ARM Holdings Chief Architect Richard Grisenthwaite's Stock Transactions

ARM Holdings PLC Chief Architect Richard Roy Grisenthwaite filed a Form 4 reporting significant stock transactions on May 15-18, 2026. The filing shows the vesting of multiple performance-based restricted stock unit (RSU) awards granted in 2023, 2024, and 2025, resulting in the acquisition of 41,288 ordinary shares. Following vesting, 21,301 shares were withheld to satisfy tax obligations, and the remaining 24,339 shares were sold on May 18, 2026, at a weighted average price of $209.15 per share. The officer also received new RSU awards totaling 41,433 shares with future vesting schedules extending to 2029. After all transactions, Grisenthwaite holds 118,443 unvested RSUs but no direct shares. The transactions represent typical executive compensation activity including performance-based equity vesting, tax withholding, and subsequent sales.