On July 19, 2021, the Board of Directors (the “Board”) of Arista Networks, Inc. (“Arista”) increased the size of the Board to nine members and appointed Lewis Chew to serve as an independent member of Arista’s Board effective immediately. Mr. Chew will serve as a Class III director with a term expiring at Arista’s 2023 annual meeting of stockholders. Mr. Chew was also appointed to the Audit Committee of the Board. Mr. Chew, 58, has served as Executive Vice President and Chief Financial Officer of Dolby Laboratories, Inc., an audio, voice and imaging technology company, since June 2012.