144 0001605809 XXXXXXXX LIVE 0001596532 Arista Networks, Inc. 001-36468 5453 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 408-547-5500 Ullal Jayshree Officer Director Common Stock Fidelity Brokerage Services LLC

245 Summer Street Boston MA 02110

306139 51220717.14 1256537906 04/20/2026 NYSE Common Stock 09/22/2008 stock option exercise Issuer N 214299 09/22/2008 Wire Common Stock 12/31/2013 stock option exercise Issuer N 91840 12/31/2013 Wire N Jayshree Ullal C/O Arista Networks, Inc.

5453 GREAT AMERICA PARKWAY Santa Clara CA 95054

Common Stock 04/13/2026 112812 16934671.85 Jayshree Ullal C/O Arista Networks, Inc.

5453 GREAT AMERICA PARKWAY, Santa Clara CA 95054

Common Stock 04/16/2026 350000 55760635.00 45,920 sold from The Tarini Ullal Trust 45,920 sold from The Adeeti Ullal Trust 214,299 sold from 2000 Ullal Family Trust 04/20/2026 11/14/2025 Audrey Skillern, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Jayshree Ullal