ARM Holdings CEO Rene Haas Performance-Based RSU Vesting and Tax Withholding

This Form 4 filing reports transactions by ARM Holdings PLC CEO Rene A. Haas on May 15, 2026. The filing details the vesting of three separate performance-based restricted stock unit (RSU) grants totaling 265,643 ordinary shares (represented as ADSs). The RSUs were granted on May 1, 2025 (51,952 shares), May 13, 2024 (51,691 shares), and May 23, 2023 (162,000 shares), with all vesting occurring on May 15, 2026 following certification of performance conditions by the Remuneration Committee. Additionally, 143,316 shares were sold at $209.16 per share to satisfy tax withholding requirements on the vested RSUs. Following these transactions, Haas's ownership decreased from 539,323 shares to 396,007 shares. The transactions represent standard executive compensation activity involving performance-based equity awards and associated tax obligations.