Laura Kathleen Bartels - 17 Aug 2026 Form 4 Insider Report for ARM HOLDINGS PLC /UK (ARM)

Reporting relationship: Chief Accounting Officer
Issuer ticker: ARM
Reported as of: 17 Aug 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 18 Aug 2026, 17:31:49 UTC
Prior SEC filing: 04 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ George Kanelos, as Attorney-in-Fact for Laura Kathleen Bartels

Key filing fact

Laura Kathleen Bartels filed Form 4 for ARM HOLDINGS PLC /UK (ARM) on 18 Aug 2026.

Key facts

This page summarizes Laura Kathleen Bartels's Form 4 filing for ARM HOLDINGS PLC /UK (ARM).
5 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 18 Aug 2026, 17:31.

Change

Previous filing in this sequence was filed on 04 Jun 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002114104 Primary reporting owner

Bartels Laura Kathleen

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

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ARM transaction

Ordinary Shares

Options Exercise

Transaction value
Shares: +862
Change %: +7.1%
Price
Shares after: 12,997
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1, F2, F3

ARM transaction

Ordinary Shares

Options Exercise

Transaction value
Shares: +819
Change %: +6.3%
Price
Shares after: 13,816
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1, F3, F4

ARM transaction

Ordinary Shares

Tax liability

Transaction value
Shares: -856
Change %: -6.2%
Price: $271.43^*
Shares after: 12,960
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1, F5

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ARM transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -862
Change %: -0.85%
Price: $0.000000^*
Shares after: 100,390
Date: 17 Aug 2026
Ownership: Direct
Underlying class: Ordinary Shares
Underlying amount: 862
Exercise price
Footnotes: F2, F3

ARM transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -819
Change %: -0.82%
Price: $0.000000^*
Shares after: 99,571
Date: 17 Aug 2026
Ownership: Direct
Underlying class: Ordinary Shares
Underlying amount: 819
Exercise price
Footnotes: F3, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote 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.

Footnote F2

This restricted stock unit ("RSU") award was granted on May 13, 2024, 28.5% of which vested on May 15, 2025, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

Footnote F3

Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

Footnote F4

This RSU award was granted on May 1, 2025, 28.5% of which vested on May 15, 2026, with quarterly vesting of 6.5% thereafter, subject to continued service to the Company.

Footnote F5

Ordinary Shares withheld to satisfy tax withholding requirements on vesting of RSUs.