X0609 4 2026-10-20 0 0001596532 Arista Networks, Inc. ANET 0001605808 Duda Kenneth false 5453 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 1 1 0 0 President and CTO 1 Common Stock 2026-10-20 4 M 0 17333 14.1463 A 30309 D Common Stock 2026-10-20 4 S 0 649 177.9108 D 29660 D Common Stock 2026-10-20 4 S 0 486 179.0184 D 29174 D Common Stock 2026-10-20 4 S 0 3538 180.1198 D 25636 D Common Stock 2026-10-20 4 S 0 6487 180.9298 D 19149 D Common Stock 2026-10-20 4 S 0 5973 181.7814 D 13176 D Common Stock 2026-10-20 4 S 0 200 182.7925 D 12976 D Common Stock 2026-10-20 4 S 0 599 177.9108 D 1170319 I By Childrens' Trust Common Stock 2026-10-20 4 S 0 449 179.0184 D 1169870 I By Childrens' Trust Common Stock 2026-10-20 4 S 0 3265 180.1198 D 1166605 I By Childrens' Trust Common Stock 2026-10-20 4 S 0 5988 180.9298 D 1160617 I By Childrens' Trust Common Stock 2026-10-20 4 S 0 5514 181.7814 D 1155103 I By Childrens' Trust Common Stock 2026-10-20 4 S 0 185 182.7925 D 1154918 I By Childrens' Trust Common Stock 2026-10-20 4 S 0 374 177.9108 D 442026 I By Foundation Common Stock 2026-10-20 4 S 0 281 179.0184 D 441745 I By Foundation Common Stock 2026-10-20 4 S 0 2041 180.1198 D 439704 I By Foundation Common Stock 2026-10-20 4 S 0 3742 180.9298 D 435962 I By Foundation Common Stock 2026-10-20 4 S 0 3446 181.7814 D 432516 I By Foundation Common Stock 2026-10-20 4 S 0 116 182.7925 D 432400 I By Foundation Common Stock 692104 I By GRAT JD Common Stock 690621 I By GRAT KD Common Stock 81927 I by Trust Non-Qualified Stock Option (right to buy) 14.1463 2026-10-20 4 M 0 17333 0.0 D 2029-02-07 Common Stock 17333 121335 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 11, 2026. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $177.45 to $178.32, 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 $178.45 to $179.38, 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 $179.45 to $180.43, 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 $180.46 to $181.45, 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 $181.46 to $182.28, 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 $182.70 to $183.11, 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. The sale of shares was effected pursuant to a Rule 10b5-1 trading plan entered into by the reporting person for the benefit of the reporting person's children on March 11, 2026. 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 March 11, 2026 by the reporting person's 501(c) Foundation, for which the reporting person and his spouse serve as co-trustee. These shares are held by a 501(c) Foundation for which the reporting person and his spouse serve as co-trustee. 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. 1/48th of the shares subject to the option shall vest and become exercisable on December 1, 2020 and 1/48th of the shares subject to the option shall continue to vest each month thereafter. By: Isabelle Bertin-Bailly, Attorney-in-Fact For: Kenneth Duda 2026-10-22