ARM Holdings CCO William Abbey's RSU Vesting and Share Transactions

This Form 4 filing discloses transactions by William Abbey, Chief Commercial Officer of ARM Holdings PLC, covering RSU vesting and share transactions. On May 15, 2026, Abbey received 23,310 ordinary shares through the vesting of performance-based RSUs from grants made in 2023, 2024, and 2025. Concurrently, 8,200 RSUs were forfeited. The filing also reports share sales totaling 10,154 shares between April 23-24 and May 15, 2026, at prices ranging from $199 to $212.76, with some sales executed under a 10b5-1 trading plan. Additionally, 15,317 shares were withheld to satisfy tax obligations on vested RSUs. The filing includes disclosure of delinquent transactions from April due to inadvertent oversight. Following these transactions, Abbey's direct holdings decreased from 79,711 to 57,394 ordinary shares.