# EDGAR Filing Document

**Accession Number:** 0002112445
**File Stem:** 0001973239-26-000076
**Filing Date:** 2026-5
**Character Count:** 9811
**Document Hash:** a594122187b91b7281d40a2167446a1a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001973239-26-000076.hdr.sgml**: 20260519

**ACCESSION NUMBER**: 0001973239-26-000076

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260515

**FILED AS OF DATE**: 20260519

**DATE AS OF CHANGE**: 20260519

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Grisenthwaite Richard Roy
- **CENTRAL INDEX KEY:** 0002112445

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41800
- **FILM NUMBER:** 261000369

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** 110 FULBOURN RD
- **CITY:** CAMBRIDGE
- **PROVINCE COUNTRY:** X0
- **ZIP:** UK CB1 9NJ
**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 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Grisenthwaite Richard Roy<br><sub>(Last) (First) (Middle)</sub><br>C/O ARM HOLDINGS PLC<br>110 FULBOURN ROAD<br><sub>(Street)</sub><br>CAMBRIDGE, UNITED KINGDOM CB1 9NJ<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-05-15 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_Chief Architect_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>ARM HOLDINGS PLC /UK [ ARM ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<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

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Ordinary Shares<sup>(1)</sup> | 2026-05-15 |  | A |  | 5217<sup>(2)</sup> | A | <sup>(3)</sup> | 5543 | D |  |
| Ordinary Shares<sup>(1)</sup> | 2026-05-15 |  | M |  | 2046<sup>(4)</sup> | A | <sup>(3)</sup> | 7589 | D |  |
| Ordinary Shares<sup>(1)</sup> | 2026-05-15 |  | M |  | 14595<sup>(4)</sup> | A | <sup>(3)</sup> | 22184 | D |  |
| Ordinary Shares<sup>(1)</sup> | 2026-05-15 |  | A |  | 4158<sup>(5)</sup> | A | <sup>(3)</sup> | 26342 | D |  |
| Ordinary Shares<sup>(1)</sup> | 2026-05-15 |  | M |  | 1631<sup>(6)</sup> | A | <sup>(3)</sup> | 27973 | D |  |
| Ordinary Shares<sup>(1)</sup> | 2026-05-15 |  | A |  | 13315<sup>(7)</sup> | A | <sup>(3)</sup> | 41288 | D |  |
| Ordinary Shares<sup>(1)</sup> | 2026-05-15 |  | M |  | 4352<sup>(8)</sup> | A | <sup>(3)</sup> | 45640 | D |  |
| Ordinary Shares<sup>(1)</sup> | 2026-05-15 |  | F<sup>(9)</sup> |  | 21301 | D | $209.16 | 24339 | D |  |
| Ordinary Shares<sup>(1)</sup> | 2026-05-18 |  | S |  | 24339 | D | 209.15<sup>(10)</sup> | 0 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Restricted Stock Units | <sup>(3)</sup> | 2026-05-15 |  | A |  | 6648 |  | <sup>(11)</sup> | <sup>(11)</sup> | Ordinary Shares | 6648 | $0 | 106282 | D |  |
| Restricted Stock Units | <sup>(3)</sup> | 2026-05-15 |  | A |  | 34785 |  | <sup>(12)</sup> | <sup>(12)</sup> | Ordinary Shares | 34785 | $0 | 141067 | D |  |
| Restricted Stock Units | <sup>(3)</sup> | 2026-05-15 |  | M |  |  | 2046 | <sup>(4)</sup> | <sup>(4)</sup> | Ordinary Shares | 2046 | $0 | 139021 | D |  |
| Restricted Stock Units | <sup>(3)</sup> | 2026-05-15 |  | M |  |  | 14595 | <sup>(4)</sup> | <sup>(4)</sup> | Ordinary Shares | 14595 | $0 | 124426 | D |  |
| Restricted Stock Units | <sup>(3)</sup> | 2026-05-15 |  | M |  |  | 1631 | <sup>(6)</sup> | <sup>(6)</sup> | Ordinary Shares | 1631 | $0 | 122795 | D |  |
| Restricted Stock Units | <sup>(3)</sup> | 2026-05-15 |  | M |  |  | 4352 | <sup>(8)</sup> | <sup>(8)</sup> | Ordinary Shares | 4352 | $0 | 118443 | D |  |

---

### Footnotes:

(1) 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.

(2) Represents performance-based restricted stock units granted on May 1, 2025, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee (the "Remuneration Committee") of the Board of Directors of the Company.

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

(4) This RSU award was granted on May 1, 2025. 30% of the award vested on May 15, 2026. 30% of the award will vest on May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

(5) Represents performance-based RSUs granted on May 13, 2024, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee.

(6) This RSU award was granted on May 13, 2024, 30% of which vested on each of May 15, 2025 and May 15, 2026. The remaining 40% will vest on May 15, 2027, subject to continued service to the Company.

(7) Represents performance-based RSUs granted on May 23, 2023, which vested on May 15, 2026, following certification of the satisfaction of certain performance conditions by the Remuneration Committee.

(8) This RSU award was granted on May 23, 2023 and vested on May 15, 2026.

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

(10) Represents weighted average sales price. The shares were sold at prices ranging from $209.03 to $209.66. The reporting person will provide upon request, to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price

(11) This RSU award was granted effective May 15, 2026. 30% will vest on each of May 15, 2027, and May 15, 2028, and the remaining 40% will vest on May 15, 2029, subject to continued service to the Company.

(12) This RSU award was granted effective May 15, 2026. 50%  will vest on each of May 15, 2028 and May 15, 2029, subject to continued service to the Company.

**Signature:** /s/ George Kanelos, as Attorney-in-Fact for Richard Roy Grisenthwaite  
**Date:** 2026-05-19

### 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.**