Arista director sells shares after RSU vesting

Arista Networks director Yvonne Wassenaar reported an RSU vesting and related share sales.

Rhea-AI Filing Summary

Arista Networks director Yvonne Wassenaar reported an RSU vesting and related share sales. On May 20, 2026, she exercised 971 restricted stock units into 971 shares of Arista Networks, Inc. Common Stock. The same day, she sold 971 shares in four open-market transactions at weighted average prices reported between $139.8920 and $142.6189 per share.

The filing states these exercises and sales were made under a pre-arranged Rule 10b5-1 trading plan adopted on November 21, 2025. Following the transactions, Wassenaar directly holds 9,784 shares of Arista Networks common stock, indicating a routine liquidity event rather than a change in her overall equity stake.

Insider Trade Summary 10b5-1

Exercise and Sale: 971 shares ($137K approx. pre-tax spread)

Exercise and Sale 6 txns

Insider Wassenaar Yvonne

Role Director

Sold 971 shs ($137K)

Approx. gross sale proceeds $137K

Approx. exercise cost $0.00

Approx. pre-tax spread $137K

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit-4	971	$0.00	$0.00
Exercise	Common Stock	971	$0.00	$0.00
Sale	Common Stock	324	$139.892	$45K
Sale	Common Stock	329	$140.8642	$46K
Sale	Common Stock	242	$141.8928	$34K
Sale	Common Stock	76	$142.6189	$11K

Holdings After Transaction: Restricted Stock Unit-4 — 0 contracts (Direct); Common Stock — 9,784 shares (Direct)

Footnotes (7)

1. F1. Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.
2. F2. The exercises and/or sales reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 21, 2025.
3. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $139.36 to $140.35, 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 $140.36 to $141.35, 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 $141.36 to $142.35, 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 $142.37 to $143.20, 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 reporting person was granted RSUs on May 30, 2025. 1/4th of the shares vest on August 20, 2025 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, or November 20.

Key Figures

Shares sold: 971 shares RSUs exercised: 971 units Sale prices: $139.8920–$142.6189/share +2 more

5 metrics

Shares sold 971 shares Total common shares sold in open-market transactions on May 20, 2026

RSUs exercised 971 units Restricted stock units converted into common stock on May 20, 2026

Sale prices $139.8920–$142.6189/share Weighted average prices reported across four sale tranches

Post-transaction holdings 9,784 shares Common stock held directly by Yvonne Wassenaar after transactions

Single sale tranche 329 shares at $140.8642/share One of four reported open-market sale lines on May 20, 2026

Key Terms

Rule 10b5-1 trading plan, restricted stock unit, weighted average price, quarterly vest date

4 terms

Rule 10b5-1 trading plan financial

"The exercises and/or sales reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 21, 2025."

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.

restricted stock unit financial

"Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting."

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

weighted average price financial

"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $139.36 to $140.35, inclusive."

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.

quarterly vest date financial

"A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, or November 20."

FAQ

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

What did Arista Networks (ANET) director Yvonne Wassenaar report on this Form 4?

Director Yvonne Wassenaar reported an RSU vesting and related share sales. She converted 971 restricted stock units into 971 common shares, then sold those 971 shares in multiple open-market transactions on May 20, 2026, at disclosed weighted average prices.

How many Arista Networks (ANET) shares did Yvonne Wassenaar sell and at what prices?

Yvonne Wassenaar sold 971 Arista Networks common shares in four open-market trades. The filing shows weighted average sale prices ranging from $139.8920 to $142.6189 per share, with additional footnotes describing detailed price ranges for the individual underlying transactions.

How many Arista Networks (ANET) shares does Yvonne Wassenaar hold after these transactions?

After the reported transactions, Yvonne Wassenaar directly holds 9,784 shares of Arista Networks common stock. This balance reflects her position following the RSU exercise of 971 shares and the same-day open-market sale of 971 shares disclosed in the Form 4.

Were Yvonne Wassenaar’s Arista Networks (ANET) share sales under a Rule 10b5-1 plan?

Yes. A footnote explains that the exercises and/or sales reported were made pursuant to a Rule 10b5-1 trading plan adopted on November 21, 2025. Such plans pre-schedule trades, indicating the timing was arranged in advance rather than decided opportunistically.

What are the restricted stock units mentioned in Yvonne Wassenaar’s Arista Networks (ANET) filing?

The filing describes each restricted stock unit as a contingent right to receive one share of Arista Networks common stock upon vesting. RSUs were granted on May 30, 2025, with one-quarter vesting on August 20, 2025 and additional portions vesting on specified quarterly trading dates.

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

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Accepted by SEC EDGAR 05/22/2026 - 06:47 PM EDT 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^*

Wassenaar Yvonne

(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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/20/2026

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	05/20/2026		M		971	A	$0.0(1)	10,755	D
Common Stock	05/20/2026		S(2)		324	D	$139.892(3)	10,431	D
Common Stock	05/20/2026		S(2)		329	D	$140.8642(4)	10,102	D
Common Stock	05/20/2026		S(2)		242	D	$141.8928(5)	9,860	D
Common Stock	05/20/2026		S(2)		76	D	$142.6189(6)	9,784	D

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
Restricted Stock Unit-4	$0.0(1)	05/20/2026		M			971	(7)	(7)	Common Stock	971	$0.0	0	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting.

2. The exercises and/or sales reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 21, 2025.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $139.36 to $140.35, 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 $140.36 to $141.35, 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 $141.36 to $142.35, 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 $142.37 to $143.20, 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 reporting person was granted RSUs on May 30, 2025. 1/4th of the shares vest on August 20, 2025 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, or November 20.

	By: Isabelle Bertin-Bailly, Attorney-in-Fact For: Yvonne Wassenaar	05/22/2026
	** 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)