Arista Networks, Inc.

Securities Trading Plans of Directors and Executive Officers

During our last fiscal quarter, the following director and officers, as defined in Rule 16a-1(f), adopted a “Rule 10b5-1 trading arrangement” as defined in Regulation S-K Item 408, as follows:

On June 2, 2026, Chantelle Breithaupt, our Senior Vice President and Chief Financial Officer, modified her Rule 10b5-1 trading arrangement previously adopted on December 11, 2025, providing for the sale from time to time of a number of shares of our common stock that may be earned in connection with grants of performance-based restricted stock units, which cannot be determined at this time. The duration of the trading arrangement is until December 31, 2026, or earlier if all transactions under the trading arrangement are completed. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c).

On June 9, 2026, Mark Templeton, a member of our Board of Directors, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 50,000 shares of our common stock. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until June 30, 2027, or earlier if all transactions under the trading arrangement are completed.

No other officers or directors, as defined in Rule 16a-1(f), adopted orterminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement,” as defined in Regulation S-K Item 408, during the last fiscal quarter.