Young Sohn - 15 May 2026 Form 4 Insider Report for ARM HOLDINGS PLC /UK (ARM)

Reporting relationship: Director
Issuer ticker: ARM
Reported as of: 15 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 19 May 2026, 16:53:48 UTC
Prior SEC filing: 11 May 2026
Source filing: View source filing
Reporting owner signature: /s/ George Kanelos, as Attorney-in-Fact for Young Sohn

Key filing fact

Young Sohn filed Form 4 for ARM HOLDINGS PLC /UK (ARM) on 19 May 2026.

Key facts

This page summarizes Young Sohn's Form 4 filing for ARM HOLDINGS PLC /UK (ARM).
4 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 19 May 2026, 16:53.

Change

Previous filing in this sequence was filed on 11 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 0001223726 Primary reporting owner

SOHN YOUNG

Relationship: Director
Address: C/O ARM HOLDINGS PLC, 110 FULBOURN ROAD, CAMBRIDGE, UNITED KINGDOM
Signature: /s/ George Kanelos, as Attorney-in-Fact for Young Sohn
Signature date: 19 May 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: +2,141
Change %: +313%
Price
Shares after: 2,825
Date: 15 May 2026
Ownership: Direct
Footnotes: F1, F2, F3

ARM transaction

Ordinary Shares

Tax liability

Transaction value
Shares: -429
Change %: -15%
Price: $209.16^*
Shares after: 2,396
Date: 15 May 2026
Ownership: Direct
Footnotes: F1, F4

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: -2,141
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 15 May 2026
Ownership: Direct
Underlying class: Ordinary Shares
Underlying amount: 2,141
Exercise price
Footnotes: F2, F3

ARM transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +1,531
Change %
Price: $0.000000^*
Shares after: 1,531
Date: 15 May 2026
Ownership: Direct
Underlying class: Ordinary Shares
Underlying amount: 1,531
Exercise price
Footnotes: F3, F5

^* 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

The restricted stock units ("RSUs") vested in full on May 15, 2026.

Footnote F3

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

Footnote F4

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

Footnote F5

The RSUs will vest in full on May 15, 2027, subject to continued service to Arm Holdings plc, but the ADSs will not be delivered until the date of termination of Mr. Sohn's service on the Board of Directors pursuant to his election to defer such delivery.