Form 4 Filing for ARM HOLDINGS PLC /UK

Rene A. Haas, Chief Executive Officer of ARM HOLDINGS PLC /UK, reported a series of transactions on August 31, 2026, and September 9, 2026. On August 31, 2026, Haas acquired 64 ordinary shares under the Arm Holdings plc Employee Stock Purchase Plan at a price of $108.33 per share, increasing his direct holdings to 338,666 shares. Subsequently, on September 9, 2026, 57,405 ordinary shares were transferred from Haas to a grantor retained annuity trust (GRAT) for his benefit, where he serves as trustee. This transfer resulted in 57,405 shares held indirectly in the GRAT. Additionally, on September 9, 2026, Haas was granted 425,000 Restricted Stock Units (RSUs) with a transaction value of $0. Each RSU represents the right to receive one ordinary share upon vesting. The RSUs are contingent upon achieving market capitalization milestones of $1.0 trillion by March 31, 2029, $1.5 trillion by March 31, 2030, and $2.0 trillion by March 31, 2031. Vesting will occur two years after the milestone achievement, subject to continued employment.