Sec Form 4 Filing - BECHTOLSHEIM ANDREAS @ Arista Networks, Inc. - 2018-09-04

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 BECHTOLSHEIM ANDREAS 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 X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Development Officer (Last) (First) (Middle) 5453 GREAT AMERICA PARKWAY 3. Date of Earliest Transaction (MM/DD/YY) 09/04/2018 (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 09/04/2018 M 333 A $ 22.49 3,810 D Common Stock 09/04/2018 M 8,334 A $ 38 12,144 D Common Stock 09/04/2018 M 939 A $ 68.34 13,083 D Common Stock 09/04/2018 S 13,083 D $ 290.0585 ( 1 ) 0 D Common Stock 12,663,121 I by Trust ( 2 )

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 an d 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 Non-Qualified Stock Option (right to buy) $ 22.49 09/04/2018 M 333 ( 3 ) 01/12/2024 Common Stock 333 $ 0 13,000 D Non-Qualified Stock Option (right to buy) $ 38 09/04/2018 M 8,334 ( 4 ) 05/19/2024 Common Stock 8,334 $ 0 308,333 D Non-Qualified Stock Option (right to buy) $ 68.34 09/04/2018 M 939 ( 5 ) 12/15/2024 Common Stock 939 $ 0 17,728 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other BECHTOLSHEIM ANDREAS 5453 GREAT AMERICA PARKWAY SANTA CLARA, CA95054 X X Chief Development Officer Signatures By: Isabelle Bertin-Bailly, Attorney-in-Fact For: Andreas Bechtolsheim 09/05/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $290.00 to $290.30, 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. ( 2 )These shares are beneficially owned by The Bechtolsheim Family Trust for which Mr. Bechtolsheim is a Trustee ( 3 )1/5th of the 20,000 shares subject to the option vested and became exercisable on December 1, 2017 and 1/60th of the shares subject to the option shall vest monthly thereafter. ( 4 )1/5th of the 500,000 shares subject to the option vested on September 30, 2017 and 1/60th of the shares subject to the option shall vest monthly thereafter. ( 5 )1/5th of the 70,000 shares subject to the option vested on December 1, 2015 and 1/60th of the shares subject to the option shall continue to vest each month thereafter.

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).

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