X0306 4 2022-08-22 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 2022-08-22 4 M 0 1000 0.0 A 1332 I by Trust Common Stock 2022-08-22 4 M 0 748 0.0 A 2080 I by Trust Common Stock 2022-08-22 4 M 0 1248 0.0 A 3328 I by Trust Common Stock 2022-08-22 4 M 0 1456 0.0 A 4784 I by Trust Common Stock 2022-08-22 4 M 0 732 0.0 A 5516 I by Trust Common Stock 2022-08-22 4 M 0 442 0.0 A 5958 I by Trust Common Stock 2022-08-22 4 M 0 496 0.0 A 6454 I by Trust Common Stock 2022-08-22 4 F 0 3037 127.14 D 3417 I by Trust Restricted Stock Unit-2 0.0 2022-08-22 4 M 0 1000 0.0 D Common Stock 1000 2000 D Restricted Stock Unit-3 0.0 2022-08-22 4 M 0 748 0.0 D Common Stock 748 6000 D Restricted Stock Unit-4 0.0 2022-08-22 4 M 0 1248 0.0 D Common Stock 1248 10000 D Restricted Stock Unit-5 0.0 2022-08-22 4 M 0 1456 0.0 D Common Stock 1456 14548 D Restricted Stock Unit-6 0.0 2022-08-22 4 M 0 732 0.0 D Common Stock 732 9556 D Restricted Stock Unit-8 0.0 2022-08-22 4 M 0 442 0.0 D Common Stock 442 2627 D Restricted Stock Unit-9 0.0 2022-08-22 4 M 0 496 0.0 D Common Stock 496 2944 D Each restricted stock unit represents a contingent right to receive one share of Arista Networks, Inc. Common Stock upon vesting. Includes 166 shares acquired under the Arista Networks, Inc. 2014 Employee Stock Purchase Plan on August 15, 2022. 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. Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on May 20, 2019 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, or November 20 of each year. Six and one-quarter percent (6.25%) of the restricted stock units awarded vested on November 20, 2020 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 November 20, 2020 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 May 20, 2021 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 will vest on February 20, 2022 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. This performance stock award was granted in the first quarter of 2021 and was earned based on attainment of certain performance conditions. The award vests 1/3 on February 22, 2022, and will continue to vest quarterly over 2 years. 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. This performance stock award was granted in the first quarter of 2021 and was earned based on attainment of certain performance conditions. The award vests 1/3 on February 22, 2022, and will continue to vest quarterly over 2 years. 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: John F. McCool 2022-08-24