Laura Kathleen Bartels - 18 Mar 2026 Form 3 Insider Report for ARM HOLDINGS PLC /UK (ARM)

Role
Chief Accounting Officer
Signature
/s/ George Kanelos, as Attorney-in-Fact for Laura Kathleen Bartels
Issuer symbol
ARM
Transactions as of
18 Mar 2026
Net transactions value
$0
Form type
3
Filing time
18 Mar 2026, 17:13:57 UTC
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Bartels Laura Kathleen Chief Accounting Officer C/O ARM HOLDINGS PLC, 110 FULBOURN ROAD, CAMBRIDGE, UNITED KINGDOM /s/ George Kanelos, as Attorney-in-Fact for Laura Kathleen Bartels 18 Mar 2026 0002114104

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding ARM Ordinary Shares 20,066 18 Mar 2026 Direct F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding ARM Restricted Stock Units 18 Mar 2026 Ordinary Shares 12,592 Direct F1, F2, F3
holding ARM Restricted Stock Units 18 Mar 2026 Ordinary Shares 6,895 Direct F1, F3, F4
holding ARM Restricted Stock Units 18 Mar 2026 Ordinary Shares 2,308 Direct F1, F3, F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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 This restricted stock unit ("RSU") award was granted on May 1, 2025, 28.5% of which will vest on May 15, 2026, with quarterly vesting of 6.5% thereafter with 100% of the award fully vested on February 15, 2029.
F3 Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.
F4 This RSU award was granted on May 13, 2024, 28.5% of which vested on May 15, 2025, with quarterly vesting of 6.5% thereafter with 100% of the award fully vested on February 15, 2028. The number in the table represents the total remaining unvested RSUs as of March 18, 2025.
F5 This RSU award was granted on May 22, 2023, 28.5% of which vested on May 15, 2024, with quarterly vesting of 6.5% thereafter with 100% of the award fully vested on May 15, 2026. The number in the table represents the total remaining unvested RSUs as of March 18, 2025.

Remarks:

Exhibit 24 - Power of Attorney