SOFTBANK GROUP CORP. - 18 Mar 2026 Form 3 Insider Report for ARM HOLDINGS PLC /UK (ARM)

Reporting relationship: Director, 10%+ Owner
Issuer ticker: ARM
Reported as of: 18 Mar 2026
Net transaction value: $0
SEC form: 3
Accepted by SEC: 18 Mar 2026, 16:47:37 UTC
Prior SEC filing: 03 Feb 2026
Next SEC filing: 29 May 2026
Source filing: View source filing
Reporting owner signature: SoftBank Group Corp., By: /s/ Yuko Yamamoto, Head of Corporate Legal Department

Key filing fact

SOFTBANK GROUP CORP. filed Form 3 for ARM HOLDINGS PLC /UK (ARM) on 18 Mar 2026.

Key facts

This page summarizes SOFTBANK GROUP CORP.'s Form 3 filing for ARM HOLDINGS PLC /UK (ARM).
0 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 18 Mar 2026, 16:47.

Change

Previous filing in this sequence was filed on 03 Feb 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

Official SEC source

Ownership activity is grounded in SEC Form 3 disclosures.

View source filing

Reporting Owners (1)

CIK 0001065521 Primary reporting owner

SOFTBANK GROUP CORP.

Relationship: Director, 10%+ Owner
Address: 1-7-1 KAIGAN, MINATO-KU, TOKYO, JAPAN
Signature: SoftBank Group Corp., By: /s/ Yuko Yamamoto, Head of Corporate Legal Department
Signature date: 18 Mar 2026

Reported non-derivative transactions

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

ARM holding

Ordinary Shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 922,733,999
Date: 18 Mar 2026
Ownership: By limited liability company
Footnotes: F1, F2

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

The ordinary shares, nominal value 0.001 GBP per share ("Ordinary Shares"), of Arm Holdings plc (the "Company") may be represented by American Depositary Shares, each representing one Ordinary Share.

Footnote F2

Represents shares held of record by Kronos II LLC ("Kronos II"). Kronos II is an indirect wholly-owned subsidiary of SoftBank Group Corp. ("SoftBank Group"). Kronos II is a direct wholly-owned subsidiary of Kronos I (UK) Limited, which is in turn a direct wholly-owned subsidiary of Kronos Holdco (UK) Limited, which is in turn a direct wholly-owned subsidiary of SoftBank Group Capital ("SBGC"). SBGC is an indirect wholly-owned subsidiary of SoftBank Group, whose interests are held 46% by SoftBank Group and 54% by SoftBank Group Overseas GK, a direct wholly-owned subsidiary of SoftBank Group.

SEC remarks

Solely for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, SoftBank Group may be deemed a "director by deputization" by virtue of its director appointment rights pursuant to that certain Shareholder Governance Agreement, dated September 19, 2023, by and between SoftBank Group and the Company.