Form 4 Filing for ARM HOLDINGS PLC /UK

This filing details a Form 4 transaction for ARM HOLDINGS PLC /UK, specifically concerning Jason Child, the Chief Financial Officer. On September 21, 2026, Mr. Child disposed of 10,400 ordinary shares at a price of $300.0 per share, through a Rule 10b5-1 trading plan. Following this transaction, Mr. Child directly owns 153,442 ordinary shares. The filing also notes the acquisition of 10 ordinary shares under the Arm Holdings plc 2024 Employee Stock Purchase Plan on August 31, 2026, which are included in the post-transaction share count. Ordinary shares are held in the form of American Depositary Shares (ADSs), with each ADS representing one Ordinary Share.