Sec Form 4 Filing - Duda Kenneth @ Arista Networks, Inc. - 2018-03-09

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

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Duda Kenneth 2. Issuer Name and Ticker or Trading Symbol Arista Networks, Inc. [ ANET] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) CTO and SVP Software Eng. (Last) (First) (Middle) 5453 GREAT AMERICA PARKWAY 3. Date of Earliest Transaction (MM/DD/YY) 03/09/2018 (Street) SANTA CLARA, CA95054 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 02/28/2018 G V 230 D $ 0 834 D Common Stock 02/28/2018 G V 230 A $ 0 470 I By Childrens' Trust ( 1 ) Common Stock 110,000 I By GRAT JD ( 2 ) Common Stock 110,000 I By GRAT KD ( 3 ) Common Stock 889,568 I by Trust ( 4 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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-3 $ 0 ( 5 ) 03/09/2018 A 6,000 ( 6 ) ( 6 ) Common Stock 6,000 $ 0 6,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Duda Kenneth 5453 GREAT AMERICA PARKWAY SANTA CLARA, CA95054 CTO and SVP Software Eng. Signatures By: Isabelle Bertin-Bailly, Attorney-in-Fact For: Kenneth Duda 03/13/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These shares are held in a trust for the benefit of the children of the reporting person for which the reporting person serves as trustee. The reporting person shares voting and investment control over the shares but disclaims beneficial ownership of the shares. ( 2 )Reporting persons spouse is the trustee of the Jennifer Duda 2017 Annuity Trust. ( 3 )Reporting person is the trustee of the Kenneth Duda 2017 Annuity Trust. ( 4 )These shares are held by a family trust for which the reporting person is a trustee. ( 5 )Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting. ( 6 )Six and one-quarter percent (6.25%) of the restricted stock units awarded will vest on May 20, 2019 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, and November 20 of each year.

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.
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