DUDA KENNETH (CTO and SVP Software Eng.) sold 8.9% of their position (43.33K shares) of ARISTA NETWORKS, INC. on the open market

Open‑market sale worth $8.82M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 15 sales

DUDA KENNETH

Filed: 9/23/2026ACC: 0001596532-26-000232

InsiderDUDA KENNETHCIK 1605808

→

IssuerARISTA NETWORKS, INC.CIK 1596532

Officer· CTO and SVP Software Eng.

Since Jul 2018

-43.33K

Net shares

Net seller

$8.82M

Total sold

Open market trades

0B · 15S

Total transactions

17.33K acquired · 60.67K disposed

Non-Derivative Transactions16

Common Stock

Direct

M · Option Exercise

+17.33K

Price / share

$14.15

Trade value

$245.20K

% of position

133.6%

9/21/2026

12.98K→30.31K

Common Stock

Direct

S · Sale

−1.48K

Price / share

$201.70

Trade value

$298.52K

% of position

4.9%

9/21/2026

30.31K→28.83K

Common Stock

Direct

S · Sale

−7.42K

Price / share

$202.66

Trade value

$1.50M

% of position

25.7%

9/21/2026

28.83K→21.41K

Common Stock

Direct

S · Sale

−2.70K

Price / share

$203.49

Trade value

$549.41K

% of position

12.6%

9/21/2026

21.41K→18.71K

Common Stock

Direct

S · Sale

−3.53K

Price / share

$204.78

Trade value

$723.50K

% of position

18.9%

9/21/2026

18.71K→15.18K

Common Stock

Direct

S · Sale

−2.20K

Price / share

$205.50

Trade value

$452.09K

% of position

14.5%

9/21/2026

15.18K→12.98K

Common Stock

Indirect

S · Sale

−1.37K

Price / share

$201.70

Trade value

$275.52K

% of position

0.1%

9/21/2026

1.19M→1.19M

Common Stock

Indirect

S · Sale

−6.85K

Price / share

$202.66

Trade value

$1.39M

% of position

0.6%

9/21/2026

1.19M→1.18M

Common Stock

Indirect

S · Sale

−2.49K

Price / share

$203.49

Trade value

$507.09K

% of position

0.2%

9/21/2026

1.18M→1.18M

Common Stock

Indirect

S · Sale

−3.26K

Price / share

$204.78

Trade value

$668K

% of position

0.3%

9/21/2026

1.18M→1.17M

Common Stock

Indirect

S · Sale

−2.03K

Price / share

$205.50

Trade value

$417.36K

% of position

0.2%

9/21/2026

1.17M→1.17M

Common Stock

Indirect

S · Sale

−854.00

Price / share

$201.70

Trade value

$172.25K

% of position

0.2%

9/21/2026

452.40K→451.55K

Common Stock

Indirect

S · Sale

−4.28K

Price / share

$202.66

Trade value

$867.58K

% of position

0.9%

9/21/2026

451.55K→447.26K

Common Stock

Indirect

S · Sale

−1.56K

Price / share

$203.49

Trade value

$317.03K

% of position

0.3%

9/21/2026

447.26K→445.71K

Common Stock

Indirect

S · Sale

−2.04K

Price / share

$204.78

Trade value

$417.35K

% of position

0.5%

9/21/2026

445.71K→443.67K

Common Stock

Indirect

S · Sale

−1.27K

Price / share

$205.50

Trade value

$260.77K

% of position

0.3%

9/21/2026

443.67K→442.40K

Total

Net shares

−26K

Net value

-$8.57M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	9/21/2026	M · Option Exercise	+17.33K	$14.15	$245.20K	133.6%	12.98K	30.31K
Common Stock Direct	9/21/2026	S · Sale	−1.48K	$201.70	$298.52K	4.9%	30.31K	28.83K
Common Stock Direct	9/21/2026	S · Sale	−7.42K	$202.66	$1.50M	25.7%	28.83K	21.41K
Common Stock Direct	9/21/2026	S · Sale	−2.70K	$203.49	$549.41K	12.6%	21.41K	18.71K
Common Stock Direct	9/21/2026	S · Sale	−3.53K	$204.78	$723.50K	18.9%	18.71K	15.18K
Common Stock Direct	9/21/2026	S · Sale	−2.20K	$205.50	$452.09K	14.5%	15.18K	12.98K
Common Stock Indirect	9/21/2026	S · Sale	−1.37K	$201.70	$275.52K	0.1%	1.19M	1.19M
Common Stock Indirect	9/21/2026	S · Sale	−6.85K	$202.66	$1.39M	0.6%	1.19M	1.18M
Common Stock Indirect	9/21/2026	S · Sale	−2.49K	$203.49	$507.09K	0.2%	1.18M	1.18M
Common Stock Indirect	9/21/2026	S · Sale	−3.26K	$204.78	$668K	0.3%	1.18M	1.17M
Common Stock Indirect	9/21/2026	S · Sale	−2.03K	$205.50	$417.36K	0.2%	1.17M	1.17M
Common Stock Indirect	9/21/2026	S · Sale	−854.00	$201.70	$172.25K	0.2%	452.40K	451.55K
Common Stock Indirect	9/21/2026	S · Sale	−4.28K	$202.66	$867.58K	0.9%	451.55K	447.26K
Common Stock Indirect	9/21/2026	S · Sale	−1.56K	$203.49	$317.03K	0.3%	447.26K	445.71K
Common Stock Indirect	9/21/2026	S · Sale	−2.04K	$204.78	$417.35K	0.5%	445.71K	443.67K
Common Stock Indirect	9/21/2026	S · Sale	−1.27K	$205.50	$260.77K	0.3%	443.67K	442.40K
Total			−26K		-$8.57M

Derivative Transactions1

Non-Qualified Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

17.33K shares

−17.33K

Strike price

14.1463

Held after

138.67K

Exercisable

—

9/21/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Non-Qualified Stock Option (right to buy) Direct	Common Stock17.33K shares	9/21/2026	M · Option Exercise	−17.33K	14.1463	—	138.67K

Non-Derivative Holdings (Post-Transaction)3

Common Stock

Indirect

Shares owned692.10K

Common Stock

Indirect

Shares owned690.62K

Common Stock

Indirect

Shares owned81.93K

Total

1.46M indirect1.46M

Security Title	Shares Owned	Ownership Type
Common Stock	692.10K	Indirect
Common Stock	690.62K	Indirect
Common Stock	81.93K	Indirect
Total	1.46M	1.46M indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported