ARM HOLDINGS PLC /UK (ARM) · Insider Trading (Form 4) SEC Filing

=== 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: Schooler Rosemary CIK: 0001763187 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Ordinary Shares Date: 2026-05-15 | Code: M (Exercise of derivative) Shares: +2,141 Shares Owned After: 9,572 | Ownership: D (Direct) Footnotes: [F1] 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. [F2] The restricted stock units ("RSUs") vested in full on May 15, 2026. [F3] Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS. --- Derivative Transactions --- [Transaction #1] Security: Restricted Stock Units Date: 2026-05-15 | Code: M (Exercise of derivative) Shares: -2,141 | Price: $0.00 Shares Owned After: 0 | Ownership: D (Direct) Footnotes: [F3] Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS. [F2] The restricted stock units ("RSUs") vested in full on May 15, 2026. [F2] The restricted stock units ("RSUs") vested in full on May 15, 2026. [Transaction #2] Security: Restricted Stock Units Date: 2026-05-15 | Code: A (Grant or award) Shares: +1,531 | Price: $0.00 Shares Owned After: 1,531 | Ownership: D (Direct) Footnotes: [F3] Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS. [F4] 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. Schooler's service on the Board of Directors pursuant to her election to defer such delivery. [F4] 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. Schooler's service on the Board of Directors pursuant to her election to defer such delivery. --- Footnotes (Complete Index) --- F1: 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. F2: The restricted stock units ("RSUs") vested in full on May 15, 2026. F3: Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS. F4: 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. Schooler's service on the Board of Directors pursuant to her election to defer such delivery. --- Signature --- /s/ /s/ George Kanelos, as Attorney-in-Fact for Rosemary Schooler (2026-05-19)