.50K

Class A Common Stock

Direct

S · Sale

−2.00

Price / share

$214.85

Trade value

$429.70

% of position

0.0%

8/18/2026

93.50K→93.50K

Class A Common Stock

Direct

S · Sale

−1.33K

Price / share

$215.67

Trade value

$286.19K

% of position

1.4%

8/18/2026

93.50K→92.17K

Class A Common Stock

Direct

S · Sale

−2.26K

Price / share

$216.40

Trade value

$489.93K

% of position

2.5%

8/18/2026

92.17K→89.90K

Class A Common Stock

Direct

S · Sale

−1.68K

Price / share

$217.58

Trade value

$366.40K

% of position

1.9%

8/18/2026

89.90K→88.22K

Class A Common Stock

Direct

S · Sale

−2.09K

Price / share

$218.54

Trade value

$457.40K

% of position

2.4%

8/18/2026

88.22K→86.13K

Class A Common Stock

Direct

S · Sale

−2.37K

Price / share

$219.58

Trade value

$521.28K

% of position

2.8%

8/18/2026

86.13K→83.75K

Class A Common Stock

Direct

S · Sale

−4.67K

Price / share

$220.43

Trade value

$1.03M

% of position

5.6%

8/18/2026

83.75K→79.09K

Class A Common Stock

Direct

S · Sale

−4.27K

Price / share

$221.47

Trade value

$946.34K

% of position

5.4%

8/18/2026

79.09K→74.81K

Class A Common Stock

Direct

S · Sale

−2K

Price / share

$222.42

Trade value

$445.73K

% of position

2.7%

8/18/2026

74.81K→72.81K

Class A Common Stock

Direct

S · Sale

−616.00

Price / share

$223.54

Trade value

$137.70K

% of position

0.8%

8/18/2026

72.81K→72.19K

Class A Common Stock

Direct

S · Sale

−253.00

Price / share

$224.52

Trade value

$56.80K

% of position

0.4%

8/18/2026

72.19K→71.94K

Class A Common Stock

Direct

S · Sale

−420.00

Price / share

$225.51

Trade value

$94.71K

% of position

0.6%

8/18/2026

71.94K→71.52K

Class A Common Stock

Direct

S · Sale

−573.00

Price / share

$226.46

Trade value

$129.76K

% of position

0.8%

8/18/2026

71.52K→70.95K

Class A Common Stock

Direct

S · Sale

−435.00

Price / share

$227.37

Trade value

$98.91K

% of position

0.6%

8/18/2026

70.95K→70.51K

Class A Common Stock

Direct

S · Sale

−119.00

Price / share

$228.53

Trade value

$27.20K

% of position

0.2%

8/18/2026

70.51K→70.39K

Class A Common Stock

Direct

S · Sale

−184.00

Price / share

$229.46

Trade value

$42.22K

% of position

0.3%

8/18/2026

70.39K→70.21K

Class A Common Stock

Direct

S · Sale

−59.00

Price / share

$230.67

Trade value

$13.61K

% of position

0.1%

8/18/2026

70.21K→70.15K

Class A Common Stock

Direct

S · Sale

−304.00

Price / share

$231.57

Trade value

$70.40K

% of position

0.4%

8/18/2026

70.15K→69.85K

Class A Common Stock

Direct

S · Sale

−347.00

Price / share

$232.62

Trade value

$80.72K

% of position

0.5%

8/18/2026

69.85K→69.50K

Class A Common Stock

Direct

S · Sale

−281.00

Price / share

$233.31

Trade value

$65.56K

% of position

0.4%

8/18/2026

69.50K→69.22K

Class A Common Stock

Direct

S · Sale

−739.00

Price / share

$234.47

Trade value

$173.27K

% of position

1.1%

8/18/2026

69.22K→68.48K

Class A Common Stock

Direct

S · Sale

−377.00

Price / share

$235.50

Trade value

$88.78K

% of position

0.6%

8/18/2026

68.48K→68.10K

Class A Common Stock

Direct

S · Sale

−254.00

Price / share

$236.43

Trade value

$60.05K

% of position

0.4%

8/18/2026

68.10K→67.85K

Class A Common Stock

Direct

S · Sale

−14.00

Price / share

$237.23

Trade value

$3.32K

% of position

0.0%

8/18/2026

67.85K→67.83K

Class A Common Stock

Direct

S · Sale

−12.00

Price / share

$238.78

Trade value

$2.87K

% of position

0.0%

8/18/2026

67.83K→67.82K

Class A Common Stock

Direct

S · Sale

−970.00

Price / share

$240.01

Trade value

$232.81K

% of position

1.4%

8/18/2026

67.82K→66.85K

Total

Net shares

+67.15K

Net value

-$5.92M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Class A Common Stock Indirect	8/17/2026	J · J	+298.00	—	—	111.2%	268.00	566.00
Class A Common Stock Direct	8/18/2026	C · Conversion	+93.50K	—	—	New position	0.00	93.50K
Class A Common Stock Direct	8/18/2026	S · Sale	−2.00	$214.85	$429.70	0.0%	93.50K	93.50K
Class A Common Stock Direct	8/18/2026	S · Sale	−1.33K	$215.67	$286.19K	1.4%	93.50K	92.17K
Class A Common Stock Direct	8/18/2026	S · Sale	−2.26K	$216.40	$489.93K	2.5%	92.17K	89.90K
Class A Common Stock Direct	8/18/2026	S · Sale	−1.68K	$217.58	$366.40K	1.9%	89.90K	88.22K
Class A Common Stock Direct	8/18/2026	S · Sale	−2.09K	$218.54	$457.40K	2.4%	88.22K	86.13K
Class A Common Stock Direct	8/18/2026	S · Sale	−2.37K	$219.58	$521.28K	2.8%	86.13K	83.75K
Class A Common Stock Direct	8/18/2026	S · Sale	−4.67K	$220.43	$1.03M	5.6%	83.75K	79.09K
Class A Common Stock Direct	8/18/2026	S · Sale	−4.27K	$221.47	$946.34K	5.4%	79.09K	74.81K
Class A Common Stock Direct	8/18/2026	S · Sale	−2K	$222.42	$445.73K	2.7%	74.81K	72.81K
Class A Common Stock Direct	8/18/2026	S · Sale	−616.00	$223.54	$137.70K	0.8%	72.81K	72.19K
Class A Common Stock Direct	8/18/2026	S · Sale	−253.00	$224.52	$56.80K	0.4%	72.19K	71.94K
Class A Common Stock Direct	8/18/2026	S · Sale	−420.00	$225.51	$94.71K	0.6%	71.94K	71.52K
Class A Common Stock Direct	8/18/2026	S · Sale	−573.00	$226.46	$129.76K	0.8%	71.52K	70.95K
Class A Common Stock Direct	8/18/2026	S · Sale	−435.00	$227.37	$98.91K	0.6%	70.95K	70.51K
Class A Common Stock Direct	8/18/2026	S · Sale	−119.00	$228.53	$27.20K	0.2%	70.51K	70.39K
Class A Common Stock Direct	8/18/2026	S · Sale	−184.00	$229.46	$42.22K	0.3%	70.39K	70.21K
Class A Common Stock Direct	8/18/2026	S · Sale	−59.00	$230.67	$13.61K	0.1%	70.21K	70.15K
Class A Common Stock Direct	8/18/2026	S · Sale	−304.00	$231.57	$70.40K	0.4%	70.15K	69.85K
Class A Common Stock Direct	8/18/2026	S · Sale	−347.00	$232.62	$80.72K	0.5%	69.85K	69.50K
Class A Common Stock Direct	8/18/2026	S · Sale	−281.00	$233.31	$65.56K	0.4%	69.50K	69.22K
Class A Common Stock Direct	8/18/2026	S · Sale	−739.00	$234.47	$173.27K	1.1%	69.22K	68.48K
Class A Common Stock Direct	8/18/2026	S · Sale	−377.00	$235.50	$88.78K	0.6%	68.48K	68.10K
Class A Common Stock Direct	8/18/2026	S · Sale	−254.00	$236.43	$60.05K	0.4%	68.10K	67.85K
Class A Common Stock Direct	8/18/2026	S · Sale	−14.00	$237.23	$3.32K	0.0%	67.85K	67.83K
Class A Common Stock Direct	8/18/2026	S · Sale	−12.00	$238.78	$2.87K	0.0%	67.83K	67.82K
Class A Common Stock Direct	8/18/2026	S · Sale	−970.00	$240.01	$232.81K	1.4%	67.82K	66.85K
Total			+67.15K		-$5.92M

Derivative Transactions1

Class B Common Stock

Direct

C · Conversion

Converts to

Class A Common Stock

93.50K shares

−93.50K

Strike price

Held after

13.95M

Exercisable

—

8/18/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Class B Common Stock Direct	Class A Common Stock93.50K shares	8/18/2026	C · Conversion	−93.50K		—	13.95M

Non-Derivative Holdings (Post-Transaction)0

No non-derivative holdings reported

Derivative Holdings (Post-Transaction)2

Class B Common Stock

Indirect

Underlying security

Class A Common Stock

Underlying shares

50K

Shares owned

50K

Exercise price

Expiration

—

Exercise window

—

Class B Common Stock

Indirect

Underlying security

Class A Common Stock

Underlying shares

50K

Shares owned

50K

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

100K

Owned

100K

Security	Underlying	Exercise Window	Expiration	Underlying Shares	Shares Owned
Class B Common Stock Indirect	Class A Common Stock	—	—	50K	50K
Class B Common Stock Indirect	Class A Common Stock	—	—	50K	50K
Total				100K	100K