Rosemary Schooler - 18 Mar 2026 Form 3 Insider Report for ARM HOLDINGS PLC /UK (ARM)

Role
Director
Signature
/s/ George Kanelos, as Attorney-in-Fact for Rosemary Schooler
Issuer symbol
ARM
Transactions as of
18 Mar 2026
Net transactions value
$0
Form type
3
Filing time
18 Mar 2026, 17:02:15 UTC
Previous filing
10 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Schooler Rosemary Director C/O ARM HOLDINGS PLC, 110 FULBOURN ROAD, CAMBRIDGE, UNITED KINGDOM /s/ George Kanelos, as Attorney-in-Fact for Rosemary Schooler 18 Mar 2026 0001763187

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
holding ARM Ordinary Shares 7,431 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 2,141 Direct F1, F2, F3
* 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 The restricted stock units ("RSUs") will vest in full on May 15, 2026, subject to continued service to Arm Holdings plc.
F3 Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

Remarks:

Exhibit 24 - Power of Attorney