Arista Networks Inc

Securities Trading Plans of Directors and Executive Officers

During our last fiscal quarter, the following directors and officer, 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 March 13, 2025, Kenneth Duda, our Chief Technology Officer, Senior Vice President, Software Engineering and Director, adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 680,000 shares of our common stock held in various trusts for the benefit of Mr. Duda’s family, for which Mr. Duda is the beneficial owner and which is intended to be treated as a single plan. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until June 18, 2026, 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.