X0306 4 2015-04-29 0 0001596532 Arista Networks, Inc. ANET 0001546946 Smith Mark Stephen C/O ARISTA NETWORKS, INC. 5453 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 0 1 0 0 SVP Worldwide Sales Common Stock 2015-04-29 2015-04-29 4 S 0 1150 65.247 D 142841 I By Trust The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on December 8, 2014. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.73 to $65.80, 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. These shares are held by a family trust for which the reporting person serves as trustee. Marc Taxay Atty-in-Fact for Mark Smith 2015-04-30