UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE

SECURITIES EXCHANGE ACT OF 1934

(AMENDMENT NO.    )

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☐	Preliminary Proxy Statement
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☐	Definitive Proxy Statement
☒	Definitive Additional Materials
☐	Soliciting Material Under §240.14a-12

ARISTA NETWORKS, INC.

(Name of Registrant as Specified In Its Charter)

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Your Vote Counts! ARISTA NETWORKS, INC. 2021 Annual Meeting Vote by May 31, 2021 11:59 PM ET ARISTA NETWORKS, INC. 5453 GREAT AMERICA PARKWAY SANTA CLARA, CA 95054 D50700-P51427 You invested in ARISTA NETWORKS, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on June 1, 2021. Get informed before you vote View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by making a request. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Please make a request by May 18, 2021 to facilitate timely delivery. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visit www.ProxyVote.com Control # Vote Virtually at the Meeting* June 1, 2021 11:00 AM PDT Smartphone users Point your camera here and vote without entering a control number Virtually at: www.virtualshareholdermeeting.com/ANET2021 *Please check the meeting materials for any special requirements for meeting attendance. V1

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Board Recommends Voting Items 1. Election of Directors Nominees: For 01) Kelly Battles 02) Andreas Bechtolsheim 03) Jayshree Ullal 2. Approval, on an advisory basis, of the compensation of the named executive officers. For 3. To ratify the appointment of Ernst & Young LLP as our independent registered public accounting firm for our fiscal year ending December 31, 2021. For NOTE: Such other business as may properly come before the meeting or any adjournment thereof. Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”. D50701-P51427