144 0001605808 XXXXXXXX LIVE 0001596532 Arista Networks, Inc. 001-36468 5453 Great America Parkway Santa Clara CA 95054 408-547-5500 Kenneth Duda Officer Common J.P. Morgan Securities LLC

360 Madison Avenue - 6th Floor New York NY 10017

32000 2892160 1261122596 05/06/2025 NYSE Common 09/13/2023 Grantor Annuity Trust distribution Kenneth and Jennifer Duda N 32000 08/20/2021 NA N Kenneth Duda

C/O Issuer 5453 Great America Parkway Santa Clara CA 95054

Common 03/06/2025 80000 6788040 Kenneth Duda

C/O Issuer 5453 Great America Parkway Santa Clara CA 95054

Common 04/07/2025 80000 5342981 Molly Hsu-Mei Duda 2017 Trust

C/O Issuer 5453 Great America Parkway Santa Clara CA 95054

Common 03/06/2025 32000 2715216 Molly Hsu-Mei Duda 2017 Trust

C/O Issuer 5453 Great America Parkway Santa Clara CA 95054

Common 04/07/2025 32000 2137193 Sophie Hsu-Tsen Duda 2017 Trust

C/O Issuer 5453 Great America Parkway Santa Clara CA 95054

Common 03/06/2025 32000 2715216 Sophie Hsu-Tsen Duda 2017 Trust

C/O Issuer 5453 Great America Parkway Santa Clara CA 95054

Common 04/07/2025 32000 2137193 Foundation for Truth, Justice, and Compassion

C/O Issuer 5453 Great America Parkway Santa Clara CA 95054

Common 03/06/2025 16000 1357608 Foundation for Truth, Justice, and Compassion

C/O Issuer 5453 Great America Parkway Santa Clara CA 95054

Common 04/07/2025 16000 1068596 The shares filed for today will be sold by Molly Hsu-Mei Duda 2017 Trust - Kenneth Duda as Trustee. This filing is for Restricted Stock Units acquired by Kenneth Duda between November 30, 2010 and August 20, 2021. 05/06/2025 03/14/2024 /s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for Kenneth Duda