DUDA KENNETH (CTO and SVP Software Eng.) sold 8.7% of their position (43.33K shares) of ARISTA NETWORKS, INC. on the open market

Open‑market sale worth $8.03M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 12 sales

DUDA KENNETH

Filed: 8/24/2026ACC: 0001596532-26-000210

InsiderDUDA KENNETHCIK 1605808

→

IssuerARISTA NETWORKS, INC.CIK 1596532

Officer· CTO and SVP Software Eng.

Since Jul 2018

-63.02K

Net shares

Net seller

$10.93M

Total sold

Open market trades

0B · 12S

Total transactions

48.36K acquired · 111.38K disposed

Non-Derivative Transactions20

Common Stock

Direct

M · Option Exercise

+13.33K

Price / share

$15.28

Trade value

$203.70K

% of position

102.8%

8/20/2026

12.98K→26.31K

Common Stock

Direct

M · Option Exercise

+4K

Price / share

$14.15

Trade value

$56.57K

% of position

15.2%

8/20/2026

26.31K→30.31K

Common Stock

Direct

S · Sale

−4.20K

Price / share

$184.33

Trade value

$773.63K

% of position

13.8%

8/20/2026

30.31K→26.11K

Common Stock

Direct

S · Sale

−5.75K

Price / share

$185.18

Trade value

$1.06M

% of position

22.0%

8/20/2026

26.11K→20.36K

Common Stock

Direct

S · Sale

−6.57K

Price / share

$186.13

Trade value

$1.22M

% of position

32.3%

8/20/2026

20.36K→13.79K

Common Stock

Direct

S · Sale

−818.00

Price / share

$186.97

Trade value

$152.94K

% of position

5.9%

8/20/2026

13.79K→12.98K

Common Stock

Indirect

S · Sale

−3.88K

Price / share

$184.33

Trade value

$714.28K

% of position

0.4%

8/20/2026

1.03M→1.03M

Common Stock

Indirect

S · Sale

−5.31K

Price / share

$185.18

Trade value

$982.95K

% of position

0.5%

8/20/2026

1.03M→1.02M

Common Stock

Indirect

S · Sale

−6.06K

Price / share

$186.13

Trade value

$1.13M

% of position

0.6%

8/20/2026

1.02M→1.02M

Common Stock

Indirect

S · Sale

−754.00

Price / share

$186.97

Trade value

$140.98K

% of position

0.1%

8/20/2026

1.02M→1.02M

Common Stock

Indirect

S · Sale

−2.42K

Price / share

$184.33

Trade value

$446.45K

% of position

0.5%

8/20/2026

462.40K→459.98K

Common Stock

Indirect

S · Sale

−3.32K

Price / share

$185.18

Trade value

$614.25K

% of position

0.7%

8/20/2026

459.98K→456.66K

Common Stock

Indirect

S · Sale

−3.79K

Price / share

$186.13

Trade value

$705.23K

% of position

0.8%

8/20/2026

456.66K→452.87K

Common Stock

Indirect

S · Sale

−472.00

Price / share

$186.97

Trade value

$88.25K

% of position

0.1%

8/20/2026

452.87K→452.40K

Common Stock

Indirect

M · Option Exercise

+3.88K

Price / share

—

Trade value

—

% of position

3.6%

8/20/2026

106.89K→110.77K

Common Stock

Indirect

M · Option Exercise

+4.15K

Price / share

—

Trade value

—

% of position

3.7%

8/20/2026

110.77K→114.92K

Common Stock

Indirect

M · Option Exercise

+1.83K

Price / share

—

Trade value

—

% of position

1.6%

8/20/2026

114.92K→116.75K

Common Stock

Indirect

M · Option Exercise

+19.82K

Price / share

—

Trade value

—

% of position

17.0%

8/20/2026

116.75K→136.57K

Common Stock

Indirect

M · Option Exercise

+1.35K

Price / share

—

Trade value

—

% of position

1.0%

8/20/2026

136.57K→137.92K

Common Stock

Indirect

F · Tax Withholding

−15.54K

Price / share

$186.45

Trade value

$2.90M

% of position

11.3%

8/20/2026

137.92K→122.38K

Total

Net shares

−10.52K

Net value

-$10.67M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	8/20/2026	M · Option Exercise	+13.33K	$15.28	$203.70K	102.8%	12.98K	26.31K
Common Stock Direct	8/20/2026	M · Option Exercise	+4K	$14.15	$56.57K	15.2%	26.31K	30.31K
Common Stock Direct	8/20/2026	S · Sale	−4.20K	$184.33	$773.63K	13.8%	30.31K	26.11K
Common Stock Direct	8/20/2026	S · Sale	−5.75K	$185.18	$1.06M	22.0%	26.11K	20.36K
Common Stock Direct	8/20/2026	S · Sale	−6.57K	$186.13	$1.22M	32.3%	20.36K	13.79K
Common Stock Direct	8/20/2026	S · Sale	−818.00	$186.97	$152.94K	5.9%	13.79K	12.98K
Common Stock Indirect	8/20/2026	S · Sale	−3.88K	$184.33	$714.28K	0.4%	1.03M	1.03M
Common Stock Indirect	8/20/2026	S · Sale	−5.31K	$185.18	$982.95K	0.5%	1.03M	1.02M
Common Stock Indirect	8/20/2026	S · Sale	−6.06K	$186.13	$1.13M	0.6%	1.02M	1.02M
Common Stock Indirect	8/20/2026	S · Sale	−754.00	$186.97	$140.98K	0.1%	1.02M	1.02M
Common Stock Indirect	8/20/2026	S · Sale	−2.42K	$184.33	$446.45K	0.5%	462.40K	459.98K
Common Stock Indirect	8/20/2026	S · Sale	−3.32K	$185.18	$614.25K	0.7%	459.98K	456.66K
Common Stock Indirect	8/20/2026	S · Sale	−3.79K	$186.13	$705.23K	0.8%	456.66K	452.87K
Common Stock Indirect	8/20/2026	S · Sale	−472.00	$186.97	$88.25K	0.1%	452.87K	452.40K
Common Stock Indirect	8/20/2026	M · Option Exercise	+3.88K	—	—	3.6%	106.89K	110.77K
Common Stock Indirect	8/20/2026	M · Option Exercise	+4.15K	—	—	3.7%	110.77K	114.92K
Common Stock Indirect	8/20/2026	M · Option Exercise	+1.83K	—	—	1.6%	114.92K	116.75K
Common Stock Indirect	8/20/2026	M · Option Exercise	+19.82K	—	—	17.0%	116.75K	136.57K
Common Stock Indirect	8/20/2026	M · Option Exercise	+1.35K	—	—	1.0%	136.57K	137.92K
Common Stock Indirect	8/20/2026	F · Tax Withholding	−15.54K	$186.45	$2.90M	11.3%	137.92K	122.38K
Total			−10.52K		-$10.67M

Derivative Transactions8

Non-Qualified Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

4K shares

−4K

Strike price

14.1463

Held after

156K

Exercisable

—

8/20/2026

Non-Qualified Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

13.33K shares

−13.33K

Strike price

15.2769

Held after

0.00

Exercisable

—

8/20/2026

Restricted Stock Unit - 17

Direct

M · Option Exercise

Converts to

Common Stock

1.35K shares

−1.35K

Strike price

0.0

Held after

17.55K

Exercisable

—

8/20/2026

Restricted Stock Unit-11

Direct

M · Option Exercise

Converts to

Common Stock

4.15K shares

−4.15K

Strike price

0.0

Held after

20.74K

Exercisable

—

8/20/2026

Restricted Stock Unit-11

Direct

M · Option Exercise

Converts to

Common Stock

4.15K shares

−4.15K

Strike price

0.0

Held after

16.59K

Exercisable

—

8/20/2026

Restricted Stock Unit-13

Direct

M · Option Exercise

Converts to

Common Stock

1.83K shares

−1.83K

Strike price

0.0

Held after

16.52K

Exercisable

—

8/20/2026

Restricted Stock Unit-14

Direct

M · Option Exercise

Converts to

Common Stock

19.82K shares

−19.82K

Strike price

0.0

Held after

317.06K

Exercisable

—

8/20/2026

Restricted Stock Unit-8

Direct

M · Option Exercise

Converts to

Common Stock

3.88K shares

−3.88K

Strike price

0.0

Held after

3.88K

Exercisable

—

8/20/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Non-Qualified Stock Option (right to buy) Direct	Common Stock4K shares	8/20/2026	M · Option Exercise	−4K	14.1463	—	156K
Non-Qualified Stock Option (right to buy) Direct	Common Stock13.33K shares	8/20/2026	M · Option Exercise	−13.33K	15.2769	—	0.00
Restricted Stock Unit - 17 Direct	Common Stock1.35K shares	8/20/2026	M · Option Exercise	−1.35K	0.0	—	17.55K
Restricted Stock Unit-11 Direct	Common Stock4.15K shares	8/20/2026	M · Option Exercise	−4.15K	0.0	—	20.74K
Restricted Stock Unit-11 Direct	Common Stock4.15K shares	8/20/2026	M · Option Exercise	−4.15K	0.0	—	16.59K
Restricted Stock Unit-13 Direct	Common Stock1.83K shares	8/20/2026	M · Option Exercise	−1.83K	0.0	—	16.52K
Restricted Stock Unit-14 Direct	Common Stock19.82K shares	8/20/2026	M · Option Exercise	−19.82K	0.0	—	317.06K
Restricted Stock Unit-8 Direct	Common Stock3.88K shares	8/20/2026	M · Option Exercise	−3.88K	0.0	—	3.88K

Non-Derivative Holdings (Post-Transaction)2

Common Stock

Indirect

Shares owned756.27K

Common Stock

Indirect

Shares owned757.75K

Total

1.51M indirect1.51M

Security Title	Shares Owned	Ownership Type
Common Stock	756.27K	Indirect
Common Stock	757.75K	Indirect
Total	1.51M	1.51M indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported