144 0001299634 XXXXXXXX LIVE 0001596532 ARISTA NETWORKS, INC. 001-36468 5453 Great America Parkway Santa Clara CA 95054 4085475500 Charles Giancarlo Director Common J.P. Morgan Securities LLC 270 Park Avenue 10th Floor New York NY 10017 24000 4145040 1256537906 05/01/2026 NYSE Common 03/12/2014 Stock Option Exercise Charlie Giancarlo N 24000 03/12/2014 N/A N The Giancarlo Family Trust UAD 11/02/98 5453 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 Common 02/02/2026 8000 1123469 The Giancarlo Family Trust UAD 11/02/98 5453 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 Common 03/01/2026 8000 1029372 The Giancarlo Family Trust UAD 11/02/98 5453 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 Common 04/01/2026 8000 1007603 Shares in this filing will be sold for The Giancarlo Family Trust UAD 11/2/98 - Charles Giancarlo as Trustee. 05/01/2026 06/12/2025 /s/ JPMS LLC as agent and attorney-in-fact for Charles Giancarlo