ARM Holdings Chief Legal Officer Spencer Collins Stock Transactions and RSU Vesting

This Form 4 filing reports multiple equity transactions by Spencer Collins, Chief Legal Officer of ARM Holdings PLC, on May 15, 2026. The filing details significant stock activity including the vesting of performance-based restricted stock units (RSUs) and subsequent tax withholding transactions. Collins received 10668 Ordinary Shares (in ADS form) from performance-based RSUs granted in 2025, 10071 shares from 2024 performance RSUs, and 48378 shares from 2023 performance RSUs. Additionally, he received 4184 and 3950 shares from time-based RSU vesting. The filing also shows a tax withholding transaction where 36310 shares were sold at $209.16 per share to cover tax obligations. Following these transactions, Collins holds 40941 Ordinary Shares directly and 138760 RSUs that will vest over future years subject to continued service.