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 270 Park Avenue - 10th Floor New York NY 10017 69332 12108140 1259202593 06/22/2026 NYSE Common 06/22/2026 Stock Option Exercise Issuer N 69332 06/22/2026 Cash N Kenneth Duda C/O Issuer 5453 Great America Parkway Santa Clara CA 95054 Common 04/17/2026 32000 5225978 Kenneth Duda C/O Issuer 5453 Great America Parkway Santa Clara CA 95054 Common 05/18/2026 32000 4482710 Molly Hsu-Mei Duda 2017 Trust C/O Issuer 5453 Great America Parkway Santa Clara CA 95054 Common 04/17/2026 8000 1306494 Molly Hsu-Mei Duda 2017 Trust C/O Issuer 5453 Great America Parkway Santa Clara CA 95054 Common 05/18/2026 8000 1120678 Sophie Hsu-Tsen Duda 2017 Trust C/O Issuer 5453 Great America Parkway Santa Clara CA 95054 Common 04/17/2026 8000 1306494 Sophie Hsu-Tsen Duda 2017 Trust C/O Issuer 5453 Great America Parkway Santa Clara CA 95054 Common 05/18/2026 8000 1120678 Foundation for Truth, Justice, and Compassion C/O Issuer 5453 Great America Parkway Santa Clara CA 95054 Common 04/17/2026 10000 1633118 Foundation for Truth, Justice, and Compassion C/O Issuer 5453 Great America Parkway Santa Clara CA 95054 Common 05/18/2026 10000 1400847 The sales under this filing are from Cashless Option Exercises that will occur within 3 months from the date of this filing. 06/22/2026 03/11/2026 /s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for Kenneth Duda