Arm (ARM) CEO Rene Haas discloses 314,832-share ownership in Form 3

Rhea-AI Filing Summary

ARM Holdings director and Chief Executive Officer Rene A. Haas has filed an initial ownership report showing he holds 314,832 Ordinary Shares of the company. These Ordinary Shares have a nominal value of 0.001 GBP per share and are held in the form of American Depositary Shares, with each ADS representing one Ordinary Share.

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^*

Haas Rene A.

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive 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)	314,832	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

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.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ George Kanelos, as Attorney-in-Fact for Rene A. Haas	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 insider position did ARM (ARM) CEO Rene Haas report on this Form 3?

Rene A. Haas, Chief Executive Officer and director of ARM, reported beneficial ownership of 314,832 Ordinary Shares. This Form 3 is an initial ownership statement and does not reflect a new purchase or sale, only his existing equity stake in the company.

Are Rene Haas’s ARM (ARM) holdings in ordinary shares or ADSs?

Rene Haas’s reported holdings are Ordinary Shares of ARM, each with a nominal value of 0.001 GBP. According to the disclosure, these Ordinary Shares are held in the form of American Depositary Shares (ADSs), with each ADS representing one Ordinary Share.

Does this ARM (ARM) Form 3 show any insider buying or selling by Rene Haas?

No, this Form 3 does not show insider buying or selling. It records Rene Haas’s existing ownership of 314,832 Ordinary Shares as his initial beneficial ownership report, without reporting any new transactions or changes in his position.

How many ARM (ARM) shares does CEO Rene Haas beneficially own?

CEO Rene A. Haas beneficially owns 314,832 Ordinary Shares of ARM. These shares are held as American Depositary Shares on a one-for-one basis with the underlying Ordinary Shares, providing direct equity exposure to the company’s stock.

What is the ADS to Ordinary Share ratio for ARM (ARM) in this filing?

The filing states that each American Depositary Share (ADS) represents one Ordinary Share of ARM, with a nominal value of 0.001 GBP per share. This one-to-one ratio links the ADSs directly to the underlying Ordinary Shares reported by Rene Haas.