William Abbey - 14 Sep 2026 Form 4 Insider Report for ARM HOLDINGS PLC /UK (ARM)

Reporting relationship: Chief Commercial Officer
Issuer ticker: ARM
Reported as of: 14 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 16 Sep 2026, 17:26:59 UTC
Prior SEC filing: 01 Jul 2026
Next SEC filing: 17 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ George Kanelos, as Attorney-in-Fact for William Abbey

Key filing fact

William Abbey filed Form 4 for ARM HOLDINGS PLC /UK (ARM) on 16 Sep 2026.

Key facts

This page summarizes William Abbey's Form 4 filing for ARM HOLDINGS PLC /UK (ARM).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 16 Sep 2026, 17:26.

Change

Previous filing in this sequence was filed on 01 Jul 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 0001945497 Primary reporting owner

Abbey William

Relationship: Chief Commercial Officer
Address: C/O ARM HOLDINGS PLC, 110 FULBOURN ROAD, CAMBRIDGE, UNITED KINGDOM
Signature: /s/ George Kanelos, as Attorney-in-Fact for William Abbey
Signature date: 16 Sep 2026

Reported derivative securities

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

ARM transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +17,288
Change %: +36%
Price: $0.000000^*
Shares after: 65,270
Date: 14 Sep 2026
Ownership: Direct
Underlying class: Ordinary Shares
Underlying amount: 17,288
Exercise price
Footnotes: F1, F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

Each restricted stock unit ("RSU") represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

Footnote F2

This RSU award was granted effective September 14, 2026. 50% will vest on each of August 15, 2028 and August 15, 2029, subject to continued service to Arm Holdings plc.

Footnote 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.