Arm 4: DYKSTRA KAREN E bought 1,531 shares of Restricted Stock Uni… (May 19, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-15 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: ARM HOLDINGS PLC /UK (ARM) CIK: 0001973239 --- Reporting Owner --- Name: DYKSTRA KAREN E CIK: 0001198848 Role: Director --- Derivative Transactions --- [Transaction #1] Security: Restricted Stock Units Date: 2026-05-15 | Code: A (Grant or award) Shares: +1,531 | Price: $0.00 Shares Owned After: 5,802 | Ownership: D (Direct) Footnotes: [F1] Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS. [F2] The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc, but the ADSs will not be delivered until the date of termination of Ms. Dykstra's service on the Board of Directors pursuant to her election to defer such delivery. [F2] The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc, but the ADSs will not be delivered until the date of termination of Ms. Dykstra's service on the Board of Directors pursuant to her election to defer such delivery. [F3] Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share. --- Footnotes (Complete Index) --- F1: Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS. F2: The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc, but the ADSs will not be delivered until the date of termination of Ms. Dykstra's service on the Board of Directors pursuant to her election to defer such delivery. F3: Ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), are held in the form of American Depositary Shares ("ADSs"). Each ADS represents 1 Ordinary Share. --- Signature --- /s/ /s/ George Kanelos, as Attorney-in-Fact for Karen E. Dykstra (2026-05-19)