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

390 Madison Avenue 6th Floor New York NY 10017

10000 3591600 314152875 09/17/2024 NYSE Common 08/21/2023 RSU Issuer N 373 08/21/2023 NA Common 05/22/2023 RSU Issuer N 510 05/22/2023 NA Common 02/21/2023 RSU Issuer N 511 02/21/2023 NA Common 11/19/2023 RSU Issuer N 889 11/19/2023 NA Common 03/12/2024 Option Exercise Issuer N 7717 03/12/2024 NA N The Giancarlo Family Trust UAD 11/2/98

5453 Great America Parkway Santa Clara CA 95054

Common 07/01/2024 2000 705865.6 The Giancarlo Family Trust UAD 11/2/98

5453 Great America Parkway Santa Clara CA 95054

Common 08/01/2024 2000 684553.4 Shares were sold for The Giancarlo Family Trust UAD 11/2/98 - Charles Giancarlo as Trustee 09/17/2024 06/14/2024 /s/ JPMS LLC as agent and attorney-in-fact for Charles Giancarlo