Arista Networks President & CTO Kenneth Duda Executes Pre-Scheduled 10b5-1 Stock Transactions

Executive Summary

On September 21, 2026, Kenneth Duda, President, Chief Technology Officer, and Director of Arista Networks, Inc. ($ANET), completed a series of pre-planned equity transactions:

1. Option Exercise: Exercised 17,333 non-qualified stock options at $14.1463 per share (total cost ~$245,200).
2. Direct Sale: Disposed of all 17,333 newly exercised shares at weighted average prices between $201.70 and $205.495, yielding approximately $3.53 million in gross proceeds.
3. Indirect Sales:
   • Children's Trust: Sold 16,000 shares across multiple tranches for gross proceeds of approximately $3.26 million.
   • 501(c) Foundation: Sold 10,000 shares across multiple tranches for gross proceeds of approximately $2.03 million.

Combined, 43,333 shares were sold for total gross proceeds of approximately $8.82 million.

Plan Execution and Significance

• Rule 10b5-1 Trading Plans: All transactions were conducted in accordance with pre-arranged Rule 10b5-1 trading plans established on March 11, 2026.
• Remaining Holdings: Following these transactions, Kenneth Duda continues to retain substantial direct and indirect beneficial ownership, including 12,976 shares held directly, over 1.17 million shares in the Children's Trust, 442,400 shares in the Foundation, over 1.38 million shares across GRATs, and 81,927 shares in a family trust.
• Market Impact: Because the disposition was executed under structured 10b5-1 trading plans and represents a minor portion of the insider's aggregate holdings, this activity carries low trading significance.