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

1099495 221239724.20 1261224648 08/05/2026 NYSE Common Stock 09/22/2008 Stock Options exercise Issuer N 767029 09/22/2008 Wire Common Stock 12/31/2013 Stock Options exercise Issuer N 932466 12/31/2013 Wire N Jayshree Ullal C/O Arista Networks, Inc.

5453 GREAT AMERICA PARKWAY, Santa Clara CA 95054

Common Stock 05/26/2026 13809 2141003.98 Jayshree Ullal C/O Arista Networks, Inc.

5453 GREAT AMERICA PARKWAY Santa Clara CA 95054

Common Stock 07/09/2026 242422 45616262.39 Jayshree Ullal C/O Arista Networks, Inc.

5453 GREAT AMERICA PARKWAY, Santa Clara CA 95054

Common Stock 07/10/2026 234578 43907277.00 165,717 Sold from the Tarini Ullal Trust 165,717 sold from the Adeeti Ullal Trust 767,029 sold from the 2000 Ullal Family Trust 516 sold from the The Ishan Nagpal Trust 516 sold from the The Shriya Nagpal Trust 08/05/2026 11/14/2025 Audrey Skillern, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Jayshree Ullal