X0609 4 2026-08-20 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 2026-08-20 4 M 0 13334 15.2769 A 26310 D Common Stock 2026-08-20 4 M 0 3999 14.1463 A 30309 D Common Stock 2026-08-20 4 S 0 4197 184.3297 D 26112 D Common Stock 2026-08-20 4 S 0 5750 185.1821 D 20362 D Common Stock 2026-08-20 4 S 0 6568 186.1257 D 13794 D Common Stock 2026-08-20 4 S 0 818 186.9698 D 12976 D Common Stock 2026-08-20 4 S 0 3875 184.3297 D 1027293 I By Childrens' Trust Common Stock 2026-08-20 4 S 0 5308 185.1821 D 1021985 I By Childrens' Trust Common Stock 2026-08-20 4 S 0 6063 186.1257 D 1015922 I By Childrens' Trust Common Stock 2026-08-20 4 S 0 754 186.9698 D 1015168 I By Childrens' Trust Common Stock 2026-08-20 4 S 0 2422 184.3297 D 459978 I By Foundation Common Stock 2026-08-20 4 S 0 3317 185.1821 D 456661 I By Foundation Common Stock 2026-08-20 4 S 0 3789 186.1257 D 452872 I By Foundation Common Stock 2026-08-20 4 S 0 472 186.9698 D 452400 I By Foundation Common Stock 2026-08-20 4 M 0 3880 0.0 A 110770 I by Trust Common Stock 2026-08-20 4 M 0 4148 0.0 A 114918 I by Trust Common Stock 2026-08-20 4 M 0 1832 0.0 A 116750 I by Trust Common Stock 2026-08-20 4 M 0 19816 0.0 A 136566 I by Trust Common Stock 2026-08-20 4 M 0 1350 0.0 A 137916 I by Trust Common Stock 2026-08-20 4 F 0 15541 186.45 D 122375 I by Trust Common Stock 757755 I By GRAT JD Common Stock 756272 I By GRAT KD Non-Qualified Stock Option (right to buy) 14.1463 2026-08-20 4 M 0 3999 0.0 D 2029-02-07 Common Stock 3999 156001 D Non-Qualified Stock Option (right to buy) 15.2769 2026-08-20 4 M 0 13334 0.0 D 2028-11-08 Common Stock 13334 0 D Restricted Stock Unit - 17 0.0 2026-08-20 4 M 0 1350 0.0 D Common Stock 1350 17550 D Restricted Stock Unit-11 0.0 2026-08-20 4 M 0 4148 0.0 D Common Stock 4148 20736 D Restricted Stock Unit-11 0.0 2026-08-20 4 M 0 4148 0.0 D Common Stock 4148 16588 D Restricted Stock Unit-13 0.0 2026-08-20 4 M 0 1832 0.0 D Common Stock 1832 16516 D Restricted Stock Unit-14 0.0 2026-08-20 4 M 0 19816 0.0 D Common Stock 19816 317056 D Restricted Stock Unit-8 0.0 2026-08-20 4 M 0 3880 0.0 D Common Stock 3880 3884 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 $183.72 to $184.7176, 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 $184.72 to $185.719, 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 $185.7311 to $186.7213, 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 $186.7331 to $187.16, 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. Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting. These shares are held by a family trust for which the reporting person is co-trustee. Represents shares withheld to satisfy tax withholding obligations on the vesting of restricted stock units. Reporting person's spouse is the trustee of the Jennifer Duda Annuity Trusts. Reporting person is the trustee of the Kenneth Duda Annuity Trusts. 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. 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. Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on February 20, 2026 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year. Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on on February 20, 2024 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year. Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on February 20, 2025 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year. Five percent (5%) of the restricted stock awarded vested on November 20, 2025 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year. Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on February 20, 2023 and will continue to vest at the same rate on each quarterly vest date thereafter. A quarterly vest date is the first market trading day on or after February 20, May 20, August 20, and November 20 of each year. By: Isabelle Bertin-Bailly, Attorney-in-Fact For: Kenneth Duda 2026-08-24