Arm Holdings (ARM) CPO details initial RSU and share holdings

Rhea-AI Filing Summary

Arm Holdings plc Chief People Officer Charlotte Claire Eaton filed an initial ownership report showing direct holdings of restricted stock units and ordinary shares. The RSUs correspond to 90,012, 7,336 and 20,313 Ordinary Shares, and she also directly holds 10,765 Ordinary Shares, all in the form of ADSs. The RSU grants vest between 2026 and 2028 in annual or staged installments, subject to continued service.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider Eaton Charlotte Claire

Role Chief People Officer

Type	Security	Shares	Price	Value
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Ordinary Shares	--	--	--

Holdings After Transaction: Restricted Stock Units — 90,012 shares (Direct); Ordinary Shares — 10,765 shares (Direct)

Footnotes (1)

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. This restricted stock unit ("RSU") award was granted on December 9, 2025. 30% will vest on each of November 15, 2026 and November 15, 2027, and the remaining 40% will vest on November 15, 2028, subject to continued service to Arm Holdings plc (the "Company"). Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS. This RSU award was granted on May 1, 2025. 30% will vest on each of May 15, 2026, and May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company. The RSU award was granted on December 12, 2024, and vests annually. The remaining unvested RSUs will vest on November 15, 2026, and November 15, 2027 in equal installements, subject to the terms and conditions of the award agreement, including continued service to the Company.

Understanding Insider Trading Forms →

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
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1. Name and Address of Reporting Person^*

Eaton Charlotte Claire

(Last) (First) (Middle)

C/O ARM HOLDINGS PLC

110 FULBOURN ROAD

(Street)

CAMBRIDGE CB1 9NJ

(City) (State) (Zip)

UNITED KINGDOM

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
ARM HOLDINGS PLC /UK [ ARM ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief People Officer

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary Shares(1)	10,765	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(2)	(2)	Ordinary Shares(1)	90,012	(3)	D
Restricted Stock Units	(4)	(4)	Ordinary Shares(1)	7,336	(3)	D
Restricted Stock Units	(5)	(5)	Ordinary Shares(1)	20,313	(3)	D

Explanation of Responses:

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. This restricted stock unit ("RSU") award was granted on December 9, 2025. 30% will vest on each of November 15, 2026 and November 15, 2027, and the remaining 40% will vest on November 15, 2028, subject to continued service to Arm Holdings plc (the "Company").

3. Each 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% will vest on each of May 15, 2026, and May 15, 2027, and the remaining 40% will vest on May 15, 2028, subject to continued service to the Company.

5. The RSU award was granted on December 12, 2024, and vests annually. The remaining unvested RSUs will vest on November 15, 2026, and November 15, 2027 in equal installements, subject to the terms and conditions of the award agreement, including continued service to the Company.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ George Kanelos, as Attorney-in-Fact for Charlotte Claire Eaton	03/18/2026
	** Signature of Reporting Person	Date
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 5 (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.
* Form 3: SEC 1473 (03-26)

FAQ

What does Arm (ARM) Chief People Officer Charlotte Claire Eaton report on this Form 3?

Charlotte Claire Eaton reports her initial ownership in Arm Holdings plc, including several restricted stock unit awards and a block of ordinary shares. These holdings are reported as direct ownership and are tied to her role as Chief People Officer.

How many Arm (ARM) ordinary shares are linked to Charlotte Eaton’s RSUs?

The filing lists three RSU awards linked to 90,012, 7,336 and 20,313 underlying Ordinary Shares. Each RSU represents the right to receive one Ordinary Share, which is held in the form of an American Depositary Share (ADS) after vesting.

How many Arm (ARM) ordinary shares does Charlotte Eaton hold directly?

In addition to RSUs, Charlotte Claire Eaton reports direct ownership of 10,765 Ordinary Shares. According to the filing, these Ordinary Shares are held in the form of American Depositary Shares, with each ADS representing one Ordinary Share.

What are the vesting schedules for Charlotte Eaton’s Arm (ARM) RSU awards?

One RSU grant from December 9, 2025 vests 30% on November 15, 2026, 30% on November 15, 2027 and 40% on November 15, 2028. Another, granted May 1, 2025, follows a similar 30/30/40 schedule through 2028.

How do Charlotte Eaton’s earlier Arm (ARM) RSUs vest over time?

An RSU award granted on December 12, 2024 vests annually. The remaining unvested RSUs from this grant will vest in equal installments on November 15, 2026 and November 15, 2027, subject to the award terms and continued service to Arm.

What is the relationship between Arm (ARM) ADSs and ordinary shares in this filing?

The filing states that Arm’s Ordinary Shares are held as American Depositary Shares (ADSs). Each ADS represents one Ordinary Share, so reported share and RSU amounts translate one-for-one into ADSs upon settlement.