X0306 4 2022-11-22 0 0001596532 Arista Networks, Inc. ANET 0001701967 McCool John F 5453 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 0 1 0 0 Chief Platform Officer Common Stock 2022-11-22 4 S 0 2400 135.0006 D 1014 I by Trust Common Stock 2022-11-22 4 S 0 682 136.0482 D 332 I by Trust The exercise and/or sales reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 10, 2021. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $134.61 to $135.54, 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 is co-trustee. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $135.89 to $136.19, 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. By: Isabelle Bertin-Bailly, Attorney-in-Fact For: John F. McCool 2022-11-25