Arista Networks CTO Kenneth Duda sells 43,333 shares

The reported sales also included shares held through a child’s trust and a 501(c) Foundation.

Rhea-AI Filing Summary

Arista Networks, Inc. President and CTO Kenneth Duda exercised options for 17,333 shares on September 21, 2026, at $14.1463 per share; the option position then represented 138,668 shares. That day, 43,333 common shares were sold from his direct holdings and through a child’s trust and a 501(c) Foundation, at reported weighted-average prices of $201.7000, $202.6575, $203.4866, $204.7833 and $205.4950. The exercise and sales were under Rule 10b5-1 plans entered into March 11, 2026.

Insider Trade Summary 10b5-1

Exercise and sale activity reported; no spread calculated

Exercise and Sale 20 txns

Insider Duda Kenneth

Role President and CTO

Sold 43,333 shs ($8.82M)

Approx. gross sale proceeds $8.82M

Approx. exercise cost $245K

Type	Security	Shares	Price	Value
Exercise	Non-Qualified Stock Option (right to buy) F1, F14	17,333	$0.00	$0.00
Exercise	Common Stock F1	17,333	$14.1463	$245K
Sale	Common Stock F1, F2	1,480	$201.70	$299K
Sale	Common Stock F1, F3	7,420	$202.6575	$1.50M
Sale	Common Stock F1, F4	2,700	$203.4866	$549K
Sale	Common Stock F1, F5	3,533	$204.7833	$723K
Sale	Common Stock F1, F6	2,200	$205.495	$452K
Sale	Common Stock F7, F2, F8	1,366	$201.70	$276K
Sale	Common Stock F7, F3, F8	6,849	$202.6575	$1.39M
Sale	Common Stock F7, F4, F8	2,492	$203.4866	$507K
Sale	Common Stock F7, F5, F8	3,262	$204.7833	$668K
Sale	Common Stock F7, F6, F8	2,031	$205.495	$417K
Sale	Common Stock F9, F2, F10	854	$201.70	$172K
Sale	Common Stock F9, F3, F10	4,281	$202.6575	$868K
Sale	Common Stock F9, F4, F10	1,558	$203.4866	$317K
Sale	Common Stock F9, F5, F10	2,038	$204.7833	$417K
Sale	Common Stock F9, F6, F10	1,269	$205.495	$261K
holding	Common Stock F11	--	--	--
holding	Common Stock F12	--	--	--
holding	Common Stock F13	--	--	--

Holdings After Transaction: Non-Qualified Stock Option (right to buy) — 138,668 contracts (Direct); Common Stock — 12,976 shares (Direct); Common Stock — 1,170,918 shares (Indirect, By Childrens' Trust); Common Stock — 442,400 shares (Indirect, By Foundation); Common Stock — 692,104 shares (Indirect, By GRAT JD); Common Stock — 690,621 shares (Indirect, By GRAT KD); Common Stock — 81,927 shares (Indirect, by Trust)

Footnotes (14)

1. F1. The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2026.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $201.09 to $202.08, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
3. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $202.10 to $203.08, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
4. F4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $203.11 to $203.99, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
5. F5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $204.20 to $205.18, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
6. F6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $205.20 to $205.95, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
7. F7. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person for the benefit of the reporting person's children on March 11, 2026.
8. F8. These shares are held in a trust for the benefit of a Child of the reporting person for which the reporting person serves as co-trustee. The reporting person shares voting and investment control over the shares but disclaims beneficial ownership of the shares.
9. F9. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into on March 11, 2026 by the reporting person's 501(c) Foundation, for which the reporting person and his spouse serve as co-trustee.
10. F10. These shares are held by a 501(c) Foundation for which the reporting person and his spouse serve as co-trustee.
11. F11. Reporting person's spouse is the trustee of the Jennifer Duda Annuity Trusts.
12. F12. Reporting person is the trustee of the Kenneth Duda Annuity Trusts.
13. F13. These shares are held by a family trust for which the reporting person is co-trustee.
14. F14. 1/48th of the shares subject to the option shall vest and become exercisable on December 1, 2020 and 1/48th of the shares subject to the option shall continue to vest each month thereafter.

Key Figures

Options exercised: 17,333 shares Option exercise price: $14.1463 per share Common shares sold: 43,333 shares +2 more

5 metrics

Options exercised 17,333 shares September 21, 2026

Option exercise price $14.1463 per share September 21, 2026

Common shares sold 43,333 shares September 21, 2026; direct and indirect holdings

Reported weighted-average sale prices $201.7000, $202.6575, $203.4866, $204.7833 and $205.4950 per share Sales reported for September 21, 2026

Option position after exercise 138,668 shares Position following the September 21, 2026 exercise

Key Terms

Non-Qualified Stock Option, Rule 10b5-1 trading plan, weighted average price

3 terms

Non-Qualified Stock Option technical

"Non-Qualified Stock Option (right to buy)"

A non-qualified stock option (NSO) is a contract that lets an employee or service provider buy company shares at a fixed price for a set period, like a voucher to purchase stock later at today’s price. It matters to investors because exercising NSOs creates ordinary income for the holder and can increase share count, affecting a company’s earnings and ownership mix; think of it as a future sale that can dilute existing shareholders and has immediate tax consequences for the recipient.

Rule 10b5-1 trading plan regulatory

"pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many ANET shares did Kenneth Duda exercise and sell?

On September 21, 2026, Kenneth Duda exercised options for 17,333 shares at $14.1463 per share and reported sales of 43,333 common shares. The reported weighted-average sale prices were $201.7000, $202.6575, $203.4866, $204.7833 and $205.4950 per share.

Did Kenneth Duda beneficially own the ANET shares held in the child’s trust?

Kenneth Duda disclaimed beneficial ownership of the shares held in a trust for a child. He served as co-trustee and shared voting and investment control over those shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/23/2026 - 07:05 PM Accepted by SEC EDGAR 09/23/2026 - 07:05 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Duda Kenneth

(Last) (First) (Middle)

5453 GREAT AMERICA PARKWAY

(Street)

SANTA CLARA CALIFORNIA 95054

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Arista Networks, Inc. [ ANET ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CTO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/21/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/21/2026		M(1)		17,333	A	$14.1463	30,309	D
Common Stock	09/21/2026		S(1)		1,480	D	$201.7(2)	28,829	D
Common Stock	09/21/2026		S(1)		7,420	D	$202.6575(3)	21,409	D
Common Stock	09/21/2026		S(1)		2,700	D	$203.4866(4)	18,709	D
Common Stock	09/21/2026		S(1)		3,533	D	$204.7833(5)	15,176	D
Common Stock	09/21/2026		S(1)		2,200	D	$205.495(6)	12,976	D
Common Stock	09/21/2026		S(7)		1,366	D	$201.7(2)	1,185,552	I	By Childrens' Trust(8)
Common Stock	09/21/2026		S(7)		6,849	D	$202.6575(3)	1,178,703	I	By Childrens' Trust(8)
Common Stock	09/21/2026		S(7)		2,492	D	$203.4866(4)	1,176,211	I	By Childrens' Trust(8)
Common Stock	09/21/2026		S(7)		3,262	D	$204.7833(5)	1,172,949	I	By Childrens' Trust(8)
Common Stock	09/21/2026		S(7)		2,031	D	$205.495(6)	1,170,918	I	By Childrens' Trust(8)
Common Stock	09/21/2026		S(9)		854	D	$201.7(2)	451,546	I	By Foundation(10)
Common Stock	09/21/2026		S(9)		4,281	D	$202.6575(3)	447,265	I	By Foundation(10)
Common Stock	09/21/2026		S(9)		1,558	D	$203.4866(4)	445,707	I	By Foundation(10)
Common Stock	09/21/2026		S(9)		2,038	D	$204.7833(5)	443,669	I	By Foundation(10)
Common Stock	09/21/2026		S(9)		1,269	D	$205.495(6)	442,400	I	By Foundation(10)
Common Stock								692,104	I	By GRAT JD(11)
Common Stock								690,621	I	By GRAT KD(12)
Common Stock								81,927	I	by Trust(13)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Non-Qualified Stock Option (right to buy)	$14.1463	09/21/2026		M(1)			17,333	(14)	02/07/2029	Common Stock	17,333	$0.0	138,668	D

Explanation of Responses:

1. The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 11, 2026.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $201.09 to $202.08, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $202.10 to $203.08, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $203.11 to $203.99, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $204.20 to $205.18, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $205.20 to $205.95, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

7. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person for the benefit of the reporting person's children on March 11, 2026.

8. These shares are held in a trust for the benefit of a Child of the reporting person for which the reporting person serves as co-trustee. The reporting person shares voting and investment control over the shares but disclaims beneficial ownership of the shares.

9. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into on March 11, 2026 by the reporting person's 501(c) Foundation, for which the reporting person and his spouse serve as co-trustee.

10. These shares are held by a 501(c) Foundation for which the reporting person and his spouse serve as co-trustee.

11. Reporting person's spouse is the trustee of the Jennifer Duda Annuity Trusts.

12. Reporting person is the trustee of the Kenneth Duda Annuity Trusts.

13. These shares are held by a family trust for which the reporting person is co-trustee.

14. 1/48th of the shares subject to the option shall vest and become exercisable on December 1, 2020 and 1/48th of the shares subject to the option shall continue to vest each month thereafter.

	By: Isabelle Bertin-Bailly, Attorney-in-Fact For: Kenneth Duda	09/23/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)