DUDA KENNETH (CTO and SVP Software Eng.) sold 9.1% of their position (43.33K shares) of ARISTA NETWORKS, INC. on the open market

Open‑market sale worth $7.84M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 18 sales

DUDA KENNETH

Filed: 10/22/2026ACC: 0001596532-26-000248

InsiderDUDA KENNETHCIK 1605808

→

IssuerARISTA NETWORKS, INC.CIK 1596532

Officer· CTO and SVP Software Eng.

Since Jul 2018

-43.33K

Net shares

Net seller

$7.84M

Total sold

Open market trades

0B · 18S

Total transactions

17.33K acquired · 60.67K disposed

Non-Derivative Transactions19

Common Stock

Direct

M · Option Exercise

+17.33K

Price / share

$14.15

Trade value

$245.20K

% of position

133.6%

10/20/2026

12.98K→30.31K

Common Stock

Direct

S · Sale

−649.00

Price / share

$177.91

Trade value

$115.46K

% of position

2.1%

10/20/2026

30.31K→29.66K

Common Stock

Direct

S · Sale

−486.00

Price / share

$179.02

Trade value

$87K

% of position

1.6%

10/20/2026

29.66K→29.17K

Common Stock

Direct

S · Sale

−3.54K

Price / share

$180.12

Trade value

$637.26K

% of position

12.1%

10/20/2026

29.17K→25.64K

Common Stock

Direct

S · Sale

−6.49K

Price / share

$180.93

Trade value

$1.17M

% of position

25.3%

10/20/2026

25.64K→19.15K

Common Stock

Direct

S · Sale

−5.97K

Price / share

$181.78

Trade value

$1.09M

% of position

31.2%

10/20/2026

19.15K→13.18K

Common Stock

Direct

S · Sale

−200.00

Price / share

$182.79

Trade value

$36.56K

% of position

1.5%

10/20/2026

13.18K→12.98K

Common Stock

Indirect

S · Sale

−599.00

Price / share

$177.91

Trade value

$106.57K

% of position

0.1%

10/20/2026

1.17M→1.17M

Common Stock

Indirect

S · Sale

−449.00

Price / share

$179.02

Trade value

$80.38K

% of position

0.0%

10/20/2026

1.17M→1.17M

Common Stock

Indirect

S · Sale

−3.27K

Price / share

$180.12

Trade value

$588.09K

% of position

0.3%

10/20/2026

1.17M→1.17M

Common Stock

Indirect

S · Sale

−5.99K

Price / share

$180.93

Trade value

$1.08M

% of position

0.5%

10/20/2026

1.17M→1.16M

Common Stock

Indirect

S · Sale

−5.51K

Price / share

$181.78

Trade value

$1M

% of position

0.5%

10/20/2026

1.16M→1.16M

Common Stock

Indirect

S · Sale

−185.00

Price / share

$182.79

Trade value

$33.82K

% of position

0.0%

10/20/2026

1.16M→1.15M

Common Stock

Indirect

S · Sale

−374.00

Price / share

$177.91

Trade value

$66.54K

% of position

0.1%

10/20/2026

442.40K→442.03K

Common Stock

Indirect

S · Sale

−281.00

Price / share

$179.02

Trade value

$50.30K

% of position

0.1%

10/20/2026

442.03K→441.75K

Common Stock

Indirect

S · Sale

−2.04K

Price / share

$180.12

Trade value

$367.62K

% of position

0.5%

10/20/2026

441.75K→439.70K

Common Stock

Indirect

S · Sale

−3.74K

Price / share

$180.93

Trade value

$677.04K

% of position

0.9%

10/20/2026

439.70K→435.96K

Common Stock

Indirect

S · Sale

−3.45K

Price / share

$181.78

Trade value

$626.42K

% of position

0.8%

10/20/2026

435.96K→432.52K

Common Stock

Indirect

S · Sale

−116.00

Price / share

$182.79

Trade value

$21.20K

% of position

0.0%

10/20/2026

432.52K→432.40K

Total

Net shares

−26K

Net value

-$7.59M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	10/20/2026	M · Option Exercise	+17.33K	$14.15	$245.20K	133.6%	12.98K	30.31K
Common Stock Direct	10/20/2026	S · Sale	−649.00	$177.91	$115.46K	2.1%	30.31K	29.66K
Common Stock Direct	10/20/2026	S · Sale	−486.00	$179.02	$87K	1.6%	29.66K	29.17K
Common Stock Direct	10/20/2026	S · Sale	−3.54K	$180.12	$637.26K	12.1%	29.17K	25.64K
Common Stock Direct	10/20/2026	S · Sale	−6.49K	$180.93	$1.17M	25.3%	25.64K	19.15K
Common Stock Direct	10/20/2026	S · Sale	−5.97K	$181.78	$1.09M	31.2%	19.15K	13.18K
Common Stock Direct	10/20/2026	S · Sale	−200.00	$182.79	$36.56K	1.5%	13.18K	12.98K
Common Stock Indirect	10/20/2026	S · Sale	−599.00	$177.91	$106.57K	0.1%	1.17M	1.17M
Common Stock Indirect	10/20/2026	S · Sale	−449.00	$179.02	$80.38K	0.0%	1.17M	1.17M
Common Stock Indirect	10/20/2026	S · Sale	−3.27K	$180.12	$588.09K	0.3%	1.17M	1.17M
Common Stock Indirect	10/20/2026	S · Sale	−5.99K	$180.93	$1.08M	0.5%	1.17M	1.16M
Common Stock Indirect	10/20/2026	S · Sale	−5.51K	$181.78	$1M	0.5%	1.16M	1.16M
Common Stock Indirect	10/20/2026	S · Sale	−185.00	$182.79	$33.82K	0.0%	1.16M	1.15M
Common Stock Indirect	10/20/2026	S · Sale	−374.00	$177.91	$66.54K	0.1%	442.40K	442.03K
Common Stock Indirect	10/20/2026	S · Sale	−281.00	$179.02	$50.30K	0.1%	442.03K	441.75K
Common Stock Indirect	10/20/2026	S · Sale	−2.04K	$180.12	$367.62K	0.5%	441.75K	439.70K
Common Stock Indirect	10/20/2026	S · Sale	−3.74K	$180.93	$677.04K	0.9%	439.70K	435.96K
Common Stock Indirect	10/20/2026	S · Sale	−3.45K	$181.78	$626.42K	0.8%	435.96K	432.52K
Common Stock Indirect	10/20/2026	S · Sale	−116.00	$182.79	$21.20K	0.0%	432.52K	432.40K
Total			−26K		-$7.59M

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

121.33K

Exercisable

—

10/20/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Non-Qualified Stock Option (right to buy) Direct	Common Stock17.33K shares	10/20/2026	M · Option Exercise	−17.33K	14.1463	—	121.33K

Non-Derivative Holdings (Post-Transaction)3

Common Stock

Indirect

Shares owned690.62K

Common Stock

Indirect

Shares owned81.93K

Common Stock

Indirect

Shares owned692.10K

Total

1.46M indirect1.46M

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

Derivative Holdings (Post-Transaction)0

No derivative holdings reported