Arista Networks director Templeton sells 5,000 shares

A director of Arista Networks, Inc. sold 5,000 common shares under a pre-arranged Rule 10b5-1 plan and reports 75,200 shares held indirectly in a spouse-trust.

Rhea-AI Filing Summary

Arista Networks, Inc. director Mark B. Templeton reported open‑market sales of 5,000 shares of common stock on September 8, 2026, in several tranches at weighted average prices around the high‑$190s per share. The sales were made under a Rule 10b5‑1 trading plan adopted on June 9, 2026. In addition, 75,200 shares of Arista stock are reported as held indirectly in a trust for which his spouse serves as trustee.

Insider Trade Summary 10b5-1

Net Seller: 5,000 shares

Net Sell 6 txns

Insider TEMPLETON MARK B

Role Director

Sold 5,000 shs ($986K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	1,300	$195.2692	$254K
Sale	Common Stock F1, F3	700	$196.1986	$137K
Sale	Common Stock F1, F4	1,000	$197.4598	$197K
Sale	Common Stock F1, F5	1,700	$198.4376	$337K
Sale	Common Stock F1, F6	300	$199.3167	$60K
holding	Common Stock F7	--	--	--

Holdings After Transaction: Common Stock — 53,410 shares (Direct); Common Stock — 75,200 shares (Indirect, by Spouse)

Footnotes (7)

1. F1. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on June 9, 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 $194.81 to $195.67, 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 $195.81 to $196.70, 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 $197.01 to $197.97, 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 $198.03 to $198.96, 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 $199.21 to $199.38, 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. These shares are held in a trust for which the reporting person's spouse serves as trustee.

Key Figures

Shares sold: 5,000 shares Weighted average sale price (tranche 1): $195.27 per share Weighted average sale price (tranche 2): $196.20 per share +4 more

7 metrics

Shares sold 5,000 shares Total Arista Networks common shares sold by Mark B. Templeton on September 8, 2026

Weighted average sale price (tranche 1) $195.27 per share Sale of 1,300 shares on September 8, 2026, with individual trades from $194.81 to $195.67

Weighted average sale price (tranche 2) $196.20 per share Sale of 700 shares on September 8, 2026, with individual trades from $195.81 to $196.70

Weighted average sale price (tranche 3) $197.46 per share Sale of 1,000 shares on September 8, 2026, with individual trades from $197.01 to $197.97

Weighted average sale price (tranche 4) $198.44 per share Sale of 1,700 shares on September 8, 2026, with individual trades from $198.03 to $198.96

Weighted average sale price (tranche 5) $199.32 per share Sale of 300 shares on September 8, 2026, with individual trades from $199.21 to $199.38

Indirectly held shares 75,200 shares Shares held in a trust for which the reporting person’s spouse serves as trustee

Key Terms

Rule 10b5-1 trading plan, weighted average price, trustee

3 terms

Rule 10b5-1 trading plan regulatory

"The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on June 9, 2026."

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.

trustee financial

"These shares are held in a trust for which the reporting person's spouse serves as trustee."

A trustee is a person or institution legally appointed to hold and manage assets or enforce an agreement on behalf of other people (beneficiaries). Think of a trustee as a neutral referee or custodian who must act in the beneficiaries’ best interests, follow the trust or contract rules, and handle distributions, recordkeeping and enforcement. Investors care because a trustworthy trustee protects their rights, ensures promised payments or remedies are delivered, and can influence recoveries if things go wrong.

FAQ

What insider transaction did Arista Networks (ANET) disclose for Mark B. Templeton?

Arista Networks disclosed that director Mark B. Templeton sold 5,000 shares of ANET common stock on September 8, 2026, through multiple open‑market transactions at weighted average prices in the high‑$190s per share, executed under a Rule 10b5‑1 trading plan.

At what prices did Mark B. Templeton sell ANET shares on September 8, 2026?

The reported weighted average prices per share were about $195.27, $196.20, $197.46, $198.44, and $199.32, with underlying individual trades occurring in ranges from $194.81 up to $199.38, as detailed in the footnotes describing the price intervals for each tranche.

Was the ANET insider sale by Mark B. Templeton made under a Rule 10b5-1 plan?

Yes. A footnote states that the sale of shares was effected pursuant to a Rule 10b5‑1 trading plan entered into by Mark B. Templeton on June 9, 2026, indicating the trades were pre‑arranged under that plan.

How many ANET shares are reported as indirectly held by Mark B. Templeton after the transactions?

The filing reports 75,200 shares of Arista Networks common stock held indirectly, described as being in a trust for which the reporting person’s spouse serves as trustee. These are reported as indirect holdings by spouse.

How many ANET shares did Mark B. Templeton sell in each trade on September 8, 2026?

On September 8, 2026, he sold 1,300 shares, 700 shares, 1,000 shares, 1,700 shares, and 300 shares of Arista Networks common stock in separate transactions, for a total of 5,000 shares sold that day.

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Available on EDGAR 09/10/2026 - 07:47 PM Accepted by SEC EDGAR 09/10/2026 - 07:47 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^*

TEMPLETON MARK B

(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)
09/08/2026

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	09/08/2026		S(1)		1,300	D	$195.2692(2)	57,110	D
Common Stock	09/08/2026		S(1)		700	D	$196.1986(3)	56,410	D
Common Stock	09/08/2026		S(1)		1,000	D	$197.4598(4)	55,410	D
Common Stock	09/08/2026		S(1)		1,700	D	$198.4376(5)	53,710	D
Common Stock	09/08/2026		S(1)		300	D	$199.3167(6)	53,410	D
Common Stock								75,200	I	by Spouse(7)

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

Explanation of Responses:

1. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on June 9, 2026.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $194.81 to $195.67, 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 $195.81 to $196.70, 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 $197.01 to $197.97, 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 $198.03 to $198.96, 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 $199.21 to $199.38, 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. These shares are held in a trust for which the reporting person's spouse serves as trustee.

	By: Isabelle Bertin-Bailly, Attorney-in-Fact For: Mark Templeton	09/10/2026
	** 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)