Jason Child - 21 Sep 2026 Form 4 Insider Report for ARM HOLDINGS PLC /UK (ARM)

Reporting relationship: Chief Financial Officer
Issuer ticker: ARM
Reported as of: 21 Sep 2026
Net transaction value: -$3,120,000
SEC form: 4
Accepted by SEC: 23 Sep 2026, 17:06:06 UTC
Prior SEC filing: 31 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ George Kanelos, as Attorney-in-Fact for Jason Child

Key filing fact

Jason Child filed Form 4 for ARM HOLDINGS PLC /UK (ARM) on 23 Sep 2026.

Key facts

This page summarizes Jason Child's Form 4 filing for ARM HOLDINGS PLC /UK (ARM).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 23 Sep 2026, 17:06.

Change

Previous filing in this sequence was filed on 31 Aug 2026.
Current net transaction value: -$3,120,000.

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 0001533913 Primary reporting owner

Child Jason

Relationship: Chief Financial Officer
Address: C/O ARM HOLDINGS PLC, 110 FULBOURN ROAD, CAMBRIDGE, UNITED KINGDOM
Signature: /s/ George Kanelos, as Attorney-in-Fact for Jason Child
Signature date: 23 Sep 2026

Reported non-derivative transactions

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

ARM transaction

Ordinary Shares

Sale

Transaction value: $3,120,000
Shares: -10,400
Change %: -6.3%
Price: $300.00
Shares after: 153,442
Date: 21 Sep 2026
Ownership: Direct
Footnotes: F1, F2, F3

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

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 3 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

The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 22, 2026.

Footnote F3

Includes 10 ordinary shares acquired under the Arm Holdings plc 2024 Employee Stock Purchase Plan on August 31, 2026.