# EDGAR Filing Document

**Accession Number:** 0001065521
**File Stem:** 0001973239-26-000019
**Filing Date:** 2026-3
**Character Count:** 5860
**Document Hash:** 373efc51d19fcbe01af552d76350ec3a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001973239-26-000019.hdr.sgml**: 20260415

**ACCESSION NUMBER**: 0001973239-26-000019

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260318

**FILED AS OF DATE**: 20260318

**DATE AS OF CHANGE**: 20260318

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** SOFTBANK GROUP CORP.
- **CENTRAL INDEX KEY:** 0001065521

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41800
- **FILM NUMBER:** 26769999

**BUSINESS ADDRESS:**
- **STREET 1:** 1-7-1 KAIGAN
- **STREET 2:** MINATO-KU
- **CITY:** TOKYO
- **STATE:** M0
- **ZIP:** 105-7537
- **BUSINESS PHONE:** 01181368892260

**MAIL ADDRESS:**
- **STREET 1:** 1-7-1 KAIGAN
- **STREET 2:** MINATO-KU
- **CITY:** TOKYO
- **STATE:** M0
- **ZIP:** 105-7537

**FORMER NAME:**
- **FORMER CONFORMED NAME:** SOFTBANK GROUP CORP
- **DATE OF NAME CHANGE:** 20150702

**FORMER NAME:**
- **FORMER CONFORMED NAME:** SOFTBANK CORP
- **DATE OF NAME CHANGE:** 19980708
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ARM HOLDINGS PLC /UK
- **CENTRAL INDEX KEY:** 0001973239
- **STANDARD INDUSTRIAL CLASSIFICATION:** SEMICONDUCTORS & RELATED DEVICES [3674]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 000000000
- **STATE OF INCORPORATION:** X0
- **FISCAL YEAR END:** 0331

**BUSINESS ADDRESS:**
- **STREET 1:** 110 FULBOURN ROAD
- **CITY:** CAMBRIDGE
- **STATE:** X0
- **ZIP:** CB1 9NJ
- **BUSINESS PHONE:** 44 1223 400 400

**MAIL ADDRESS:**
- **STREET 1:** 110 FULBOURN ROAD
- **CITY:** CAMBRIDGE
- **STATE:** X0
- **ZIP:** CB1 9NJ

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Arm Holdings Ltd
- **DATE OF NAME CHANGE:** 20230411

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>SOFTBANK GROUP CORP.<br><sub>(Last) (First) (Middle)</sub><br>1-7-1 Kaigan<br>Minato-ku<br><sub>(Street)</sub><br>Tokyo,  105-7537<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>ARM HOLDINGS PLC /UK [ ARM ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-03-18 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director   [X] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Ordinary Shares<sup>(1)</sup> | 922733999 | I | By limited liability company<sup>(2)</sup> |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) 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.

(2) 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.

**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.

**Signature:** SoftBank Group Corp., By: /s/ Yuko Yamamoto, Head of Corporate Legal Department  
**Date:** 2026-03-18

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**