X0306 4 2014-12-16 0 0001596532 Arista Networks, Inc. ANET 0001483484 BRANNON KELYN C/O ARISTA NETWORKS, INC. 5453 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 0 1 0 0 Chief Financial Officer Common Stock 2014-12-17 2014-12-17 4 M 0 20000 8.77 A 20000 D Common Stock 2014-12-17 2014-12-17 4 S 0 20000 67.9193 D 0 D Options to purchase common stock 8.77 2014-12-16 2014-12-16 4 A 0 20000 0 A 2017-12-01 2024-12-15 Common Stock 20000 20000 D Non-qualified stock option (right to buy) 8.77 2014-12-17 2014-12-17 4 M 0 20000 0 D 2014-07-08 2023-07-07 Common Stock 20000 235000 D These sales were effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on September 12, 2014. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.17 to $69.11, 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. 1/5th of the shares subject to the option shall vest one year after December 1, 2016, and 1/60th of the shares subject to the option shall vest each month thereafter provided that the reporting person continues to be a service provider to the Issuer as of each vest date. /s/ Marc Taxay Atty-in-Fact for Kelyn Brannon 2014-12-17