[Form 4] Arista Networks, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Arista Networks director Charles Giancarlo reported multiple sales of Arista common stock under a Rule 10b5-1 trading plan on 10/01/2025. The filings show repeated disposals at weighted-average prices ranging from about $143.75 up to $149.71 across several blocks; footnotes provide the specific price ranges for each block. The sales were executed pursuant to a 10b5-1 plan entered on June 12, 2025, and the shares sold are held in a family trust for which Mr. Giancarlo is a co-trustee. Following the reported transactions the amount of Arista common stock beneficially owned as shown in the form decreases through successive lines to 41,784 shares. The form is signed by an attorney-in-fact on behalf of Mr. Giancarlo on 10/03/2025.

Positive

• Sales executed under a Rule 10b5-1 plan, indicating prearranged trading (entered June 12, 2025)
• Full disclosure of weighted-average price ranges and willingness to provide per-price details on request

Negative

• Director disposed of multiple blocks of Arista stock on 10/01/2025, reducing beneficial ownership to 41,784 shares
• Large aggregate disposals reported (multiple weighted-average price ranges up to $149.71)

Insights

Corporate Governance Analyst

Insider sold multiple blocks under a prearranged 10b5-1 plan; holdings declined to 41,784 shares.

The Form 4 discloses that Director Charles Giancarlo executed several disposals on 10/01/2025 under a Rule 10b5-1 plan established on June 12, 2025. The filing provides weighted-average price ranges for each block sold, demonstrating the trades were carried out over multiple transactions.

This matters because 10b5-1 plans indicate preplanned sales rather than opportunistic trading; the filing also confirms the shares are held in a family trust where Mr. Giancarlo is a co-trustee, clarifying the nature of indirect ownership. The form is executed by an attorney-in-fact on 10/03/2025.

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^*

Giancarlo Charles H

(Last) (First) (Middle)

5453 GREAT AMERICA PARKWAY

(Street)

SANTA CLARA CA 95054

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025

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

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

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

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	10/01/2025		S(1)		1,200	D	$144.3372(2)	48,584	I	by Trust(3)
Common Stock	10/01/2025		S(1)		800	D	$145.3216(4)	47,784	I	by Trust(3)
Common Stock	10/01/2025		S(1)		800	D	$146.1913(5)	46,984	I	by Trust(3)
Common Stock	10/01/2025		S(1)		700	D	$147.2257(6)	46,284	I	by Trust(3)
Common Stock	10/01/2025		S(1)		2,350	D	$148.6826(7)	43,934	I	by Trust(3)
Common Stock	10/01/2025		S(1)		2,150	D	$149.3084(8)	41,784	I	by Trust(3)
Common Stock								220,607	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

Explanation of Responses:

1. This sale was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on June 12, 2025.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $143.75 to $144.69, 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. These shares are held by a family trust for which the reporting person is co-trustee.

4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $144.79 to $145.70, 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.

5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $145.81 to $146.76, 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 $146.88 to $147.71, 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 price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $147.98 to $148.92, 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.

8. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $148.98 to $149.71, 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.

	By: Isabelle Bertin-Bailly, Attorney-in-Fact For: Charles Giancarlo	10/03/2025
	** 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.

FAQ

What did Charles Giancarlo report on the Form 4 for ANET?

The Form 4 reports multiple sales of Arista common stock by Director Charles Giancarlo on 10/01/2025, executed under a Rule 10b5-1 plan.

How many Arista shares does Charles Giancarlo beneficially own after the reported trades?

The filing shows beneficial ownership declining through the reported transactions to 41,784 shares following the sales.

Were the trades prearranged under a 10b5-1 plan?

Yes. The sales were effected pursuant to a Rule 10b5-1 trading plan entered into on June 12, 2025.

What price ranges were the shares sold at?

Footnotes disclose weighted-average price ranges for each block, with trade prices reported between approximately $143.75 and $149.71 across the transactions.

Who signed the Form 4 on behalf of Mr. Giancarlo?

The Form 4 was signed by Isabelle Bertin-Bailly, Attorney-in-Fact for Charles Giancarlo on 10/03/2025.