Arm Holdings (ARM) director Young Sohn reports insider equity holdings

Rhea-AI Filing Summary

Arm Holdings plc director Young Sohn reported his initial equity position as a company insider. He holds 684 Ordinary Shares directly, plus 2,141 restricted stock units, each representing one Ordinary Share held as an American Depositary Share. These RSUs are scheduled to vest in full on May 15, 2026, subject to his continued service.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider SOHN YOUNG

Role Director

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

Holdings After Transaction: Restricted Stock Units — 2,141 shares (Direct); Ordinary Shares — 684 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. The restricted stock units ("RSUs") will vest in full on May 15, 2026, subject to continued service to Arm Holdings plc. Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

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^*

SOHN YOUNG

(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
	Officer (give title below)		Other (specify below)

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)	684	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)	2,141	(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. The restricted stock units ("RSUs") will vest in full on May 15, 2026, subject to continued service to Arm Holdings plc.

3. Each RSU represents the right to receive, following vesting, 1 Ordinary Share held in the form of an ADS.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ George Kanelos, as Attorney-in-Fact for Young Sohn	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 Young Sohn Form 3 filing show for ARM?

The Form 3 shows that director Young Sohn holds 684 Ordinary Shares of Arm Holdings plc and 2,141 restricted stock units that convert into Ordinary Shares held as ADSs after vesting.

How many Arm Holdings (ARM) RSUs does Young Sohn report on his Form 3?

Young Sohn reports 2,141 restricted stock units tied to Arm Holdings plc. Each RSU represents the right to receive one Ordinary Share in the form of an American Depositary Share once the units vest.

When do Young Sohn’s Arm Holdings (ARM) RSUs vest?

Young Sohn’s restricted stock units in Arm Holdings plc will vest in full on May 15, 2026, provided he continues to serve the company through that date, according to the filing footnotes.

What Ordinary Share holdings does Young Sohn report in Arm Holdings (ARM)?

Young Sohn reports direct ownership of 684 Ordinary Shares of Arm Holdings plc. These are separate from his 2,141 restricted stock units, which will convert into additional Ordinary Shares after vesting.

How are Arm Holdings (ARM) Ordinary Shares held according to Young Sohn’s Form 3?

The filing states Arm Holdings plc Ordinary Shares are held in the form of American Depositary Shares (ADSs). Each ADS represents one Ordinary Share, so RSUs ultimately deliver ADSs equal to the underlying shares.