X0306 4 2022-07-11 0 0001596532 Arista Networks, Inc. ANET 0001605808 Duda Kenneth 5453 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 0 1 0 0 CTO and SVP Software Eng. Common Stock 2022-07-11 4 M 0 20000 7.6675 A 23244 D Common Stock 2022-07-11 4 S 0 17000 102.1954 D 6244 D Common Stock 2022-07-11 4 S 0 3000 102.7842 D 3244 D Common Stock 2022-07-11 4 S 0 13600 102.1954 D 435708 I By Childrens' Trust Common Stock 2022-07-11 4 S 0 2400 102.7842 D 433308 I By Childrens' Trust Common Stock 2022-07-11 4 S 0 3000 102.1853 D 265600 I By Foundation Common Stock 2022-07-11 4 S 0 500 102.824 D 265100 I By Foundation Common Stock 354000 I By GRAT JD Common Stock 354000 I By GRAT KD Common Stock 28855 I by Trust Non-Qualified Stock Option (right to buy) 7.6675 2022-07-11 4 M 0 20000 0.0 D 2024-02-10 Common Stock 20000 340000 D The exercise and/or sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person on March 14, 2022. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $101.66 to $102.64, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $102.67 to $102.98, 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 in a trust for the benefit of a Child of the reporting person for which the reporting person serves as co-trustee. The reporting person shares voting and investment control over the shares but disclaims beneficial ownership of the shares. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into on December 13, 2021 by the reporting person's 501(c) Foundation, for which the reporting person and his spouse serve as co-trustee. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $101.70 to $102.68, 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 501(c) Foundation for which the reporting person and his spouse serve as co-trustee. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $102.76 to $102.95, 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. Reporting person's spouse is the trustee of the Jennifer Duda Annuity Trusts. Reporting person is the trustee of the Kenneth Duda Annuity Trusts. These shares are held by a family trust for which the reporting person is co-trustee. 1/5th of the shares subject to the option vested and become exercisable on December 1, 2018 and 1/60th of the shares subject to the option shall vest monthly thereafter. By: Isabelle Bertin-Bailly, Attorney-in-Fact For: Kenneth Duda 2022-07-13