Arm Holdings (ARM) CAO reports Ordinary Share and RSU stakes

Rhea-AI Filing Summary

Arm Holdings plc Chief Accounting Officer Laura Kathleen Bartels filed an initial ownership report showing her equity stake in the company. She directly holds 20,066 Ordinary Shares, which are represented by American Depositary Shares, with each ADS equal to 1 Ordinary Share.

She also holds several restricted stock unit (RSU) awards, each RSU representing the right to receive 1 Ordinary Share in ADS form after vesting. These include awards originally granted on May 22, 2023, May 13, 2024, and May 1, 2025, with vesting schedules where 28.5% vests on initial vest dates and 6.5% vests quarterly thereafter until full vesting in May 2026, February 2028, and February 2029, respectively.

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

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1. Name and Address of Reporting Person^*

Bartels Laura Kathleen

(Last) (First) (Middle)

C/O ARM HOLDINGS PLC

110 FULBOURN ROAD

(Street)

CAMBRIDGE CB1 9NJ

(City) (State) (Zip)

UNITED STATES

(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 Accounting 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)	20,066	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)	12,592	(3)	D
Restricted Stock Units	(4)	(4)	Ordinary Shares(1)	6,895	(3)	D
Restricted Stock Units	(5)	(5)	Ordinary Shares(1)	2,308	(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 May 1, 2025, 28.5% of which will vest on May 15, 2026, with quarterly vesting of 6.5% thereafter with 100% of the award fully vested on February 15, 2029.

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 13, 2024, 28.5% of which vested on May 15, 2025, with quarterly vesting of 6.5% thereafter with 100% of the award fully vested on February 15, 2028. The number in the table represents the total remaining unvested RSUs as of March 18, 2025.

5. This RSU award was granted on May 22, 2023, 28.5% of which vested on May 15, 2024, with quarterly vesting of 6.5% thereafter with 100% of the award fully vested on May 15, 2026. The number in the table represents the total remaining unvested RSUs as of March 18, 2025.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ George Kanelos, as Attorney-in-Fact for Laura Kathleen Bartels	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 the Arm (ARM) Form 3 filing by Laura Kathleen Bartels show?

The Form 3 shows Chief Accounting Officer Laura Kathleen Bartels’ initial equity holdings in Arm. It lists her directly held Ordinary Shares and multiple restricted stock unit awards, including their grant dates, vesting schedules, and remaining unvested RSUs as of March 18, 2025.

How many Arm (ARM) Ordinary Shares does Laura Kathleen Bartels directly hold?

Laura Kathleen Bartels directly holds 20,066 Arm Ordinary Shares. These Ordinary Shares are held in the form of American Depositary Shares, with each ADS representing one Ordinary Share, according to the filing’s footnote describing the company’s share structure.

What restricted stock unit awards are reported for Arm (ARM) CAO Laura Kathleen Bartels?

The filing reports three RSU awards granted in 2023, 2024, and 2025. Each award consists of RSUs that convert into Ordinary Shares in ADS form upon vesting, with detailed vesting schedules specifying initial 28.5% vesting and subsequent 6.5% quarterly vesting.

How do the Arm (ARM) RSU vesting schedules work for Laura Kathleen Bartels?

Each RSU grant vests 28.5% on a specified initial vest date, then 6.5% vests quarterly. The 2023 grant fully vests by May 15, 2026, the 2024 grant by February 15, 2028, and the 2025 grant by February 15, 2029, if service conditions are met.

What does the Arm (ARM) filing say about RSUs and Ordinary Shares?

The filing explains that each restricted stock unit represents the right to receive one Ordinary Share held as an American Depositary Share after vesting. It clarifies that Ordinary Shares have a nominal value of 0.001 GBP and that each ADS equals one Ordinary Share.

Are the RSU amounts in the Arm (ARM) Form 3 fully vested for Laura Kathleen Bartels?

No, the filing notes that some RSU figures represent remaining unvested units as of March 18, 2025. Footnotes for the 2023 and 2024 grants explicitly state the tabled numbers are the total remaining unvested RSUs under those awards on that date.