X0306 4 2015-03-04 0 0001596532 Arista Networks, Inc. ANET 0001605809 Ullal Jayshree C/O ARISTA NETWORKS, INC. 5453 GREAT AMERICA PARKWAY SANTA CLARA CA 95054 1 1 1 0 President and CEO Common Stock 2015-03-04 2015-03-04 4 S 0 2500 69.0209 D 1497500 I By trust for child #1 Common Stock 2015-03-04 2015-03-04 4 S 0 2500 69.0209 D 1497500 I By Trust for child #2 Common Stock 2015-03-05 2015-03-05 4 S 0 9400 69 D 1488100 I By trust for child #1 Common Stock 2015-03-05 2015-03-05 4 S 0 9400 69 D 1488100 I By Trust for child #2 Common Stock 4048279 I By Family Trust Common Stock 98810 I By Trust for niece Common Stock 98810 I By Trust for nephew Common Stock 200000 I By Foundation The sale reported on this Form 4 was made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 12, 2014. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.00 to $69.1025, inclusive. The reporting person undertakes to provide Arista Networks, Inc., any security holder of Arista Networks, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. These shares are held in a trust for the benefit of a child of the reporting person for the reporting person serves as co-trustee. The reporting person shares voting and investment control over the shares but disclaims beneficial ownership of the shares. These shares are held of record by the 2000 Ullal Family Trust of which the reporting person is a co-trustee. These shares are held in a trust for the benefit of a relative of the reporting person for which the reporting person serves as co-trustee. The reporting person shares voting and investment control over the shares but disclaims beneficial ownership of the shares. These shares are held by a 501(c)(3) Foundation for which the reporting person and her husband serve as corporate officers. The reporting person shares voting and investment control over the shares with her husband, but disclaims beneficial ownership of the shares. /s/Marc Taxay Atty-in-Fact for Jayshree Ullal 2015-03-06