Rene A. Haas - 09 Sep 2026 Form 4 Insider Report for ARM HOLDINGS PLC /UK (ARM)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: ARM
Reported as of: 09 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 10 Sep 2026, 16:22:37 UTC
Prior SEC filing: 19 May 2026
Source filing: View source filing
Reporting owner signature: /s/ George Kanelos, as Attorney-in-Fact for Rene A. Haas

Key filing fact

Rene A. Haas filed Form 4 for ARM HOLDINGS PLC /UK (ARM) on 10 Sep 2026.

Key facts

This page summarizes Rene A. Haas's Form 4 filing for ARM HOLDINGS PLC /UK (ARM).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 10 Sep 2026, 16:22.

Change

Previous filing in this sequence was filed on 19 May 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 0001998912 Primary reporting owner

Haas Rene A.

Relationship: Chief Executive Officer, Director
Address: C/O ARM HOLDINGS PLC, 110 FULBOURN ROAD, CAMBRIDGE, UNITED KINGDOM
Signature: /s/ George Kanelos, as Attorney-in-Fact for Rene A. Haas
Signature date: 10 Sep 2026

Reported non-derivative transactions

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

ARM transaction

Ordinary Shares

Award

Transaction value
Shares: +64
Change %: +0.02%
Price: $108.33^*
Shares after: 338,666
Date: 31 Aug 2026
Ownership: Direct
Footnotes: F1, F2, F3

ARM holding

Ordinary Shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 57,405
Date: 09 Sep 2026
Ownership: GRAT
Footnotes: F1, F3, F4

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: +425,000
Change %
Price: $0.000000^*
Shares after: 425,000
Date: 09 Sep 2026
Ownership: Direct
Underlying class: Ordinary Shares
Underlying amount: 425,000
Exercise price
Footnotes: F5, F6

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 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

Acquired under the Arm Holdings plc Employee Stock Purchase Plan on August 31, 2026.

Footnote F3

The number of shares held reflects the transfer, on September 9, 2026, of 57,405 Ordinary Shares from the Reporting Person to a grantor retained annuity trust, of which the Reporting Person serves as trustee.

Footnote F4

Grantor retained annuity trust is for the benefit of the Reporting Person.

Footnote F5

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

Footnote F6

This RSU award was granted in May 2026, subject to shareholder approval, which was obtained on September 9, 2026. This award has three tranches, each contingent on achieving market capitalization milestones: $1.0 trillion by March 31, 2029, $1.5 trillion by March 31, 2030, and $2.0 trillion by March 31, 2031. 25% of the VCP award is tied to each interim milestone, with the remaining 50% tied to the final milestone. If an interim milestone is not achieved within the specified timeframe, the associated portion will roll forward and remain eligible for vesting upon achievement of a subsequent milestone. Achievement of the milestones will be determined based on the rolling average closing price over any 60-day period prior to the relevant milestone date. If a milestone is achieved, vesting of the associated RSUs will occur on April 1, two years following the relevant milestone date, subject to continued employment.